Cannot resolve symbol: symbol: method getContentPane()
ok, here is my code, why am I getting this error??
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.util.*;
public class Jsmileface extends Applet implements ActionListener
JButton pressButton = new JButton("Press Me");
private AudioClip sound;
public void init()
sound = getAudioClip(getCodeBase(), "HaveANiceDay.wav");
Container con = getContentPane();
con.setLayout(new FlowLayout());
con.add(pressButton);
pressButton.addActionListener(this);
public void paint(Graphics g)
g.setColor(Color.yellow);
g.fillOval(50,50,100,100);
g.setColor(Color.black);
g.fillOval(75,75,10,10);
g.fillOval(100,75,10,10);
g.drawArc(75,75,50,50,200,140);
public void start()
sound.loop();
public void stop ()
sound.stop();
public void actionPerformed(ActionEvent r)
Object source = r.getSource();
if (source == pressButton)
repaint();
}
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Jsmileface extends JApplet implements ActionListener{
JButton pressButton = new JButton("Press Me");
private java.applet.AudioClip sound;
private String str = "";
public void init(){
sound = getAudioClip(getCodeBase(), "HaveANiceDay.au");
Container con = getContentPane();
con.setLayout(new FlowLayout());
JPanel pan = new JPanel();
pan.add(pressButton);
con.add(pan);
pressButton.addActionListener(this);
sound.loop();
public void paint(Graphics g) {
g.setColor(Color.yellow);
g.fillOval(50,50,100,100);
g.setColor(Color.black);
g.drawString(str,60,170);
g.fillOval(75,75,10,10);
g.fillOval(100,75,10,10);
g.drawArc(75,75,50,50,200,140);
public void destroy(){
sound.stop();
public void actionPerformed(ActionEvent r){
Object source = r.getSource();
if (source == pressButton){
str = "Button pressed";
repaint();
}
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Cannot resolve symbol: method getCodeBase ()
I`m creating a dice game that makes a sound when player wins or looses. Instaed I`m getting the following error message: Cannot resolve symbol: method getCodeBase (). I think this depends on the fact that I have a separate applet launcher but cannot figure out how to solve this, please help!!
This is the applet launcher
import javax.swing.*;
import java.awt.*;
// [MC] Public class DiceApplet
public class DiceApplet extends JApplet
// [MC] Constructor.
public DiceApplet()
// [MC] Sets the contentPane property. This method is called by the constructor.
this.setContentPane(new DicePanel());
This is the die class
import java.awt.*;
import javax.swing.*;
// [MC] Public class Die
public class Die extends JPanel
// ======================================================================
// [MC] Instance variable.
private int myFaceValue; // [MC] Value that shows on face of die.
// [MC] End instance variable.
// ======================================================================
// [MC] Constructor.
// [MC] Initialises die to blue background and initial roll.
public Die()
// [MC] Sets the background colour of the die to blue.
setBackground(Color.blue);
// [MC] Sets the foreground colour of the die to gray.
setForeground(Color.gray);
// [MC] Sets the border colour of the die to white.
setBorder(BorderFactory.createMatteBorder(4, 4, 4, 4, Color.white));
// [MC] Sets to random initial value.
roll();
} // [MC] End constructor.
// ======================================================================
// [MC] Method roll.
// [MC] Produces random roll in the range of 1 to 6.
public int roll()
int val = (int)(6*Math.random() + 1); // [MC] Range from 1 to 6.
setValue(val);
return val; // [MC] Returns a value from 1 to 6.
} // [MC] End method roll.
// [MC] Method setValue
// [MC] Sets the value of the die. Causes repaint.
public void setValue(int dots)
myFaceValue = dots;
repaint(); // [MC] Value has changed, must repaint.
} // [MC] End method setValue.
// ======================================================================
// [MC] Method getValue.
// [MC] Returns result of last roll.
public int getValue()
return myFaceValue;
} // [MC] End method getValue.
// ======================================================================
// [MC] Method paintComponent.
// [MC] Draws dots of die face.
public void paintComponent(Graphics g)
// [MC] Call superclass's paint method.
super.paintComponent(g);
// [MC] Sets panel width.
int w = getWidth();
// [MC] Sets panel height.
int h = getHeight();
// [MC] Draws border.
g.drawRect(0, 0, w-1, h-1);
// Switch
switch (myFaceValue)
case 1: drawDot(g, w/2, h/2);
break;
case 3: drawDot(g, w/2, h/2);
case 2: drawDot(g, w/4, h/4);
drawDot(g, 3*w/4, 3*h/4);
break;
case 5: drawDot(g, w/2, h/2);
case 4: drawDot(g, w/4, h/4);
drawDot(g, 3*w/4, 3*h/4);
drawDot(g, 3*w/4, h/4);
drawDot(g, w/4, 3*h/4);
break;
case 6: drawDot(g, w/4, h/4);
drawDot(g, 3*w/4, 3*h/4);
drawDot(g, 3*w/4, h/4);
drawDot(g, w/4, 3*h/4);
drawDot(g, w/4, h/2);
drawDot(g, 3*w/4, h/2);
break;
} // [MC] End switch.
} // [MC] End method paintComponent.
// [MC] Method drawDot.
/** Utility method used by paintComponent(). */
private void drawDot(Graphics g, int x, int y)
// [MC] Gets panel width.
int w = getWidth();
// [MC] Gets panel height.
int h = getHeight();
// [MC] Local variable.
int d;
// [MC] Sets diameter of dot proportional to panel size.
d = (w + h)/10;
// [MC] Sets colour for dot to white.
Color myDotColor = new Color(255, 255, 255);
g.setColor(myDotColor);
// [MC] Draws dot.
g.fillOval(x-d/2, y-d/2, d, d);
} // [MC] End method drawDot.
This is the class giving the error message
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import java.applet.AudioClip;
import java.applet.Applet;
import java.net.*;
// [MC] Public class DicePanel
public class DicePanel extends JPanel
// ======================================================================
// [MC] Instance variables.
// [MC] Creates new instances of the component for the die.
private Die myLeftDie; // [MC] Component for left die.
private Die myRightDie; // [MC] Component for right die.
// [MC] Creates the button (rollButton) to roll the dice.
private JButton rollButton = new JButton("Roll Dice");
// [MC] Creates the text fields. Creates new instance of JTextField.
// [MC] Creates the text field (rollNumberTextField) to display number of rolls.
private JTextField rollNumberTextField = new JTextField(20);
// [MC] Creates the text field (rollResultTextField) to display result of roll.
private JTextField rollResultTextField = new JTextField(20);
// [MC] Creates the text field (rollPointsTextField) to display the player`s points.
private JTextField rollPointsTextField = new JTextField(20);
// [MC] Creates the text field (gameFinalResultTextField) to display the final game result.
private JTextField gameFinalResultTextField = new JTextField(20);
// [MC] Initialises instance variables declared in the inner listeners.
private int result = 0, resultLeft = 0, resultRight = 0;
private int rolls = 0;
private int finalResult = 0;
private int points = 0;
private boolean first = true;
private AudioClip winClip = null;
private AudioClip looseClip = null;
// ======================================================================
// [MC] Constructor. Creates border layout panel.
DicePanel()
// [MC] Creates the dice
myLeftDie = new Die();
myRightDie = new Die();
// ======================================================================
// [MC] Creates the buttons.
// [MC] Creates the button (newGameButton) to start new game.
JButton newGameButton = new JButton("New Game");
// *[MC] Creates the button (rollButton) to roll the dice.
// *JButton rollButton = new JButton("Roll Dice");
// [MC] Sets the font of the buttons.
// [MC[ Sets the font of the button newGameButton.
newGameButton.setFont(new Font("Batang", Font.BOLD, 20));
// [MC[ Sets the font of the button rollButton.
rollButton.setFont(new Font("Batang", Font.BOLD, 20));
// [MC] Sets the button border format.
// [MC] Sets the button with compound borders.
Border compound;
// [MC] Border format local variables.
Border blackline, raisedetched, loweredetched, raisedbevel, loweredbevel, empty;
// [MC] Initialises border formats.
//blackline = BorderFactory.createLineBorder(Color.gray);
raisedetched = BorderFactory.createEtchedBorder(EtchedBorder.RAISED);
loweredetched = BorderFactory.createEtchedBorder(EtchedBorder.LOWERED);
raisedbevel = BorderFactory.createRaisedBevelBorder();
//loweredbevel = BorderFactory.createLoweredBevelBorder();
// [MC] Sets compound border format.
compound = BorderFactory.createCompoundBorder(raisedetched, raisedbevel);
// [MC] Sets the button (newGameButton) with compound border format.
newGameButton.setBorder(compound);
// [MC] Sets the button (rollButton) with compound border format.
rollButton.setBorder(compound);
// [MC] Adds listener.
// [MC] Adds listener to rollButton.
rollButton.addActionListener(new RollListener());
// [MC] Adds listener to newGameButton.
newGameButton.addActionListener(new NewGameListener());
// ======================================================================
// [MC] Creates the labels. Creates new instance of JLabel.
// [MC] Creates the label (rollNumberLabel) for the number of rolls.
JLabel rollNumberLabel = new JLabel("Roll Number");
// [MC] Creates the label (rollResultLabel) for the result of roll.
JLabel rollResultLabel = new JLabel("Roll Result");
// [MC] Creates the label (rollPointsLabel) for the player`s points.
JLabel rollPointsLabel = new JLabel("Player Points");
// [MC] Creates the label (gameFinalResult) for the final game result.
JLabel gameFinalResultLabel = new JLabel("Final Result");
// [MC] Sets the label font.
rollNumberLabel.setFont(new Font("Sansserif", Font.PLAIN, 10));
rollResultLabel.setFont(new Font("Sansserif", Font.PLAIN, 10));
rollPointsLabel.setFont(new Font("Sansserif", Font.PLAIN, 10));
gameFinalResultLabel.setFont(new Font("Sansserif", Font.PLAIN, 10));
// [MC] Sets the label title alignment.
rollNumberLabel.setHorizontalAlignment(JLabel.CENTER);
rollResultLabel.setHorizontalAlignment(JLabel.CENTER);
rollPointsLabel.setHorizontalAlignment(JLabel.CENTER);
gameFinalResultLabel.setHorizontalAlignment(JLabel.CENTER);
// [MC] Sets the label border format.
//rollNumberLabel.setBorder(loweredetched);
//rollResultLabel.setBorder(loweredetched);
//rollPointsLabel.setBorder(loweredetched);
//gameFinalResultLabel.setBorder(loweredetched);
// ======================================================================
// [MC] Sets the text field font.
rollNumberTextField.setFont(new Font("Sansserif", Font.PLAIN, 16));
rollResultTextField.setFont(new Font("Sansserif", Font.PLAIN, 16));
rollPointsTextField.setFont(new Font("Sansserif", Font.PLAIN, 16));
gameFinalResultTextField.setFont(new Font("Sansserif", Font.BOLD, 16));
// [MC] Sets the text field text alignment.
rollNumberTextField.setHorizontalAlignment(JTextField.CENTER);
rollResultTextField.setHorizontalAlignment(JTextField.CENTER);
rollPointsTextField.setHorizontalAlignment(JTextField.CENTER);
gameFinalResultTextField.setHorizontalAlignment(JTextField.CENTER);
// [MC] Sets the text field text colour.
gameFinalResultTextField.setForeground(Color.blue);
// [MC] Sets the text field to not editable.
rollNumberTextField.setEditable(false);
rollResultTextField.setEditable(false);
rollPointsTextField.setEditable(false);
gameFinalResultTextField.setEditable(false);
// ======================================================================
// [MC] Gets sounds.
winClip = getAudioClip(getCodeBase(), "bunny1.au");
looseClip = getAudioClip(getCodeBase(), "bunny1.au");
// ======================================================================
// [MC] Sets the layout manager (GridBagLayout) for this container.
this.setLayout(new GridBagLayout());
// [MC] Creates new instance of GridBagConstraints.
