"cannot find symbol" error in compiling
I'm just begining to learn Java and I have the "Teach yourself Java in 21 Days" book. I can't get the code to work and every time I compile the VolcanoRobot.java, I get this error:
"VolcanoRobot.java:25: cannot find symbol
symbol : method showAttributes()
location: class VolcanoRobot
dante.showAttributes();
^
VolcanoRobot.java:28: cannot find symbol
symbol : method showAttributes()
location: class VolcanoRobot
dante.showAttributes();
^
VolcanoRobot.java:31: cannot find symbol
symbol : method showAttributes()
location: class VolcanoRobot
dante.showAttributes();
^
VolcanoRobot.java:34: cannot find symbol
symbol : method showAttributes()
location: class VolcanoRobot
dante.showAttributes();
^
4 errors"
and here is my code:
"class VolcanoRobot {
String status;
int speed;
float temperature;
void checkTemperature() {
if (temperature > 700) {
status = "returning home";
speed = 8;
void showAtrributes() {
System.out.println("Status: " +status);+
+System.out.println("Speed: "+ speed);
System.out.println("Temperature: " + temperature);
public static void main(String[] arguments) {
VolcanoRobot dante = new VolcanoRobot();
dante.status = "exploring";
dante.speed = 2;
dante.temperature = 510;
dante.showAttributes();
System.out.println("Increasing speed to 3.");
dante.speed = 3;
dante.showAttributes();
System.out.println("Changing temperature to 670.");
dante.temperature = 670;
dante.showAttributes();
System.out.println("Checking the temperature.");
dante.checkTemperature();
dante.showAttributes();
}"
Use code tags when you post code.
Post the code that produces the error - the code that you posted does not.
The code you posted has the following errors
VolcanoRobot.java:18: ')' expected
System.out.println("Status: " status);
^
VolcanoRobot.java:18: illegal start of expression
System.out.println("Status: " status);
^
VolcanoRobot.java:19: ')' expected
System.out.println("Speed: " speed);
^
VolcanoRobot.java:19: illegal start of expression
System.out.println("Speed: " speed);Once those errors are fixed you get the errors that you posted.
VolcanoRobot.java:25: cannot find symbolThe number in that line (25) tells you the exact line where the error appeared. Although sometimes the cause might be a line before that.
It also tells you specifically what it doesn't like. In this case 'showAttributes'.
Hint: So look at that line carefully. And look at the method carefully that that is supposed to call. They are not the same.
Similar Messages
-
Cannot find symbol error when compiling in different packages
Hey all,
I'm trying to divide my project into a sensible hierarchy. This is what I want:
MyProject
MyProject/src ................................. where all the source files are (no further directories)
MyProject/classes
MyProject/classes/Main.class
MyProject/classes/classes2 ................ sorry for not being creative XD
MyProject/classes/classes2/Age.classNow, Age uses Main, and this is where the trouble is. I'm using javac directly to compile Age, and this is how I'm doing it:
//from MyProject
javac -cp classes src/Age.javaAnd I get this error:
bla bla bla...cannot find symbol
symbol : variable Main
location: class classes2.Age
years = (byte)(Main.year - m.getYear());
^Main is already compiled and in place.
Also, this is how Age.java starts:
package classes2;
public class Age
{...etcI'm using JCreator as an IDE (and using it's own build function, the same error occurs, which is why I tried directly compiling the file).
Why can't javac find Main.class? I tried searching Google, but my particular problem didn't seem to crop up.
Hope I provided enough information, and ask if more is needed.
Many thanks :)If Main is not in a package (which it appears not to be), then it cannot be referenced by any class that is in a package. If Main is in a package, then you'll need to refer to it by it's fully-qualified name (or import it as such) if it's not in the same package as the class that's referring to it, and Main.class will have to be in a directory that corresponds to its package.
Also, though the compiler may not require it, your source code directory structure should match your package hierarchy. -
"cannot find symbol" error while compiling the RMI
I am trying to implement a simple RMI.
I have the following :
1. HelloInterface which has the SayHello method defined.
2. HelloImpl which has the implementation of Say Hello
3. Server code
4. Client code
the HelloInterface compiles properly.
but when i say javac HelloImpl
package rmisample;
import java.rmi.*;
import java.rmi.server.UnicastRemoteObject;
import java.rmi.RemoteException;
public class HelloImpl extends UnicastRemoteObject implements HelloInterface{ --> this is where i get the error
/** Creates a new instance of HelloImpl */
public HelloImpl()throws RemoteException {
super();
public String SayHello(String s) throws RemoteException
return "hello" +s;
I get the following error:
C:\Myjava\RMISample\src\rmisample>javac HelloImpl.java
HelloImpl.java:18: cannot find symbol
symbol: class HelloInterface
public class HelloImpl extends UnicastRemoteObject implements HelloInterface{
All 4 files are in the same directory.