GridBagConstraints c = new GridBagConstraints();
// [MC] Makes the component fill its display area entirely.
c.fill = GridBagConstraints.BOTH;
// [MC] Layouts components.
// [MC] Adds the component newGameButton to this container.
c.gridx = 0; // [MC] Makes this component the leftmost column (column 1).
c.gridy = 0; // [MC] Makes this component the uppermost row (row 1).
c.gridheight = 1; // [MC] Specifies the number of rows the component uses (1 row).
c.gridwidth = 2; // [MC] Specifies the number of columns the component uses (2 columns).
this.add(newGameButton, c); // [MC] Adds the button newGameButton.
// [MC] Adds the component rollButton to this container.
c.gridx = 2; // [MC] Makes this component the third column from left (column 3).
c.gridy = 0; // [MC] Make this component the uppermost row (row 1).
c.gridheight = 1; // [MC] Specifies the number of rows the component uses (1 rows).
c.gridwidth = 2; // [MC] Specifies the number of columns the component uses (2 columns).
this.add(rollButton, c); // [MC] Adds the button rollButton.
// [MC] Adds the component rollNumberLabel to this container.
c.gridx = 0; // [MC] Makes this component the leftmost column (column 1).
c.gridy = 3; // [MC] Makes this component the third row from top (row 3).
c.gridheight = 1; // [MC] Specifies the number of rows the component uses (1 row).
c.gridwidth = 1; // [MC] Specifies the number of columns the component uses (1 column).
c.weightx = 0.1; // [MC] Requests any extra vertical (column) space.
this.add(rollNumberLabel, c); // [MC] Adds the label rollNumberLabel.
// [MC] Adds the component rollResultLabel to this container.
c.gridx = 1; // [MC] Makes this component the second column from left (column 2).
c.gridy = 3; // [MC] Makes this component the third row from top (row 3).
c.gridheight = 1; // [MC] Specifies the number of rows the component uses (1 row).
c.gridwidth = 1; // [MC] Specifies the number of columns the component uses (1 column).
this.add(rollResultLabel, c); // [MC] Adds the label rollResultLabel.
// [MC] Adds the component rollPointsLabel to this container.
c.gridx = 2; // [MC] Makes this component the third column from left (column 3).
c.gridy = 3; // [MC] Makes this component the third row from top (row 3).
c.gridheight = 1; // [MC] Specifies the number of rows the component uses (1 row).
c.gridwidth = 1; // [MC] Specifies the number of columns the component uses (1 column).
this.add(rollPointsLabel, c); // [MC] Adds the label rollPointsLabel.
// [MC] Adds the component gameFinalResultLabel to this container.
c.gridx = 3; // [MC] Makes this component the fourth column from left (column 4).
c.gridy = 3; // [MC] Makes this component the third row from top (row 3).
c.gridheight = 1; // [MC] Specifies the number of rows the component uses (1 row).
c.gridwidth = 1; // [MC] Specifies the number of columns the component uses (1 column).
this.add(gameFinalResultLabel, c); // [MC] Adds the label gameFinalResultLabel.
// [MC] Adds the component rollNumberTextField to this container.
c.gridx = 0; // [MC] Makes this component the leftmost column (column 1).
c.gridy = 4; // [MC] Makes this component the fourth row from top (row 4).
c.gridheight = 1; // [MC] Specifies the number of rows the component uses (1 row).
c.gridwidth = 1; // [MC] Specifies the number of columns the component uses (1 column).
c.weightx = 0.1; // [MC] Requests any extra vertical (column) space.
this.add(rollNumberTextField, c); // [MC] Adds the text field rollNumberTextField.
// [MC] Adds the component rollResultTextField to this container.
c.gridx = 1; // [MC] Makes this component the second column from left (column 2).
c.gridy = 4; // [MC] Makes this component the fourth row from top (row 4).
c.gridheight = 1; // [MC] Specifies the number of rows the component uses (1 row).
c.gridwidth = 1; // [MC] Specifies the number of columns the component uses (1 column).
this.add(rollResultTextField, c); // [MC] Adds the text field rollResultTextField.
// [MC] Adds the component rollPointsTextField to this container.
c.gridx = 2; // [MC] Makes this component the third column from left (column 3).
c.gridy = 4; // [MC] Makes this component the fourth row from top (row 4).
c.gridheight = 1; // [MC] Specifies the number of rows the component uses (1 row).
c.gridwidth = 1; // [MC] Specifies the number of columns the component uses (1 column).
this.add(rollPointsTextField, c); // [MC] Adds the text field rollPointsTextField.
// [MC] Adds the component gameFinalResultTextField to this container.
c.gridx = 3; // [MC] Makes this component the fourth column from left (column 4).
c.gridy = 4; // [MC] Makes this component the fourth row from top (row 4).
c.gridheight = 1; // [MC] Specifies the number of rows the component uses (1 row).
c.gridwidth = 1; // [MC] Specifies the number of columns the component uses (1 column).
this.add(gameFinalResultTextField, c); // [MC] Adds the text field gameFinalResultTextField.
// [MC] Adds the component myLeftDie to this container.
c.gridx = 0; // [MC] Makes this component the leftmost column (column 1).
c.gridy = 1; // [MC] Makes this component the second row from top (row 2).
c.gridheight = 2; // [MC] Specifies the number of rows the component uses (2 rows).
c.gridwidth = 2; // [MC] Specifies the number of columns the component uses (2 columns).
c.weightx = 1.0; // [MC] Requests any extra vertical (column) space.
c.weighty = 1.0; // [MC] Requests any extra horizontal (row) space.
this.add(myLeftDie, c); // [MC] Adds the component myLeftDie.
// [MC] Adds the component myRightDie to this container.
c.gridx = 2; // [MC] Makes this component the third column from left (column 3).
c.gridy = 1; // [MC] Makes this component the second row from top (row 2).
c.gridheight = 2; // [MC] Specifies the number of rows the component uses (2 rows).
c.gridwidth = 2; // [MC] Specifies the number of columns the component uses (2 column).
c.weightx = 1.0; // [MC] Requests any extra column (vertical) space.
c.weighty = 1.0; // [MC] Requests any extra horizontal (row) space.
this.add(myRightDie, c); // [MC] Adds the component myRightDie.
} // [MC] end constructor
// ======================================================================
// [MC] Private class RollListener
// [MC] Inner listener class for rollButton.
private class RollListener implements ActionListener
public void actionPerformed(ActionEvent e)
// [MC] Rolls the dice.
myLeftDie.roll(); // [MC] Rolls left die.
myRightDie.roll(); // [MC] Rolls right die.
finalResult = 0; // [MC] If result = 0 then game is not over.
rolls++; // [MC] Increments the number of rolls.
// [MC] Displays the roll number.
rollNumberTextField.setText(" " + rolls + " ");
// [MC] Returns the result (number of dots) of last roll.
resultLeft = myLeftDie.getValue(); // [MC] Returns the result of the left die.
resultRight = myRightDie.getValue(); // [MC] Returns the result of the right die.
result = resultLeft + resultRight; // [MC] Returns the total result of dice.
// [MC] Displays the result of last roll.
rollResultTextField.setText(" " + result + " ");
// [MC] Sets the rules for the game.
// [MC] Sets the rules for the first roll of dice.
if (first)
// [MC] If the result is 2, 3 or 12 on the first throw, the player loses.
if (result == 2 || result == 3 || result == 12)
finalResult = 2; // [MC] If result = 2 then the player loses and the game is over.
gameFinalResultTextField.setText("LOOSE");
Toolkit.getDefaultToolkit().beep();
rollButton.setEnabled(false); // [MC] Disable rollButton.
first = true; // [MC] Game over after first roll.
// [MC] If the result is 7 or 11 on the first throw, the player wins.
else if (result == 7 || result == 11)
finalResult = 1; // [MC] If result = 1 then the player wins and the game is over.
gameFinalResultTextField.setText("WIN");
//Toolkit.getDefaultToolkit().beep();
rollButton.setEnabled(false); // [MC] Disable rollButton.
first = true; // [MC] Game over after first roll.
// [MC] If the player didn`t win or lose then the results 4, 5, 6, 8, 9 or 10 become the player`s point.
else if (result == 4 || result == 5 || result == 6 || result == 8 || result == 9 || result == 10);
// [MC] Returns the player`s points.
points = result; // [MC] Returns the player`s points.
// [MC] Displays the player`s points.
rollPointsTextField.setText(" " + points + " ");
first = false; // [MC] Game is not over after first roll.
// [MC] Sets the rules for the next rolls (from second roll onwards) of the dice.
// [MC] If the result is 7, then the player loses.
else if (result == 7)
finalResult = 2; // [MC] If result = 2 then the player loses and the game is over.
gameFinalResultTextField.setText("LOOSE");
Toolkit.getDefaultToolkit().beep();
rollButton.setEnabled(false); // [MC] Disable rollButton.
// [MC] If the result is equal to the player`s point, then the player wins.
else if (result == points)
finalResult = 1; // [MC] If result = 1 then the player wins and the game is over.
gameFinalResultTextField.setText("WIN");
winClip.play();
//Toolkit.getDefaultToolkit().beep();
rollButton.setEnabled(false); // [MC] Disable rollButton.
} // [MC] End public void actionPerformed(ActionEvent e).
} // [MC] End private class RollListener.
// ======================================================================
// [MC] Private class NewGameListener
// [MC] Inner listener class for newGameButton.
private class NewGameListener implements ActionListener
public void actionPerformed(ActionEvent e)
// [MC] Initialises instance variables.
first = true; // [MC] Initialise dice roll to first roll.
rolls = 0; // [MC] Initialises number of rolls to 0.
// [MC] Initialises text fields.
rollResultTextField.setText("");
rollNumberTextField.setText("");
rollPointsTextField.setText("");
gameFinalResultTextField.setText("");
rollButton.setEnabled(true); // [MC] Enable rollButton.
} // [MC] End public void actionPerformed(ActionEvent e).
}// [MC] End private class NewGameListener implements ActionListener.
} // [MC] End public class DicePanel extends JPanel.make a backup copy before these changes
it now compiles, but I haven't run/tested it
changed constructor to init(), extending Applet, not JApplet
// [MC] Public class DiceApplet
public class DiceApplet extends Applet
// [MC] Constructor.
public void init()
// [MC] Sets the contentPane property. This method is called by the constructor.
add(new DicePanel());
}then the 'error lines' become
winClip = ((Applet)getParent()).getAudioClip(((Applet)getParent()).getCodeBase(), "bunny1.au");
looseClip = ((Applet)getParent()).getAudioClip(((Applet)getParent()).getCodeBase(), "bunny1.au");there might be additional problems when you run/test it, but this might get you started -
Missing method body and cannot resolve symbol
I keep getting these two errors when trying to compile. I know that I need to call my fibonacci and factorial functions from the main function. Is this why I am getting the missing method body error? How do I correct this?
Am I getting the cannot resolve symbol because I have to set the num and fact to equal something?
Thanks
public class Firstassignment
public static void main(String[]args)
System.out.println();
public static void fibonacci(String[]args);
int even=1;
int odd=1;
while (odd<=100);
System.out.println(even);
int temp = even;
even = odd;
odd = odd + temp;
public static void factorial (String[]args);
for (int count=1;
count<=num;
count++);
fact = fact * count;
outputbox.printLine("Factorial of" + num + "is" + fact);Hey... :o)
the problem is that you've put semicolons at the end of the function signature, like this:
public static void fibonacci(String[]args);
}that should happen only when the function is abstract... so ur function should actually look like this:
public static void fibonacci(String[]args)
}also, i think you've missed out on the declarations (like what are fact and num??).... -
Factory method generateRandomCircle: "cannot resolve symbol"
I have written 2 classes: Point and Circle, which uses Point objects in order to create a Circle object. I have created a factory method for Point, which creates random Point objects and a for Circle, which does the same. "newRandomInstance" works fine for Point, but "generateRandomCircle" throws a "cannot resolve symbol" error. "main" is inside Point class. What's the problem?
Thanks
================================================
import java.io.*;
import java.lang.*;
import java.util.*;
public class Circle implements Cloneable
public static Circle generateRandomCircle()
int a= (int) (Math.random()* Short.MAX_VALUE);
int b= (int) (Math.random()* Short.MAX_VALUE);
Point p=new Point(a,b);
int r= (int) (Math.random()* Short.MAX_VALUE);
Circle c= new Circle(p,r);
return c;
===============================================
import java.io.*;
import java.lang.*;
import java.util.*;
public class Point implements Cloneable, Comparable
public static Point newRandomInstance()
int x = (int) (Math.random() * Short.MAX_VALUE);
int y = (int) (Math.random() * Short.MAX_VALUE);
return new Point(x,y);
public static void main (String[] args)
Circle cRandom= generateRandomCircle(); //doesn't work
System.out.println(cRandom.getCenter()+" "+ cRandom.getRadius());
Point randomP= newRandomInstance(); //works OK
randomP.printPoint();
}I tried "Circle cRandom=
Circle.generateRandomCircle(); " instead of "Circle
cRandom= generateRandomCircle();" and it worked. Why
did this happen?Because generateRandomCircle() exists in class Circle and not in class Point where your are trying to use it.
>
Function "newRandomInstance()" works either as
"Point.newRandomInstance()" or as
"newRandomInstance()", however. Why does this
controversy exist?No controversy! Your main() is contained within class Point and as such knows about everything that is declared in class Point() but nothing about what is in class Circle unless you tell it to look in class Circle. -
Cannot resolve symbol error while trying to define methods in a class
Well, I'm fairly new to java and I'm trying to write a simple program that will take user input for up to 100 die and how many sides they have and will then roll them and output the frequencies of numbers occuring. I have overloaded the constructor for the Die class to reflect different choices the user may have when initializing the Die.
Here is my code:import java.util.*;
import java.io.*;
public class Die
private final int MIN_FACES = 4;
private int numFaces;
private int i = 0;
private int faceValue;
private Die currentDie;
private BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
private String line = null;
public Die()
numFaces = 6;
faceValue = 1;
public Die (int faces)
if (faces < MIN_FACES) {
numFaces = 6;
System.out.println ("Minimum number of faces allowed is 6.");
System.out.println ("Setting faces to 6... . . . . . . . . .");
else
numFaces = faces;
faceValue = 1;
//Returns an array of Die Objects
public Die (int num_die, int faces)
numFaces = faces;
Die[] protoDie = new Die[num_die];
for (i = 0; i <= num_die-1; i++)
Die currentDie = new Die(numFaces);
protoDie = protoDie.initMultiDie(currentDie, i);
public Die (double num_die)
int numberOfDie = (int) num_die;
Die[] protoDie = new Die[numberOfDie];
System.out.print ("Enter the number of sides for die #" + i);
for (i=0; i <= protoDie.length; i++) {
do {
try {
line = br.readLine();
numFaces = Integer.parseInt(line);
catch (NumberFormatException nfe) {
System.out.println ("You must enter an integer.");
System.out.print ("Setting number of dice to 0, please reenter: ");
if (numFaces < 0) {
System.out.println ("The number of sides must be positive.");
numFaces *= -1;
System.out.println ("Number of sides is: " + numFaces);
else
if (numFaces = 0) {
System.out.println ("Zero dice is no fun. =[");
System.out.print ("Please reenter the number of sides: ");
numFaces = 0;
while (numFaces == 0);
Die currentDie = new Die(numFaces);
protoDie[i] = protoDie.initMultiDie(currentDie, i);
i = 0;
public Die[] initMultiDie (Die[] protoDie, Die currentDie, int i)
protoDie[i] = currentDie;
return protoDie;
public Die reInit (int sides)
currentDie.roll();
return currentDie;
public int roll()
faceValue = (int) (Math.random() * numFaces) + 1;
return faceValue;
}When I compile I get 2 errors at lines 42 and 73 saying:
Cannot resolve symbol | symbol: method initMultiDie(Die, int) | location: class Die[] | protoDie[i] = protoDie.initMultiDie(currentDie, i)
I've tried mixing things up with invoking the method, such as including protoDie in the parameter liist, instead of invoking the initMultiDie method thru the protoDie Die[] object. I'm a little confused as to what I can and cannot do with defining arrays of Objects like Die. Thank you for any input you may be able to provide.
~LijeI may as well just replace Die with Dice and allow
Dice to represent a collection of 1 die.. I just like
to cut on bloat and make my programs be as efficient
as possible.Efficiency and avoiding code bloat are good goals, but you don't necessarily achieve it by creating the smallest number of classes. If you have N algorithms in M lines, then you have that many, regardless of whether they're in one class or two. A really long source file can be a worse example of bloat than two source files of half the size -- it can be harder to read, less clear in the design, and thus with more bugs...
The important thing is clarity and a strong design.
The weird thing is, that initMultiDie is
what seems to be throwing up the error, but I don't
see why. Meh, I'm sure I'll figure it out.Refactoring a class to make the design more transparent often helps you figure out bugs. -
"cannot resolve symbol" when compiling a class that calls methods
I am currently taking a Intro to Java class. This problem has my instructor baffled. If I have two classes saved in separate files, for example:
one class might contain the constructor with get and set statements,
the other class contains the main() method and calls the constructor.
The first file compiles clean. When I compile the second file, I get the "cannot resolve symbol error" referring to the first class.
If I copy both files to floppy and take them to school. I can compile and run them with no problem.
If I copy the constructor file to the second file and delete the "public" from the class declaration of the constructor, it will compile and run at home.
At home, I am running Windows ME. At school, Windows 2000 Professional.
The textbook that we are using came with a CD from which I downloaded the SDK and Runtime Environment. I have tried uninstalling and reinstalling. I have also tried downloading directly from the Sun website and still the error persists.
I came across a new twist tonight. I copied class files from the CD to my hard drive. 4 separate files. 3 of which are called by the 4th.
I can run these with no problem.
Any ideas, why I would have compile errors????
Thanks!!Oooops ... violated....
Well first a constructor should have the same name as the class name so in our case what we have actually created is a static method statementOfPhilosophy() in class SetUpSite and not a constructor.
Now why does second class report unresolved symbol ???
Look at this line
Class XYZ=new XYZ();
sounds familiar, well this is what is missing from your second class, since there is no object how can it call a method ...
why the precompiled classes run is cuz they contain the right code perhaps so my suggestion to you is,
1) Review the meaning and implementation of Constructors
2) Ask your instructor to do the same ( no pun intended ... )
3) Check out this for understanding PATH & CLASSPATH http://www.geocities.com/gaurav007_2000/java/
4) Look at the "import" statement, when we have code in different files and we need to incorporate some code in another it is always a good idea to use import statement, that solves quite a few errors.
5) Finally forgive any goof up on this reply, I have looked at source code after 12 months of hibernation post dot com doom ... so m a bit rusty... shall get better soon though :)
warm regards and good wishes,
Gaurav
CW :-> Mother of all computer languages.