Am not sure what is going wrong and am new to this.
Edited by: topcatin on Sep 14, 2007 6:52 AMThe problem is probably that the compiler can't find the file with that class definition.
Try changing your javac call so that is starts off
javac -classpath .
The dot is important!
If it works, then go read up on classpaths. -
Cannot find symbol error when compiling from cmd
When compile and running program from Eclipse 3.3 everything works fine, but when trying to compile from cmd I get this error:
C:\TEMP\1>javac A.java
A.java:38: cannot find symbol
symbol : class SwingWorker
location: package javax.swing
import javax.swing.SwingWorker;
^
A.java:48: cannot find symbol
symbol : class SwingWorker
location: class A
class Task extends SwingWorker {
^
A.java:109: cannot find symbol
symbol : method addPropertyChangeListener(A)
location: class A.Task
task.addPropertyChangeListener(this);
^
A.java:110: cannot find symbol
symbol : method execute()
location: class A.Task
task.execute();
^
java -version get back: java version "1.6.0_14"....
now, if i copy .class file that Eclipse made and just execute thet .class file from cmd everything works fine.
here is the code, but i think that problems is somwhere else. i tried to serach on google, but... :(
import java.awt.BorderLayout;
import java.awt.Cursor;
import java.awt.Insets;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingWorker;
public class A extends JPanel implements ActionListener, PropertyChangeListener {
private JProgressBar progressBar;
private JButton startButton;
private JTextArea taskOutput;
private Task task;
class Task extends SwingWorker {
* Main task. Executed in background thread.
// @Override
public Void doInBackground() {
System.out.println("test");
return null;
* Executed in event dispatching thread
// @Override
public void done() {
Toolkit.getDefaultToolkit().beep();
startButton.setEnabled(true);
setCursor(null); //turn off the wait cursor
taskOutput.append("Done!\n");
public A() {
super(new BorderLayout());
//Create the demo's UI.
startButton = new JButton("Start");
startButton.setActionCommand("start");
startButton.addActionListener(this);
progressBar = new JProgressBar(0, 100);
progressBar.setValue(0);
progressBar.setStringPainted(true);
taskOutput = new JTextArea(25, 50);
taskOutput.setMargin(new Insets(5,5,5,5));
taskOutput.setEditable(false);
JPanel panel = new JPanel();
panel.add(startButton);
panel.add(progressBar);
add(panel, BorderLayout.PAGE_START);
add(new JScrollPane(taskOutput), BorderLayout.CENTER);
setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
* Invoked when the user presses the start button.
public void actionPerformed(ActionEvent evt) {
startButton.setEnabled(false);
setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
//Instances of javax.swing.SwingWorker are not reusuable, so
//we create new instances as needed.
task = new Task();
task.addPropertyChangeListener(this);
task.execute();
* Invoked when task's progress property changes.
public void propertyChange(PropertyChangeEvent evt) {
if ("progress" == evt.getPropertyName()) {
int progress = (Integer) evt.getNewValue();
progressBar.setValue(progress);
// taskOutput.append(String.format("Completed %d%% of task.\n", task.getProgress()));
* Create the GUI and show it. As with all GUI code, this must run
* on the event-dispatching thread.
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("Veritas Backup");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
JComponent newContentPane = new A();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}thank you very much!!!!Perhaps you are running an older version of javac. What do you get with "javac -version" or try compiling with the full path to jdk 1.6.0_14/bin/javac.
-
Unable to compile "SerialDemo.java", many "cannot find symbols" errors
I have all the correct files in their respective directory.
comm.jar in jre\lib\bin,
javax.comm.properties in jre\lib
win32com.dll in jre\bin
I extracted all the whole of SerialDemo into one folder and started compiling from there. But it doesn't work. I keep getting many "cannot find symbol" errors. They are usually referred to by:
SerialParameters
SerialConnection
AlertDialog
SerialConnectionException
SerialDemo.java is not edited and was compiled directly. All of my files are in one folder (AlertDialog.java compiles fine and is in the same folder, etc)
I was wondering what might be the cause of it. I'm currently using a Windows XP Service Pack 2, IBM P3 Laptop. I was reading "http://forum.java.sun.com/thread.jspa?threadID=674514&messageID=3941560"
And I found out it works fine on Win2k OS. Why is this so? I'm getting the exact same error as he stated on his last post and I tried looking for a solution and decided to turn to you guys. I'd really appreciate some help, if any. Thanks in advance.I followed the PlatformSpecific. I realised that I
added one for JRE when it wasn't required. The
problem was solved.