I HAM ( Radio-Active )
* OS has no significance in this error
** uninstalling and reinstalling ? r u nuttttttts ??? don't ever do that again unless your compiler fails to start, as long as it is giving a valid error it is working man ... all we need to do is to interpret the error and try to fix the code not the machine or compiler. -
Need help - method call error cannot resolve symbol
My code compiles fine but I continue to receive a method call error "cannot resolve symbol - variable superman" - can't figure out why. Here is my code:
public static String caesar(String message, int shift)
{ [b]String result = "";
for(int i = 0; i < message.length(); ++i)
{ [b]char newChar = message.charAt(i + shift);
result += newChar;
return result.toUpperCase();
I entered "superman" for message and "3" for the shift. Can someone please help? Thanks!Your post worked great - especially since it made me realize I was going about it all wrong! I was attempting to convert "superman" to "vxshupdq" - basically a cipher shift starting at index 0 and shifting it 3 character values which would result in s changing to v. I restructured my code:
public static String caesar(String message, int shift)
{ [b]String result = "";
for(int i = 0; i < message.length(); ++i)
{ [b]char newChar = message.charAt(i);
result += (newChar + shift) % message.length();
return result.toUpperCase();
But it's displaying the result as a "60305041". How can I get it to display the actual characters? -
Hi i have written this program but it is not compling properly. i do not know what to do to sort it. here is the code:
import java.sql.*;
import java.io.DataInputStream;
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class Phase1 extends JFrame implements ActionListener, MouseListener
//Create Buttons and Text areas etc for the GUI itself
JButton add, current, delete, order, all, exit;
JTextField textStockCode, textStockDesc, textCurrentLevel, textReorderLevel, textPrice;
JTextArea textarea;
JScrollPane pane1;
JLabel labelStockCode, labelStockDesc, labelCurrentLevel, labelReorderLevel, labelPrice, labelTextArea;
String stockCode, stockDesc, currentLevel, reorderLevel, price;
JLabel welcome;
//Setup database connections and statements for later use
Connection db_connection;
Statement db_statement;
public Phase1()
//Display a welcome message before loading system onto the screen
JOptionPane.showMessageDialog(null, "Welcome to the Stock Control System");
//set up the GUI environment to use a grid layout
Container content=this.getContentPane();
content.setLayout(new GridLayout(3,6));
//Inititlise buttons
add=new JButton("Add");
add.addActionListener(this);
current=new JButton("Show Current Level");
current.addActionListener(this);
delete=new JButton("Delete");
delete.addActionListener(this);
order=new JButton("Place Order");
order.addActionListener(this);
all = new JButton("Show All Entries");
all.addActionListener(this);
exit = new JButton("Exit");
exit.addActionListener(this);
//Add Buttons to the layout
content.add(add);
content.add(current);
content.add(delete);
content.add(order);
content.add(all);
content.add(exit);
//Initialise text fields for inputting data to the database and
//Add mouse listeners to clear the boxs on a click event
textStockCode = new JTextField("");
textStockCode.addMouseListener(this);
textStockDesc = new JTextField("");
textStockDesc.addMouseListener(this);
textCurrentLevel = new JTextField("");
textCurrentLevel.addMouseListener(this);
textReorderLevel = new JTextField("");
textReorderLevel.addMouseListener(this);
textPrice = new JTextField("");
textPrice.addMouseListener(this);
//Initialise the labels to label the Text Fields
labelStockCode = new JLabel("Stock Code");
labelStockDesc = new JLabel("Stock Description");
labelCurrentLevel = new JLabel("Current Level");
labelReorderLevel = new JLabel("Re-Order Level");
labelPrice = new JLabel("Price");
labelTextArea = new JLabel("All Objects");
//Add Text fields and labels to the GUI
content.add(labelStockCode);
content.add(textStockCode);
content.add(labelStockDesc);
content.add(textStockDesc);
content.add(labelCurrentLevel);
content.add(textCurrentLevel);
content.add(labelReorderLevel);
content.add(textReorderLevel);
content.add(labelPrice);
content.add(textPrice);
content.add(labelTextArea);
//Create a text area with scroll bar for showing Entries in the text area
textarea=new JTextArea();
textarea.setRows(6);
pane1=new JScrollPane(textarea);
content.add(pane1);
//Try to connect to the database through ODBC
try
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();
//Create a URL that identifies database
String url = "jdbc:odbc:" + "stock";
//Now attempt to create a database connection
//First parameter data source, second parameter user name, third paramater
//password, the last two paramaters may be entered as "" if no username or
//pasword is used
db_connection = DriverManager.getConnection(url, "demo","");
//Create a statement to send SQL
db_statement = db_connection.createStatement();
catch (Exception ce){} //driver not found
//action performed method for button click events
public void actionPerformed(ActionEvent ev)
if(ev.getSource()==add) //If add button clicked
try
add(); //Run add() method
catch(Exception e){}
if(ev.getSource()==current)
{ //If Show Current Level Button Clicked
try
current(); //Run current() method
catch(Exception e){}
if(ev.getSource()==delete)
{ //If Show Delete Button Clicked
try
delete(); //Run delete() method
catch(Exception e){}
if(ev.getSource()==order) //If Show Order Button Clicked
try
order(); //Run order() method
catch(Exception e){}
if(ev.getSource()==all) //If Show Show All Button Clicked
try
all(); //Run all() method
catch(Exception e){}
if(ev.getSource()==exit) //If Show Exit Button Clicked
try{
exit(); //Run exit() method
catch(Exception e){}
public void add() throws Exception //add a new stock item
stockCode = textStockCode.getText();
stockDesc = textStockDesc.getText();
currentLevel = textCurrentLevel.getText();
reorderLevel = textReorderLevel.getText();
price = textPrice.getText();
if(stockCode.equals(""))
JOptionPane.showMessageDialog(null,"Ensure Stock Code is filled out");
if(stockDesc.equals(""))
JOptionPane.showMessageDialog(null,"Ensure Description is filled out");
if(price.equals(""))
JOptionPane.showMessageDialog(null,"Ensure price is filled out");
if(currentLevel.equals(""))
JOptionPane.showMessageDialog(null,"Ensure Current Level is filled out");
if(reorderLevel.equals(""))
JOptionPane.showMessageDialog(null,"Ensure Re-Order Level is filled out");
else
//Add item to database with variables set from text fields
db_statement.executeUpdate("INSERT INTO stock VALUES
('"+stockCode+"','"+stockDesc+"','"+currentLevel+"','"+reorderLevel+"','"+price+"')");
public void current() throws Exception //check a current stock level
if(textStockCode.getText().equals(""))//if no stockcode has been entered
JOptionPane.showMessageDialog(null,"Enter a Stock Code.");
else
ResultSet resultcurrent = db_statement.executeQuery("SELECT * FROM stock WHERE StockCode = '"+textStockCode.getText()+"'");
textarea.setText("");
if(resultcurrent.next())
do
textarea.setText("Stock Code: "+resultcurrent.getString("StockCode")+"\nDescription:
"+resultcurrent.getString("StockDescription")+"\nCurrent Level: "+resultcurrent.getInt("CurrentLevel")+"\nRe-Order Level:
"+resultcurrent.getInt("ReorderLevel")+"\nPrice: "+resultcurrent.getFloat("Price"));
while(resultcurrent.next());
else
//Display Current Stock Item (selected from StockCode Text field in the scrollable text area
JOptionPane.showMessageDialog(null,"Not a valid Stock Code");
public void delete() throws Exception //delete a current stock item
if(textStockCode.getText().equals("")) //Check there is a stock code entered
JOptionPane.showMessageDialog(null,"Enter a Stock Code.");
else
//Delete Item from database where Stock Code is what is in Stock Code Text Field
db_statement.executeUpdate("DELETE * FROM stock WHERE StockCode='"+textStockCode.getText()+"'");
public void order() throws Exception //check price for an order
if(textStockCode.getText().equals("")) //Check there is a stock code entered
JOptionPane.showMessageDialog(null,"Enter a Stock Code.");
else
//Set some variables to aid ordering
float price = 0;
int currentlevel = 0;
int newlevel = 0;
int reorder = 0;
String StockCode = textStockCode.getText();
//Post a message asking how many to order
String str_quantity = JOptionPane.showInputDialog(null,"Enter Quantity: ","Adder",JOptionPane.PLAIN_MESSAGE);
int quantity = Integer.parseInt(str_quantity);
//Get details from database for current item
ResultSet resultorder = db_statement.executeQuery("SELECT * FROM stock WHERE StockCode='"+StockCode+"'");
//Set variables from database to aid ordering
while (resultorder.next())
price = resultorder.getFloat("Price");
currentlevel = (resultorder.getInt("CurrentLevel"));
reorder = (resultorder.getInt("ReorderLevel"));
//Set the new level to update the database
newlevel = currentlevel - quantity;
//calculate the total price of the order
float total = price * quantity;
//If the stock quantity is 0
if(quantity == 0)
//Display a message saying there are none left in stock
JOptionPane.showMessageDialog(null,"No Stock left for this item");
//Otherwise check that the quantity ordered is more than what is lewft in stock
else if(quantity > currentlevel)
//If ordered too many display a message saying so
JOptionPane.showMessageDialog(null,"Not enough in stock, order less");
else
//Otherwise Display the total in a message box
JOptionPane.showMessageDialog(null,"Total is: "+total);
//then update the database with new values
db_statement.executeUpdate("UPDATE Stock SET CurrentLevel="+newlevel+" WHERE StockCode='"+StockCode+"'");
//Check if the new level is 0
if(newlevel == 0)
//If new level IS 0, send a message to screen saying so
JOptionPane.showMessageDialog(null,"There is now no Stock left.");
else
//otherwise if the newlevel of stock is the same as the reorder level
if(newlevel == reorder)
// display a message to say so
JOptionPane.showMessageDialog(null,"You are now at the re-order level, Get some more of this item in
stock.");
//Otherwise if the new level is lower than the reorder level,
if(newlevel < reorder)
//Display a message saying new level is below reorder level so get some more stock
JOptionPane.showMessageDialog(null,"You are now below the reorder level. Get some more of this item in
stock.");
public void all() throws Exception //show all stock items and details
//Get everthing from the database
ResultSet resultall = db_statement.executeQuery("SELECT * FROM Stock");
textarea.setText("");
while (resultall.next())
//Display all items of stock in the Text Area one after the other
textarea.setText(textarea.getText()+"Stock Code: "+resultall.getString("StockCode")+"\nDescription:
"+resultall.getString("StockDescription")+"\nCurrent Level: "+resultall.getInt("CurrentLevel")+"\nRe-Order Level:
"+resultall.getInt("ReorderLevel")+"\nPrice: "+resultall.getFloat("Price")+"\n\n");
public void exit() throws Exception //exit
//Cause the system to close the window, exiting.
db_connection.commit();
db_connection.close();
System.exit(0);
public static void main(String args[])
//Initialise a frame
JDBCFrame win=new JDBCFrame();
//Set the size to 800 pixels wide and 350 pixels high
win.setSize(900,350);
//Set the window as visible
win.setVisible(true);
win.addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent e)
System.exit(0);
//Mouse Listener Commands
public void mousePressed(MouseEvent evt)
if (evt.getSource()==textStockCode)
//Clear the Stock Code text field on clickin on it
textStockCode.setText("");
else if (evt.getSource()==textStockDesc)
//Clear the Stock Description text field on clickin on it
textStockDesc.setText("");
else if (evt.getSource()==textCurrentLevel)
textCurrentLevel.setText("");
//Clear the Current Level text field on clickin on it
else if (evt.getSource()==textReorderLevel)
textReorderLevel.setText("");
//Clear the Re-Order Level text field on clickin on it
else if (evt.getSource()==textPrice)
textPrice.setText("");
//Clear the Price text field on clickin on it
public void mouseReleased(MouseEvent evt){}
public void mouseClicked(MouseEvent evt){}
public void mouseEntered(MouseEvent evt){}
public void mouseExited(MouseEvent evt){}
}And this is the error that i get when compiling:
Phase1.java:355: cannot resolve symbol
symbol : class JDBCFrame
location: class Phase1
JDBCFrame win=new JDBCFrame();
^
Phase1.java:355: cannot resolve symbol
symbol : class JDBCFrame
location: class Phase1
JDBCFrame win=new JDBCFrame();Thanks for any help you can give meThe error is very clear here
Phase1.java:355: cannot resolve symbolsymbol : class JDBCFramelocation: class Phase1 JDBCFrame win=new JDBCFrame();
Where is this class JDBCFrame()?
Import that package or class -
"cannot resolve symbol" error when using super.paintComponent
I am trying to override the paintComponent method in a class extending a JFrame, but when I call super.paintComponent(g) from inside the overridden method I get the error
QubicGUI.java:63: cannot resolve symbol
symbol : method paintComponent (java.awt.Graphics)
location: class javax.swing.JFrame
super.paintComponent(g);
^
1 error
I can't see where I am deviating from examples I know work. It is a very small program, so I have included it here:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.io.IOException;
import javax.imageio.ImageIO;
import java.net.URL;
class QubicGUI extends JFrame
private int width;
private int height;
private Image background;
public int getWidth()
{ return width; }
public int getHeight()
{ return height; }
public boolean isOpaque()
return true;
public QubicGUI()
super("Qubic"); //set title
// The following gets the default screen device for the purpose of finding the
// current settings of height and width of the screen
GraphicsEnvironment environment = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice device = environment.getDefaultScreenDevice();
DisplayMode display = device.getDisplayMode();
width = display.getWidth();
height = display.getHeight();
// Here we set the window to cover the entire screen with a black background, and
// remove the decorations. (This includes the title bar and close, minimize and
// maximize buttons and the border)
setUndecorated(false);
setVisible(true);
setSize(width,height);
setResizable(false);
setBackground(Color.black);
// Initializes the background Image
Image background = Toolkit.getDefaultToolkit().getImage("background.gif");
// This is included for debugging with a decorated window.
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
} // end constructor
public void paintComponent(Graphics g)
super.paintComponent(g);
} // end paintComponenet
} // end QubicGUITwo things I want to know:
1. I was trying to access a variable as JLabel
myLabel; defined in the constructor of a class from
the constructor of another class. I got this error
message - "Cannot access non-static variable from a
static context". Why(When both are non-static am I
getting the message as static context)?Post some code. It's hard to pinpoint a syntax error like that without seeing the code.
Also, there may be cleaner ways of doing what you want without having classes sharing labels.
2. I am using a map to set the attributes of a font.
One of the key-value pair of the map is
TextAttributesHashMap.put(TextAttribute.FOREGROUND,Colo
.BLUE);
But when I using the statement g.drawString("First
line of the address", 40, 200); the text being
displayed is in black and not blue. Why?You need to use the drawString that takes an AttributedCharacterIterator:
import java.awt.*;
import java.awt.font.*;
import java.text.*;
import javax.swing.*;
public class Example extends JPanel {
public static void main(String[] args) {
JFrame f = new JFrame("Example");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container cp = f.getContentPane();
cp.add(new Example());
f.setSize(400,300);
f.setLocationRelativeTo(null);
f.setVisible(true);
protected void paintComponent(Graphics g) {
super.paintComponent(g);
String text = "Every good boy does fine always";
AttributedString as = new AttributedString(text);
as.addAttribute(TextAttribute.FAMILY, "Lucida Bright");
as.addAttribute(TextAttribute.SIZE, new Float(16));
as.addAttribute(TextAttribute.FOREGROUND, Color.BLUE, 0, 5);
as.addAttribute(TextAttribute.FOREGROUND, Color.GREEN, 6, 10);
as.addAttribute(TextAttribute.FOREGROUND, Color.RED, 11, 14);
as.addAttribute(TextAttribute.FOREGROUND, Color.YELLOW, 15, 19);
as.addAttribute(TextAttribute.FOREGROUND, Color.MAGENTA, 20, 24);
as.addAttribute(TextAttribute.FOREGROUND, Color.CYAN, 25, 31);
g.drawString(as.getIterator(), 10, 20); -
Cannot resolve symbol switch( faces[i] ){
ok, back to "how do i"
... can u take a peek at this & tell me what i've done wrong? Please?
i have an array that holds the card count,
faces[2][][][][3][][][][][] <<<< has 2 aces & 3 5's
and i am trying to acces this array in method EVALUATE
method EVALUATE is called from Class Ex3_10c
and evaluate is an inner class??
problem:
C:\J\jhtp\exerc\chptr10\Ex10_3c.java:100: cannot resolve symbol
symbol : variable faces
location: class Ex10_3c
switch(faces){
^
C:\J\jhtp\exerc\chptr10\Ex10_3c.java:103: cannot resolve symbol
symbol : variable faces
location: class Ex10_3c
displayHand1.append( "\n" + "Case 1: " + faces[i] );
public class Ex10_3c extends JFrame {
private Card deck[];
private Card hand[];
private int currentCard;
private JButton dealButton, shuffleButton;
//private JTextField displayHand1;
private JTextArea displayHand1;
private JLabel status;
public Ex10_3c()
super( "Card Dealing Program" );
final int faces[] = new int[13];
int suits[] = new int[4];
deck = new Card[ 52 ];
currentCard = -1;
hand = new Card[5];
for ( int i = 0; i < deck.length; i++ )
deck[ i ] = new Card( i%13,i/13 );
//deck[i] = new Card(face[i%13],suits[i/13]<<<<WRONG understand what your passing
Container c = getContentPane();
c.setLayout( new FlowLayout() );
displayHand1 = new JTextArea( 9,15);
dealButton = new JButton( "Deal Hand1" );
dealButton.addActionListener(
new ActionListener() {
public void actionPerformed( ActionEvent e )
displayHand1.setText("");
int cntr = 0;
while ( cntr<5 ){
Card dealt = dealCard();
if ( dealt != null ) {
hand[cntr] = dealt;
displayHand1.append( "\n" + dealt.toString() );
status.setText( "Card #: " + currentCard );
if (cntr==5){evaluate();}
cntr++;
else {
displayHand1.setText(
"NO MORE CARDS TO DEAL" );
status.setText(
"Shuffle cards to continue" );
cntr = 6;
}//endo of while
}//end of actionPerformed
}//endof actionListener
c.add( dealButton );
shuffleButton = new JButton( "Shuffle cards" );
shuffleButton.addActionListener(
new ActionListener() {
public void actionPerformed( ActionEvent e )
displayHand1.setText( "SHUFFLING ..." );
shuffle();
displayHand1.setText( "DECK IS SHUFFLED" );
c.add( shuffleButton );
displayHand1 = new JTextArea( 9,15 );
displayHand1.setEditable( false );
c.add( displayHand1 );
status = new JLabel();
c.add( status );
setSize( 300, 300 ); // set the window size
show(); // show the window
public String evaluate(){
//go thru array & determine if its holding counts > 2, if so then good value
//you have an array of 13,holding cnt within array for each face-card in hand
//you have an array of 4,holding cnt within array for each suit-card in hand
//does hand[] contain 2 of the same numbers
for (int i=0; i<13; i++){
switch(faces){
case 0:
displayHand1.append( "\n" + "Case 1: " + faces[i] );
case 1:
displayHand1.append( "\n" + "Case 2: " + faces[i] );
case 2:
displayHand1.append( "\n" + "Case 3: " + faces[i] );
case 3:
displayHand1.append( "\n" + "Case 4: " + faces[i] );
default:
displayHand1.append( "\n" + "Case default: ");
}//end of switch
}//end of for
}//end of evaluate
public void shuffle()
currentCard = -1;
for ( int i = 0; i < deck.length; i++ ) {
int j = ( int ) ( Math.random() * 52 );
Card temp = deck[ i ]; // swap
deck[ i ] = deck[ j ]; // the
deck[ j ] = temp; // cards
dealButton.setEnabled( true );
public Card dealCard()
if ( ++currentCard < deck.length )
return deck[ currentCard ];
else {
dealButton.setEnabled( false );
return null;
public static void main( String args[] )
Ex10_3c app = new Ex10_3c();
app.addWindowListener(
new WindowAdapter() {
public void windowClosing( WindowEvent e )
System.exit( 0 );
class Card {
private int face;
private int suit;
public Card( int f, int s )
face = f;
suit = s;
public int getFace(){
return face;
public int getSuit(){
return suit;
public String toString() { return face + " of " + suit; }Hey,
faces is not in scope in the evaluate function, because it is declared in the constructor, but used in another method. A variable is valid until the next (matching) }.
Declaring faces outside of the function will do the trick.
Kind regards,
Levi -
Illegal start of expression and cannot resolve symbol HELP
Can someone pls help me?
These are the two problems:
--------------------Configuration: j2sdk1.4.1_02 <Default>--------------------
C:\Documents and Settings\Laila\My Documents\CMT2080\Coursework\Game\Mindboggler.java:291: illegal start of expression
public void inputJButtonActionPerformed( ActionEvent event )
^
C:\Documents and Settings\Laila\My Documents\CMT2080\Coursework\Game\Mindboggler.java:285: cannot resolve symbol
symbol: method inputJButtonActionPerformed (java.awt.event.ActionEvent)
inputJButtonActionPerformed( event);
Here is my code :
//Mind boggler quiz
//Marcelyn Samson
import java.awt.*;
import java.awt.event.*;
import java.text.DecimalFormat;
import javax.swing.*;
import javax.swing.border.*;
import java.lang.*;
public class Mindboggler extends JFrame
// JPanel for welcome window
private JPanel welcomeJPanel;
private JPanel presetJPanel;
private JLabel titleJLabel;
private JLabel quizJLabel;
private JLabel girlJLabel, headJLabel;
private JLabel introJLabel;
private JButton startJButton;
// JPanel for questionone window
private JPanel questiononeJPanel;
private JLabel textJLabel;
private JPanel becksJPanel;
private JButton oneJButton, twoJButton, threeJButton, fourJButton, nextJButton;
//JPanel for questiontwo window
private JPanel questiontwoJPanel;
private JPanel orlandoJPanel;
private JLabel q2JLabel;
private JCheckBox lordJCheckBox;
private JCheckBox faceJCheckBox;
private JCheckBox piratesJCheckBox;
private JButton next2JButton;
private JButton inputJButton;
//JPanel for questionthree
private JPanel questionthreeJPanel;
private JPanel howmuchJPanel;
private JLabel howmuchJLabel;
private JLabel nameJLabel;
private JTextField nameJTextField;
private JLabel moneyJLabel;
private JTextField moneyJTextField;
private JButton next3JButton;
//Publics
public JPanel welcomeJFrame, questionJFrame, questiontwoJFrame, questionthreeJFrame;
//contentPane
public Container contentPane;
//no argument constructor
public Mindboggler()
createUserInterface();
//create and position components
private void createUserInterface()/////////////////////////; semo colon do not edit copy paste
//get contentPane and set layout to null
contentPane = getContentPane();
contentPane.setLayout ( null );
welcome();
//set properties of applications window
setTitle( "Mindboggler" ); // set JFrame's title bar string
setSize( 600, 400 ); // set width and height of JFrame
setVisible( true ); // display JFrame on screen
} // end method createUserInterface
public void welcome(){
// set up welcomeJPanel
welcomeJPanel = new JPanel();
welcomeJPanel.setLayout( null );
welcomeJPanel.setBounds(0, 0, 600, 400);
welcomeJPanel.setBackground( Color.GREEN );
// set up textJLabel
titleJLabel = new JLabel();
titleJLabel.setText( "Mind Boggler" );
titleJLabel.setLocation( 30, 10);
titleJLabel.setSize( 550, 70);
titleJLabel.setFont( new Font( "SansSerif", Font.PLAIN, 30 ) );
titleJLabel.setHorizontalAlignment( JLabel.CENTER );
welcomeJPanel.add( titleJLabel );
// set up presetJPanel
presetJPanel = new JPanel();
presetJPanel.setLayout( null );
presetJPanel.setBounds( 150, 10, 300, 80 );
presetJPanel.setBackground( Color.GRAY );
welcomeJPanel.add( presetJPanel );
//setup Intro JLabel
introJLabel = new JLabel();
introJLabel.setText( "Think, think, think. Can you get all the questions right?" );
introJLabel.setBounds( 40, 100, 500, 200 );
introJLabel.setFont( new Font( "SansSerif", Font.PLAIN, 18 ) );
introJLabel.setHorizontalAlignment( JLabel.CENTER );
welcomeJPanel.add(introJLabel);
//set up head JLabel
headJLabel = new JLabel();
headJLabel.setIcon( new ImageIcon( "head.jpeg") );
headJLabel.setBounds( 540, 5, 40, 160 );
headJLabel.setHorizontalAlignment( JLabel.CENTER );
welcomeJPanel.add(headJLabel);
//setup girlJLabel
girlJLabel = new JLabel();
girlJLabel.setIcon( new ImageIcon( "girl.Jjpeg") );
girlJLabel.setBounds( 5, 10, 60, 100 );
girlJLabel.setHorizontalAlignment( JLabel.CENTER );
welcomeJPanel.add(girlJLabel);
//set up startJbutton
startJButton = new JButton();
startJButton.setText( "Start" );
startJButton.setBounds(250, 300, 100, 30);
startJButton.setFont( new Font( "SansSerif", Font.BOLD, 14) );
welcomeJPanel.add(startJButton);
contentPane.add(welcomeJPanel);