Thank you so much, the both of you. My stupid mistake
caused quite a bit of havoc. I apologise.No need to apologise; The confusing part is that when you download
a jre, that's just what your get: a jre, but when you download the jdk
you not just get the jdk and the jre but you get a second jre with them,
stored under the jdk directory.
To the programmer that second jre is useless, it is used internally by
the jdk tools.
kind regards,
Jos -
Cannot find symbol error.. really stuck.
I have a class named Rectangle.java. It is in a package "Geometry" together with Point.java and Line.java. But when I try to use Rectangle.java in my main program, MyRect.java, it gives me a "cannot find symbol" error, particularly the methods and sometimes the variables. I tried compiling just my Rectangle class and it compiled fine.. And I tried the Line and Point classes on another program and it works fine... well probably because the Line and Point classes are from a book(Ivor Horton's Beginning Java 2).. I am just starting out in Java. :)
Rectangle.java
package Geometry;
public class Rectangle{
public Point[] corner = new Point[4];
public String name;
public Rectangle(){
corner[0].setPoints(0,0);
corner[1].setPoints(1,0);
corner[2].setPoints(0,1);
corner[3].setPoints(1,1);
name = new String("Unknown");
public Rectangle(double point1_x,double point1_y,double point2_x, double point2_y, String Name){
corner[0].setPoints(point1_x, point1_y);
corner[3].setPoints(point2_x, point2_y);
corner[1].setPoints(point2_x, point1_y);
corner[2].setPoints(point1_x, point2_y);
name = new String(Name);
public Rectangle(final Rectangle oldRect, String Name){
corner[0] = oldRect.corner[0];
corner[3] = oldRect.corner[3];
corner[1] = oldRect.corner[1];
corner[2] = oldRect.corner[2];
name = new String(Name);
public double getWidth(){
return corner[0].distance(corner[1]);
public static void printRectangle(final Rectangle rect){
for(int i= 0;i<4;i++){
System.out.println("Corner"+(i+1)+" X: "+rect.corner.getX()+" Corner"+(i+1)+" Y: "+rect.corner[i].getY());
System.out.println();
public String toString(){
return ("Name: "+name);
}MyRect.java
import Geometry.*;
public class MyRect{
public static void main(String[] args){
Rectangle myRect = new Rectangle(0,0,2,1);
Rectangle copyRect = new Rectangle(myRect);
printRectangle(myRect);
double width = myRect.getWidth();
}and the errors:
MyRect.java:4: cannot find symbol
symbol : constructor Rectangle(double,double,double,double,java.lang.String)
location: class Rectangle
Rectangle myRect = new Rectangle(0.0,0.0,2.0,1.0,"My Rectangle")
^
MyRect.java:9: cannot find symbol
symbol : variable name
location: class Rectangle
System.out.println(myRect.name);
^
2 errorsAre you sure you have posted the whole content of MyRect.java
import Geometry.*;
public class MyRect{
public static void main(String[] args){
Rectangle myRect = new Rectangle(0,0,2,1);
Rectangle copyRect = new Rectangle(myRect);
printRectangle(myRect);
double width = myRect.getWidth();
}I don't see the following error line in the code you have given.
MyRect.java:4: cannot find symbol
symbol : constructor Rectangle(double,double,double,double,java.lang.String)
location: class Rectangle
Rectangle myRect = new Rectangle(0.0,0.0,2.0,1.0,"My Rectangle")
^
MyRect.java:9: cannot find symbol
symbol : variable name
location: class Rectangle
System.out.println(myRect.name);
^
2 errors -
Cannot find symbol error -- array fill from text file
When I compile my program I receive a cannot find symbol error for the variable ayears. I thought this snippet would fill the array ayears that could be accessed later in the program but I am getting the error message from my buildGUI() class. What could I have done wrong?