startJButton.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
question();
public void question()
//set up question one JPanel
welcomeJPanel.setVisible(false);
questiononeJPanel = new JPanel();
questiononeJPanel.setLayout( null );
questiononeJPanel.setBounds(0, 0, 600,400);
questiononeJPanel.setBackground( Color.GREEN );
// set up textJLabel
textJLabel = new JLabel();
textJLabel.setText( "Who did Beckham supposedly cheat with?" );
textJLabel.setLocation( 20, 20);
textJLabel.setSize( 550, 70);
textJLabel.setFont( new Font( "SansSerif", Font.BOLD, 20 ) );
textJLabel.setHorizontalAlignment( JLabel.CENTER );
questiononeJPanel.add( textJLabel );
// set up presetJPanel
becksJPanel = new JPanel();
becksJPanel.setLayout( null );
becksJPanel.setBorder( new TitledBorder(
"Question 1" ) );
becksJPanel.setBounds( 10, 10, 570, 80 );
becksJPanel.setBackground( Color.GRAY );
questiononeJPanel.add( becksJPanel );
// set up oneJButton
oneJButton = new JButton();
oneJButton.setBounds( 10, 120, 300, 40 );
oneJButton.setText( "Britney Spears" );
oneJButton.setBackground( Color.ORANGE );
questiononeJPanel.add( oneJButton );
// set up twoJButton
twoJButton = new JButton();
twoJButton.setBounds( 10, 180, 300, 40 );
twoJButton.setText( "Meg Ryan" );
twoJButton.setBackground( Color.ORANGE );
questiononeJPanel.add( twoJButton );
// set up threeJButton
threeJButton = new JButton();
threeJButton.setBounds( 10, 240, 300, 40 );
threeJButton.setText( "Rebecca Loos" );
threeJButton.setBackground( Color.ORANGE );
questiononeJPanel.add( threeJButton );
// set up fourJButton
fourJButton = new JButton();
fourJButton.setBounds( 10, 300, 300, 40 );
fourJButton.setText( "Angelina Jolie" );
fourJButton.setBackground( Color.ORANGE );
questiononeJPanel.add( fourJButton );
// set up nextJButton
nextJButton = new JButton();
nextJButton.setBounds ( 375, 300, 150, 40 );
nextJButton.setText("Next");
nextJButton.setBackground( Color.GRAY );
questiononeJPanel.add( nextJButton );
contentPane.add(questiononeJPanel);
nextJButton.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
questiontwo();
public void questiontwo()
//set up question two JPanel
questiononeJPanel.setVisible(false);
questiontwoJPanel=new JPanel();
questiontwoJPanel.setLayout(null);
questiontwoJPanel.setBounds(0, 0, 600, 400);
questiontwoJPanel.setBackground( Color.GREEN );
// set up q2JLabel
q2JLabel = new JLabel();
q2JLabel.setBounds( 20, 20, 550, 70 );
q2JLabel.setText( "What films has Orlando Bloom starred in?" );
q2JLabel.setFont(new Font( "SansSerif", Font.BOLD, 20 ) );
q2JLabel.setHorizontalAlignment( JLabel.CENTER );
questiontwoJPanel.add(q2JLabel);
//set up orlandoJPanel
orlandoJPanel = new JPanel();
orlandoJPanel.setLayout(null);
orlandoJPanel.setBorder( new TitledBorder("Question 2"));
orlandoJPanel.setBounds( 10, 10, 570, 80);
orlandoJPanel.setBackground(Color.GRAY);
questiontwoJPanel.add(orlandoJPanel);
// set up lordJCheckBox
lordJCheckBox = new JCheckBox();
lordJCheckBox.setBounds( 16, 112, 200, 24 );
lordJCheckBox.setText( "1. Lord of The Rings" );
questiontwoJPanel.add( lordJCheckBox );
// set up faceJCheckBox
faceJCheckBox = new JCheckBox();
faceJCheckBox.setBounds( 16, 159, 200, 24 );
faceJCheckBox.setText( "2. Face Off" );
questiontwoJPanel.add( faceJCheckBox );
// set up piratesJCheckBox
piratesJCheckBox = new JCheckBox();
piratesJCheckBox.setBounds( 16, 206, 200, 24 );
piratesJCheckBox.setText( "3. Pirates of The Caribean" );
questiontwoJPanel.add( piratesJCheckBox );
// set up inputJButton
inputJButton = new JButton();
inputJButton.setBounds(20, 256, 200, 21 );
inputJButton.setText( "Input answer" );
questiontwoJPanel.add( inputJButton );
inputJButton.addActionListener(
new ActionListener()
//event handler called when user clicks inputJButton
public void actionPerformed( ActionEvent event )
inputJButtonActionPerformed( event);
//show JOptionMessages when user clicks on JCheckBoxes and inputJButton
public void inputJButtonActionPerformed( ActionEvent event )
//display error message if no JCheckBoxes is checked
if ( ( !lordJCheckBox.isSelected() && !faceJCheckBox.isSelected() && !piratesJCheckBox.isSelected() ) )
//display error message
JOptionPane.showMessageDialog( null, "Please check two boxes", JOptionPane.ERROR_MESSAGE );
// if lordjcheckbox and pirates is selected = right
else
if ( ( lordJCheckBox.isSelected() && piratesJCheckBox.isSelected() ))
JOptionPane.showMessageDialog(null, "Thats RIGHT!");
//if others are selected = wrong
else
if ( (lordJCheckBox.isSelected() && faceJCheckBox.isSelected() ))
JOptionPane.showMessageDialog(null, "Thats WRONG");
else
( (faceJCheckBox.isSelected() && piratesJCheckBox.isSelected() ))
JOptionPane.showMessageDialog(null, "Thats WRONG");
// set up nest2JButton
next2JButton = new JButton();
next2JButton.setBounds( 155, 296, 94, 24 );
next2JButton.setText( "Next" );
questiontwoJPanel.add( next2JButton );
contentPane.add(questiontwoJPanel);
next2JButton.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
questionthree();
} // end questiontwo
public void questionthree()
//setup questionthree JPanel
questiontwoJPanel.setVisible(false);
questionthreeJPanel = new JPanel();
questionthreeJPanel.setLayout(null);
questionthreeJPanel.setBounds(0, 0, 600, 400);
questionthreeJPanel.setBackground( Color.GREEN);
// main method
public static void main( String[] args )
Mindboggler application = new Mindboggler();
application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
} // end method main
}// end class
WOULD BE VERY GEATFULJust want to say thank you by the way for trying to help. Ive moved public void inputJButtonActionPerformed( ActionEvent event ) outside of brackets. Now i have a different problem on it. Sorry about this.
PROBLEM: --------------------Configuration: <Default>--------------------
C:\Documents and Settings\Laila\My Documents\CMT2080\Coursework\Game\Mindboggler.java:353: 'else' without 'if'
else ( ( !lordJCheckBox.isSelected() && !faceJCheckBox.isSelected && !piratesJCheckBox.isSelected() ) )
^
1 error
Process completed.
MY CODE:
//Mind boggler quiz
//Marcelyn Samson
import java.awt.*;
import java.awt.event.*;
import java.text.DecimalFormat;
import javax.swing.*;
import javax.swing.border.*;
import java.lang.*;
public class Mindboggler extends JFrame
// JPanel for welcome window
private JPanel welcomeJPanel;
private JPanel presetJPanel;
private JLabel titleJLabel;
private JLabel quizJLabel;
private JLabel girlJLabel, headJLabel;
private JLabel introJLabel;
private JButton startJButton;
// JPanel for questionone window
private JPanel questiononeJPanel;
private JLabel textJLabel;
private JPanel becksJPanel;
private JButton oneJButton, twoJButton, threeJButton, fourJButton, nextJButton;
//JPanel for questiontwo window
private JPanel questiontwoJPanel;
private JPanel orlandoJPanel;
private JLabel q2JLabel;
private JCheckBox lordJCheckBox;
private JCheckBox faceJCheckBox;
private JCheckBox piratesJCheckBox;
private JButton next2JButton;
private JButton inputJButton;
//JPanel for questionthree
private JPanel questionthreeJPanel;
private JPanel howmuchJPanel;
private JLabel howmuchJLabel;
private JLabel nameJLabel;
private JTextField nameJTextField;
private JLabel moneyJLabel;
private JTextField moneyJTextField;
private JButton next3JButton;
//Publics
public JPanel welcomeJFrame, questionJFrame, questiontwoJFrame, questionthreeJFrame;
//contentPane
public Container contentPane;
//no argument constructor
public Mindboggler()
createUserInterface();
//create and position components
private void createUserInterface()/////////////////////////; semo colon do not edit copy paste
//get contentPane and set layout to null
contentPane = getContentPane();
contentPane.setLayout ( null );
welcome();
//set properties of applications window
setTitle( "Mindboggler" ); // set JFrame's title bar string
setSize( 600, 400 ); // set width and height of JFrame
setVisible( true ); // display JFrame on screen
} // end method createUserInterface
public void welcome(){
// set up welcomeJPanel
welcomeJPanel = new JPanel();
welcomeJPanel.setLayout( null );
welcomeJPanel.setBounds(0, 0, 600, 400);
welcomeJPanel.setBackground( Color.GREEN );
// set up textJLabel
titleJLabel = new JLabel();
titleJLabel.setText( "Mind Boggler" );
titleJLabel.setLocation( 30, 10);
titleJLabel.setSize( 550, 70);
titleJLabel.setFont( new Font( "SansSerif", Font.PLAIN, 30 ) );
titleJLabel.setHorizontalAlignment( JLabel.CENTER );
welcomeJPanel.add( titleJLabel );
// set up presetJPanel
presetJPanel = new JPanel();
presetJPanel.setLayout( null );
presetJPanel.setBounds( 150, 10, 300, 80 );
presetJPanel.setBackground( Color.GRAY );
welcomeJPanel.add( presetJPanel );
//setup Intro JLabel
introJLabel = new JLabel();
introJLabel.setText( "Think, think, think. Can you get all the questions right?" );
introJLabel.setBounds( 40, 100, 500, 200 );
introJLabel.setFont( new Font( "SansSerif", Font.PLAIN, 18 ) );
introJLabel.setHorizontalAlignment( JLabel.CENTER );
welcomeJPanel.add(introJLabel);
//set up head JLabel
headJLabel = new JLabel();
headJLabel.setIcon( new ImageIcon( "head.jpeg") );
headJLabel.setBounds( 540, 5, 40, 160 );
headJLabel.setHorizontalAlignment( JLabel.CENTER );
welcomeJPanel.add(headJLabel);
//setup girlJLabel
girlJLabel = new JLabel();
girlJLabel.setIcon( new ImageIcon( "girl.Jjpeg") );
girlJLabel.setBounds( 5, 10, 60, 100 );
girlJLabel.setHorizontalAlignment( JLabel.CENTER );
welcomeJPanel.add(girlJLabel);
//set up startJbutton
startJButton = new JButton();
startJButton.setText( "Start" );
startJButton.setBounds(250, 300, 100, 30);
startJButton.setFont( new Font( "SansSerif", Font.BOLD, 14) );
welcomeJPanel.add(startJButton);
contentPane.add(welcomeJPanel);
startJButton.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
question();
public void question()
//set up question one JPanel
welcomeJPanel.setVisible(false);