(my file options.txt contains data separated by a comma and a space)
public void getOption(){
InputStream istream;
File options = new File("options.txt");
istream = new FileInputStream(options);
try {
StringBuffer sbuff = new StringBuffer();
BufferedReader inbuff = new
BufferedReader(new FileReader(options));
String line = "";
while((line = inbuff.readLine()) != null) {
System.out.println(line);
sbuff.append(line);
inbuff.close();
String fileData = sbuff.toString();
String[] splitData = fileData.split(", ");
String[] ayears = new String[splitData.length];
catch(Exception e){
JOptionPane.showMessageDialog(null,
"Could not find specified file", "Error Message",
JOptionPane.ERROR_MESSAGE);
}Okay -- that helped. I've avoided that error -- now on to the next one, why won't my array fill? It's going to be a long night.
Thanks for the help. -
Need help with class info and cannot find symbol error.
I having problems with a cannot find symbol error. I cant seem to figure it out.
I have about 12 of them in a program I am trying to do. I was wondering if anyone could help me out?
Here is some code I am working on:
// This will test the invoice class application.
// This program involves a hardware store's invoice.
//import java.util.*;
public class InvoiceTest
public static void main( String args[] )
Invoice invoice1 = new Invoice( "1234", "Hammer", 2, 14.95 );
// display invoice1
System.out.println("Original invoice information" );
System.out.println("Part number: ", invoice1.getPartNumber() );
System.out.println("Description: ", invoice1.getPartDescription() );
System.out.println("Quantity: ", invoice1.getQuantity() );
System.out.println("Price: ", invoice1.getPricePerItem() );
System.out.println("Invoice amount: ", invoice1.getInvoiceAmount() );
// change invoice1's data
invoice1.setPartNumber( "001234" );
invoice1.setPartDescription( "Yellow Hammer" );
invoice1.setQuantity( 3 );
invoice1.setPricePerItem( 19.49 );
// display invoice1 with new data
System.out.println("Updated invoice information" );
System.out.println("Part number: ", invoice1.getPartNumber() );
System.out.println("Description: ", invoice1.getPartDescription() );
System.out.println("Quantity: ", invoice1.getQuantity() );
System.out.println("Price: ", invoice1.getPricePerItem() );
System.out.println("Invoice amount: ", invoice1.getInvoiceAmount() );
and that uses this class file:
public class Invoice
private String partNumber;
private String partDescription;
private int quantityPurchased;
private double pricePerItem;
public Invoice( String ID, String desc, int purchased, double price )
partNumber = ID;
partDescription = desc;
if ( purchased >= 0 )
quantityPurchased = purchased;
if ( price > 0 )
pricePerItem = price;
public double getInvoiceAmount()
return quantityPurchased * pricePerItem;
public void setPartNumber( String newNumber )
partNumber = newNumber;
System.out.println(partDescription+" has changed to part "+newNumber);
public String getPartNumber()
return partNumber;
public void setDescription( String newDescription )
System.out.printf("%s now refers to %s, not %s.\n",
partNumber, newDescription, partDescription);
partDescription = newDescription;
public String getDescription()
return partDescription;
public void setPricePerItem( double newPrice )
if ( newPrice > 0 )
pricePerItem = newPrice;
public double getPricePerItem()
return pricePerItem;
Any tips for helping me out?System.out.println("Part number:
"+invoice1.getPartNumber;
The + sign will concatenate invoice1.getPartNumber()
after "Part number: " forming only one String.I added the plus sign and it gives me more errors:
C:\>javac InvoiceTest.java
InvoiceTest.java:16: operator + cannot be applied to java.lang.String
System.out.println("Part number: ", + invoice1.getPartNumber() );
^
InvoiceTest.java:17: cannot find symbol
symbol : method getPartDescription()
location: class Invoice
System.out.println("Description: ", + invoice1.getPartDescription() );
^
InvoiceTest.java:17: cannot find symbol
symbol : method println(java.lang.String,int)
location: class java.io.PrintStream
System.out.println("Description: ", + invoice1.getPartDescription() );
^
InvoiceTest.java:18: cannot find symbol
symbol : method getQuantity()
location: class Invoice
System.out.println("Quantity: ", + invoice1.getQuantity() );
^
InvoiceTest.java:18: cannot find symbol
symbol : method println(java.lang.String,int)
location: class java.io.PrintStream
System.out.println("Quantity: ", + invoice1.getQuantity() );