questiononeJPanel = new JPanel();
questiononeJPanel.setLayout( null );
questiononeJPanel.setBounds(0, 0, 600,400);
questiononeJPanel.setBackground( Color.GREEN );
// set up textJLabel
textJLabel = new JLabel();
textJLabel.setText( "Who did Beckham supposedly cheat with?" );
textJLabel.setLocation( 20, 20);
textJLabel.setSize( 550, 70);
textJLabel.setFont( new Font( "SansSerif", Font.BOLD, 20 ) );
textJLabel.setHorizontalAlignment( JLabel.CENTER );
questiononeJPanel.add( textJLabel );
// set up presetJPanel
becksJPanel = new JPanel();
becksJPanel.setLayout( null );
becksJPanel.setBorder( new TitledBorder(
"Question 1" ) );
becksJPanel.setBounds( 10, 10, 570, 80 );
becksJPanel.setBackground( Color.GRAY );
questiononeJPanel.add( becksJPanel );
// set up oneJButton
oneJButton = new JButton();
oneJButton.setBounds( 10, 120, 300, 40 );
oneJButton.setText( "Britney Spears" );
oneJButton.setBackground( Color.ORANGE );
questiononeJPanel.add( oneJButton );
// set up twoJButton
twoJButton = new JButton();
twoJButton.setBounds( 10, 180, 300, 40 );
twoJButton.setText( "Meg Ryan" );
twoJButton.setBackground( Color.ORANGE );
questiononeJPanel.add( twoJButton );
// set up threeJButton
threeJButton = new JButton();
threeJButton.setBounds( 10, 240, 300, 40 );
threeJButton.setText( "Rebecca Loos" );
threeJButton.setBackground( Color.ORANGE );
questiononeJPanel.add( threeJButton );
// set up fourJButton
fourJButton = new JButton();
fourJButton.setBounds( 10, 300, 300, 40 );
fourJButton.setText( "Angelina Jolie" );
fourJButton.setBackground( Color.ORANGE );
questiononeJPanel.add( fourJButton );
// set up nextJButton
nextJButton = new JButton();
nextJButton.setBounds ( 375, 300, 150, 40 );
nextJButton.setText("Next");
nextJButton.setBackground( Color.GRAY );
questiononeJPanel.add( nextJButton );
contentPane.add(questiononeJPanel);
nextJButton.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
questiontwo();
public void questiontwo()
//set up question two JPanel
questiononeJPanel.setVisible(false);
questiontwoJPanel=new JPanel();
questiontwoJPanel.setLayout(null);
questiontwoJPanel.setBounds(0, 0, 600, 400);
questiontwoJPanel.setBackground( Color.GREEN );
// set up q2JLabel
q2JLabel = new JLabel();
q2JLabel.setBounds( 20, 20, 550, 70 );
q2JLabel.setText( "What films has Orlando Bloom starred in?" );
q2JLabel.setFont(new Font( "SansSerif", Font.BOLD, 20 ) );
q2JLabel.setHorizontalAlignment( JLabel.CENTER );
questiontwoJPanel.add(q2JLabel);
//set up orlandoJPanel
orlandoJPanel = new JPanel();
orlandoJPanel.setLayout(null);
orlandoJPanel.setBorder( new TitledBorder("Question 2"));
orlandoJPanel.setBounds( 10, 10, 570, 80);
orlandoJPanel.setBackground(Color.GRAY);
questiontwoJPanel.add(orlandoJPanel);
// set up lordJCheckBox
lordJCheckBox = new JCheckBox();
lordJCheckBox.setBounds( 16, 112, 200, 24 );
lordJCheckBox.setText( "1. Lord of The Rings" );
questiontwoJPanel.add( lordJCheckBox );
// set up faceJCheckBox
faceJCheckBox = new JCheckBox();
faceJCheckBox.setBounds( 16, 159, 200, 24 );
faceJCheckBox.setText( "2. Face Off" );
questiontwoJPanel.add( faceJCheckBox );
// set up piratesJCheckBox
piratesJCheckBox = new JCheckBox();
piratesJCheckBox.setBounds( 16, 206, 200, 24 );
piratesJCheckBox.setText( "3. Pirates of The Caribean" );
questiontwoJPanel.add( piratesJCheckBox );
// set up inputJButton
inputJButton = new JButton();
inputJButton.setBounds(20, 256, 200, 21 );
inputJButton.setText( "Input answer" );
questiontwoJPanel.add( inputJButton );
inputJButton.addActionListener(
new ActionListener()
//event handler called when user clicks inputJButton
public void actionPerformed( ActionEvent event )
inputJButtonActionPerformed( event);
// set up nest2JButton
next2JButton = new JButton();
next2JButton.setBounds( 155, 296, 94, 24 );
next2JButton.setText( "Next" );
questiontwoJPanel.add( next2JButton );
contentPane.add(questiontwoJPanel);
next2JButton.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
questionthree();
} // end questiontwo
public void questionthree()
//setup questionthree JPanel
questiontwoJPanel.setVisible(false);
questionthreeJPanel = new JPanel();
questionthreeJPanel.setLayout(null);
questionthreeJPanel.setBounds(0, 0, 600, 400);
questionthreeJPanel.setBackground( Color.GREEN);
//setup howmuchJLabel
howmuchJLabel = new JLabel();
howmuchJLabel.setText("I'm a student and would be very greatful if you could donate some money as it would help me very much.");
howmuchJLabel.setBounds(20, 20, 550, 70);
howmuchJLabel.setFont(new Font("SansSerif",Font.BOLD,14));
howmuchJLabel.setHorizontalAlignment(JLabel.CENTER);
questionthreeJPanel.add(howmuchJLabel);
//setup howmuchJPanel
howmuchJPanel = new JPanel();
howmuchJPanel.setLayout(null);
howmuchJPanel.setBorder( new TitledBorder("Question 3"));
howmuchJPanel.setBounds(10, 10, 570, 80);
howmuchJPanel.setBackground( Color.GRAY);
questionthreeJPanel.add(howmuchJPanel);
//setup nameJLabel
nameJLabel = new JLabel();
nameJLabel.setText("Name");
nameJLabel.setBounds(10, 160, 150, 24);
nameJLabel.setFont(new Font("SansSerif",Font.BOLD,12));
questionthreeJPanel.add(nameJLabel);
//setup nameJTextField
nameJTextField = new JTextField();
nameJTextField.setBounds(125, 160, 200, 24 );
questionthreeJPanel.add(nameJTextField);
contentPane.add(questionthreeJPanel);
//show JOptionMessages when user clicks on JCheckBoxes and inputJButton
public void inputJButtonActionPerformed( ActionEvent event )
//display error message if no JCheckBoxes is checked
else ( ( !lordJCheckBox.isSelected() && !faceJCheckBox.isSelected && !piratesJCheckBox.isSelected() ) )
//display error message
JOptionPane.showMessageDialog( null, "Please check two boxes", JOptionPane.ERROR_MESSAGE );
// if lordjcheckbox and pirates is selected = right
else
if ( ( lordJCheckBox.isSelected() && piratesJCheckBox.isSelected() ))
JOptionPane.showMessageDialog(null, "Thats RIGHT!");
//if others are selected = wrong
else
if ( (lordJCheckBox.isSelected() && faceJCheckBox.isSelected() ))
JOptionPane.showMessageDialog(null, "Thats WRONG");
else
( (faceJCheckBox.isSelected() && piratesJCheckBox.isSelected() ))
JOptionPane.showMessageDialog(null, "Thats WRONG");
// main method
public static void main( String[] args )
Mindboggler application = new Mindboggler();
application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
} // end method main
}// end class -
Class error - cannot resolve symbol "MyDocumentListener"
Hello,
this is a groaner I'm sure, but I don't see the problem.
Newbie-itis probably ...
I'm not concerned with what the class does, but it would be nice for the silly thing to compile!
What the heck am I missing for "MyDocumentListener" ?
C:\divelog>javac -classpath C:\ CenterPanel.java
CenterPanel.java:53: cannot resolve symbol
symbol : class MyDocumentListener
location: class divelog.CenterPanel
MyDocumentListener myDocumentListener = new MyDocumentListener(); // define the listener class
^
CenterPanel.java:53: cannot resolve symbol
symbol : class MyDocumentListener
location: class divelog.CenterPanel
MyDocumentListener myDocumentListener = new MyDocumentListener(); // define the listener class
^
2 errors
package divelog;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.lang.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.filechooser.*;
import javax.swing.text.*;
public class CenterPanel extends JPanel implements ActionListener
{ // Opens class
static private final String newline = "\n";
private JTextArea comments;
private JScrollPane scrollpane;
private JButton saveButton, openButton;
private JLabel whiteshark;
private Box box;
private BufferedReader br ;
private String str;
private JTextArea instruct;
private File defaultDirectory = new File("C://divelog");
private File fileDirectory = null;
private File currentFile= null;
public CenterPanel()
{ // open constructor CenterPanel
setBackground(Color.white);
comments = new JTextArea("Enter comments, such as " +
"location, water conditions, sea life you observed," +
" and problems you may have encountered.", 15, 10);
comments.setLineWrap(true);
comments.setWrapStyleWord(true);
comments.setEditable(true);
comments.setFont(new Font("Times-Roman", Font.PLAIN, 14));
// add a document listener for changes to the text,
// query before opening a new file to decide if we need to save changes.
MyDocumentListener myDocumentListener = new MyDocumentListener(); // define the listener class
comments.getDocument().addDocumentListener(myDocumentListener); // create the reference for the class
// ------ Document listener class -----------
class MyDocumentListener implements DocumentListener {
public void insertUpdate(DocumentEvent e) {
Calculate(e);
public void removeUpdate(DocumentEvent e) {
Calculate(e);
public void changedUpdate(DocumentEvent e) {
private void Calculate(DocumentEvent e) {
// do something here
scrollpane = new JScrollPane(comments);
scrollpane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
saveButton = new JButton("Save Comments", new ImageIcon("images/Save16.gif"));
saveButton.addActionListener( this );
saveButton.setToolTipText("Click this button to save the current file.");
openButton = new JButton("Open File...", new ImageIcon("images/Open16.gif"));
openButton.addActionListener( this );
openButton.setToolTipText("Click this button to open a file.");
whiteshark = new JLabel("", new ImageIcon("images/gwhite.gif"), JLabel.CENTER);
Box boxH;
boxH = Box.createHorizontalBox();
boxH.add(openButton);
boxH.add(Box.createHorizontalStrut(15));
boxH.add(saveButton);
box = Box.createVerticalBox();
box.add(scrollpane);
box.add(Box.createVerticalStrut(10));
box.add(boxH);
box.add(Box.createVerticalStrut(15));
box.add(whiteshark);
add(box);
} // closes constructor CenterPanel
public void actionPerformed( ActionEvent evt )
{ // open method actionPerformed
JFileChooser jfc = new JFileChooser();
// these do not work !!
// -- set the file types to view --
// ExtensionFileFilter filter = new ExtensionFileFilter();
// FileFilter filter = new FileFilter();
//filter.addExtension("java");
//filter.addExtension("txt");
//filter.setDescription("Text & Java Files");
//jfc.setFileFilter(filter);
//Add a custom file filter and disable the default "Accept All" file filter.
jfc.addChoosableFileFilter(new JTFilter());
jfc.setAcceptAllFileFilterUsed(false);
// -- open the default directory --
// public void setCurrentDirectory(File dir)
// jfc.setCurrentDirectory(new File("C://divelog"));
jfc.setCurrentDirectory(defaultDirectory);
jfc.setSize(400, 300);
jfc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
Container parent = saveButton.getParent();
//========================= Test Button Actions ================================
//========================= Open Button ================================
if (evt.getSource() == openButton)
int choice = jfc.showOpenDialog(CenterPanel.this);
File file = jfc.getSelectedFile();
/* a: */
if (file != null && choice == JFileChooser.APPROVE_OPTION)
String filename = jfc.getSelectedFile().getAbsolutePath();
// -- compare the currentFile to the file chosen, alert of loosing any changes to currentFile --
// If (currentFile != filename)
// -- get the current directory name -------
// public File getCurrentDirectory( );
File f=new File(System.getProperty("user.dir"));
fileDirectory = jfc.getCurrentDirectory();
// -- remember the last directory used --
if (defaultDirectory != fileDirectory)
{defaultDirectory = fileDirectory;}
try
{ //opens try
comments.getLineCount( );
// -- clear the old data before importing the new file --
comments.selectAll();
comments.replaceSelection("");
// -- get the new data ---
br = new BufferedReader (new FileReader(file));
while ((str = br.readLine()) != null)
{//opens while
comments.append(str);
} //closes while
} // close try
catch (IOException ioe)
{ // open catch
comments.append(newline +"Open command not successful:" + ioe + newline);
} // close catch
// ---- display the values of the directory variables -----------------------
comments.append(
newline + "The f directory variable contains: " + f +
newline + "The fileDirectory variable contains: " + fileDirectory +
newline + "The defaultDirectory variable contains: " + defaultDirectory );
else
comments.append("Open command cancelled by user." + newline);
} //close if statement /* a: */
//========================= Save Button ================================
} else if (evt.getSource() == saveButton)
int choice = jfc.showSaveDialog(CenterPanel.this);
if (choice == JFileChooser.APPROVE_OPTION)
File fileName = jfc.getSelectedFile();
// -- get the current directory name -------
// public File getCurrentDirectory( );
File f=new File(System.getProperty("user.dir"));
fileDirectory = jfc.getCurrentDirectory();
// -- remember the last directory used --
if (defaultDirectory != fileDirectory)
{defaultDirectory = fileDirectory;}
//check for existing files. Warn users & ask if they want to overwrite
for(int i = 0; i < fileName.length(); i ++) {
File tmp = null;
tmp = (fileName);
if (tmp.exists()) // display pop-up alert
//public static int showConfirmDialog( Component parentComponent,
// Object message,
// String title,
// int optionType,
// int messageType,
// Icon icon);
int confirm = JOptionPane.showConfirmDialog(null,
fileName + " already exists on " + fileDirectory
+ "\n \nContinue?", // msg
"Warning! Overwrite File!", // title
JOptionPane.OK_CANCEL_OPTION, // buttons displayed
// JOptionPane.ERROR_MESSAGE
// JOptionPane.INFORMATION_MESSAGE
// JOptionPane.PLAIN_MESSAGE
// JOptionPane.QUESTION_MESSAGE
JOptionPane.WARNING_MESSAGE,
null);
if (confirm != JOptionPane.YES_OPTION)
{ //user cancels the file overwrite.
try {
jfc.cancelSelection();
break;
catch(Exception e) {}
// ----- Save the file if everything is OK ----------------------------
try
{ // opens try
BufferedWriter bw = new BufferedWriter(new FileWriter(fileName));
bw.write(comments.getText());
bw.flush();
bw.close();
comments.append( newline + newline + "Saving: " + fileName.getName() + "." + newline);
break;
} // closes try
catch (IOException ioe)
{ // open catch
comments.append(newline +"Save command unsuccessful:" + ioe + newline);
} // close catch
} // if exists
} //close for loop
else
comments.append("Save command cancelled by user." + newline);
} // end-if save button
} // close method actionPerformed
} //close constructor CenterPanel
} // Closes class CenterPanelThere is no way to be able to see MyDocumentListener class in the way you wrote. The reason is because MyDocumentListener class inside the constructor itself. MyDocumentListener class is an inner class, not suppose to be inside a constructor or a method. What you need to do is simple thing, just move it from inside the constructor and place it between two methods.
that's all folks
Qusay -
Cannot resolve symbol class graphics
does anyone know what the error
cannot resolve symbol class graphics means?
with this code i can't seem to call the graphics method to draw the line....any reason why?
import javax.swing.*;
import java.*;
public class LineDraw extends JFrame {
public static void main(String[] args) {
LineDraw ld = new LineDraw();
ld.setSize(500,500);
ld.setVisible(true);
ld.enterVariables();
public void init(){
private int x1;
private int x2;
private int y1;
private int y2;
public void paint(Graphics g) {
g.GetGraphics(g);
super.paintComponent(g);
g.drawLine(x1, y1, x2, y2);
public void enterVariables() {
x1 = Integer.parseInt(JOptionPane.showInputDialog("Enter x1:"));
y1 = Integer.parseInt(JOptionPane.showInputDialog("Enter y1:"));
x2 = Integer.parseInt(JOptionPane.showInputDialog("Enter x2:"));
y2 = Integer.parseInt(JOptionPane.showInputDialog("Enter y2:"));
repaint();
}well the exact error message is ...by the way now that i think about it
if the graphics method shoudl not be part of the JFrame class then what method would i use to draw 2D Graphics?
--------------------Configuration: <Default>--------------------
C:\Documents and Settings\c1s5\My Documents\LineDraw.java:21: cannot resolve symbol
symbol : class Graphics
location: class LineDraw
public void paint(Graphics g)
^
1 error
Process completed.
and the exact code is
import javax.swing.*;
import java.*;
public class LineDraw extends JFrame {
public static void main(String[] args) {
LineDraw ld = new LineDraw();
ld.setSize(1024,500);
ld.setVisible(true);
ld.enterVariables();
private int x1;
private int x2;
private int y1;
private int y2;
public void paint(Graphics g)
super.paintComponent(g);
g.drawLine(x1, y1, x2, y2);
public void enterVariables() {
x1 = Integer.parseInt(JOptionPane.showInputDialog("Enter x1:"));
y1 = Integer.parseInt(JOptionPane.showInputDialog("Enter y1:"));
x2 = Integer.parseInt(JOptionPane.showInputDialog("Enter x2:"));
y2 = Integer.parseInt(JOptionPane.showInputDialog("Enter y2:"));
repaint();
} -
Cannot resolve symbol error even with class imported
Hi
I'm trying to print out a java.version system property but keep getting a
cannot resolve symbol error
symbol: class getProperty
location: class java.lang.System
I've looked at the API and getProperty() is a method of lang.System
Can anyone throw any light?
thanks
import java.lang.System;
class PropertiesTest {
public static void main(String[] args) {
String v = new System.getProperty("java.version");
System.out.println(v);
}Thanks Jos
It compiles but I now get a runtime error
Exception in thread "main"
java.lang.NoClassDefFoundError:PropertiesTest
What do you reckon is the problem?
thanks
java -cp .;<any other directories or jars>
YourClassNameYou get a NoClassDefFoundError message because the
JVM (Java Virtual Machine) can't find your class. The
way to remedy this is to ensure that your class is
included in the classpath. The example assumes that
you are in the same directory as the class you're
trying to run.I know it's a bad habit but I've put this file (PropertiesTest.java) and the compiled class (PropertiesTest.class) both in my bin folder which contains the javac compiler -
Cannot resolve symbol java.awt.graphics
// DrawRectangleDemo.java
import java.awt.*;
import java.lang.Object;
import java.applet.Applet;
public class DrawRectangleDemo extends Applet
public void paint (Graphics g)
// Get the height and width of the applet's drawing surface.
int width = getSize ().width;
int height = getSize ().height;
int rectWidth = (width-50)/3;
int rectHeight = (height-70)/2;
int x = 5;
int y = 5;
g.drawRect (x, y, rectWidth, rectHeight);
g.drawString ("drawRect", x, rectHeight + 30);
x += rectWidth + 20;
g.fillRect (x, y, rectWidth, rectHeight);
// Calculate a border area with each side equal tp 25% of
// the rectangle's width.
int border = (int) (rectWidth * 0.25);
// Clear 50% of the filled rectangle.
g.clearRect (x + border, y + border,
rectWidth - 2 * border, rectHeight - 2 * border);
g.drawString ("fillRect/clearRect", x, rectHeight + 30);
x += rectWidth + 20;
g.drawRoundRect (x, y, rectWidth, rectHeight, 15, 15);
g.drawString ("drawRoundRect", x, rectHeight + 30);
x=5;
y += rectHeight + 40;
g.setColor (Color.yellow);
for (int i = 0; i < 4; i++)
g.draw3DRect (x + i * 2, y + i * 2,
rectWidth - i * 4, rectHeight - i * 4, false);
g.setColor (Color.black);
g.drawString ("draw3DRect", x, y, + rectHeight + 25);
x += rectWidth + 20;
g.setColor (Color.yellow);
g.fill3DRect (x, y, rectWidth, rectHeight, true);
g.setColor (Color.black);
g.drawString ("fill3DRect", x, y, + rectHeight + 25);
Help me with this codes. I typed correctly but there still errors.
--------------------Configuration: JDK version 1.3.1 <Default>--------------------
D:\Program Files\Xinox Software\JCreator LE\MyProjects\DrawRectangleDemo.java:56: cannot resolve symbol
symbol : method drawString (java.lang.String,int,int,int)
location: class java.awt.Graphics
g.drawString ("draw3DRect", x, y, + rectHeight + 25);
^
D:\Program Files\Xinox Software\JCreator LE\MyProjects\DrawRectangleDemo.java:64: cannot resolve symbol
symbol : method drawString (java.lang.String,int,int,int)
location: class java.awt.Graphics
g.drawString ("fill3DRect", x, y, + rectHeight + 25);
^
2 errors
Process completed.
-------------------------------------------------------------------------------------------------------------------------------cannot resolve symbol
symbol : method drawString (java.lang.String,int,int,int)
This is telling you that you are trying to invoke the drawString() method with 4 parameters: String, int, int, int
If you look at the API the drawString() method need 3 parameters: String, int, int - so you have an extra int
location: class java.awt.Graphics
g.drawString ("draw3DRect", x, y, + rectHeight + 25);
Now is you look at your code you will find that you have 3 ',' in you method call. (I don't think you want the ',' after the y. -
Compiling error - cannot resolve symbol
Hi,
I am working on writing out this basic code for a project. When I compile, I get an error "Cannot resolve symbol" for the gpa variable. Please help!
My intention is to use the hours and points from the crHours and nbrPoints methods, and use them to calculate GPA in the grPtAvg method:
public class Student
public static void main(String[]args)
idNum();
crHours();
nbrpoints();
gpa = grPtAvg(hours, points);
System.out.println("Student's GPA is " + gpa);
public static void idNum()
int id = 2520;
System.out.println("Student's ID is " + id);
public static float crHours()
float hours = 5;
System.out.println("Student's credit hours are " + hours);
return hours;
public static float nbrpoints()
float points = 22;
System.out.println("Student's earned points are " + points);
return points;
public static float grPtAvg(float hours, float points)
float gpa;
gpa = points / hours;
System.out.println("Student's computed GPA is " + gpa);
return gpa;That's because you're doing the same thing (in a somewhat different way) with those.
The variables: hours and points have already been returned to main methd, right?Yes, but then the main method ignores them.
So, they should be available at this point in the code, is that right?Available in the sense that you can read them, but not in the sense that there are hours and points variables within scope in the main method.
You want to do this:
public static void main(String[] args) {
idNum();
float hours = crHours();
float points = nbrpoints();
//create a new float
float myComputetdGpa = grPtAvg(hours, points);
System.out.println("Student's GPA is " + myComputedGpa);
}
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