^
InvoiceTest.java:19: cannot find symbol
symbol : method println(java.lang.String,double)
location: class java.io.PrintStream
System.out.println("Price: ", + invoice1.getPricePerItem() );
^
InvoiceTest.java:20: cannot find symbol
symbol : method println(java.lang.String,double)
location: class java.io.PrintStream
System.out.println("Invoice amount: ", + invoice1.getInvoiceAmount() );
^
InvoiceTest.java:24: cannot find symbol
symbol : method setPartDescription(java.lang.String)
location: class Invoice
invoice1.setPartDescription( "Yellow Hammer" );
^
InvoiceTest.java:25: cannot find symbol
symbol : method setQuantity(int)
location: class Invoice
invoice1.setQuantity( 3 );
^
InvoiceTest.java:30: operator + cannot be applied to java.lang.String
System.out.println("Part number: ", + invoice1.getPartNumber() );
^
InvoiceTest.java:31: cannot find symbol
symbol : method getPartDescription()
location: class Invoice
System.out.println("Description: ", + invoice1.getPartDescription() );
^
InvoiceTest.java:31: cannot find symbol
symbol : method println(java.lang.String,int)
location: class java.io.PrintStream
System.out.println("Description: ", + invoice1.getPartDescription() );
^
InvoiceTest.java:32: cannot find symbol
symbol : method getQuantity()
location: class Invoice
System.out.println("Quantity: ", + invoice1.getQuantity() );
^
InvoiceTest.java:32: cannot find symbol
symbol : method println(java.lang.String,int)
location: class java.io.PrintStream
System.out.println("Quantity: ", + invoice1.getQuantity() );
^
InvoiceTest.java:33: cannot find symbol
symbol : method println(java.lang.String,double)
location: class java.io.PrintStream
System.out.println("Price: ", + invoice1.getPricePerItem() );
^
InvoiceTest.java:34: cannot find symbol
symbol : method println(java.lang.String,double)
location: class java.io.PrintStream
System.out.println("Invoice amount: ", + invoice1.getInvoiceAmount() );
^
16 errors -
Help! Getting the cannot find symbol error.
Hello everyone. I have gone throught my whole program and I am still getting a cannot find symbol error. What does this error mean exactly? Here is the code below. I am trying to color a background using a comobox method.
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.EtchedBorder;
import javax.swing.border.TitledBorder;
import java.awt.GridLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JComboBox;
public class ComboboxFrame extends JFrame
public ComboboxFrame()
colorPanel = new JPanel();
colorPanel.setPreferredSize(new Dimension(PANEL_WIDTH, PANEL_HEIGHT));
getContentPane().add(colorPanel, BorderLayout.CENTER);
class ChoiceListener implements ActionListener
public void actionPerformed(ActionEvent event)
setbackgroundColor();
listener = new ChoiceListener();
createControlPanel();
setbackgroundColor();
pack();
private void createControlPanel()
JPanel colorPanel = createComboBox();
JPanel controlPanel = new JPanel();
controlPanel.setLayout(new GridLayout(1, 1));
controlPanel.add(colorPanel);
getContentPane().add(
controlPanel, BorderLayout.SOUTH);
public JPanel createComboBox()
colorCombo = new JComboBox();
colorCombo.addItem("Red");
colorCombo.addItem("Green");
colorCombo.addItem("Blue");
colorCombo.setEditable(true);
colorCombo.addActionListener(listener);
JPanel panel = new JPanel();
panel.add(colorCombo);
return panel;
public void setbackgroundColor()
String color = (String)colorCombo.getSelectedItem();
colorPanel.setbackgroundColor(new backgroungColor(color));
colorPanel.repaint();
private JPanel colorPanel;
private static final int PANEL_WIDTH = 300;
private static final int PANEL_HEIGHT = 300;
private JComboBox colorCombo;
private ActionListener listener;
}The line with the error is: colorPanel.setbackgroundColor(new backgroungColor(color));
Here is the second file
import javax.swing.JFrame;
public class backgroundTest
public static void main(String[] args)
JFrame frame = new comboboxFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.show();
}Any help would be appreciated. Thank youHello everyone. I have gone throught my whole
program and I am still getting a cannot find symbol
error. "Symbol" here means variable or method name (or maybe class name, but I think it will specifically bitch about classnames in that case).
String foo = "foo";
System.out.println(zoo); // no such variable as zoo. So...
colorPanel.setbackgroundColor(new backgroungColor(color));Looks like colorPanel or setbackgroundColor(new backgroungColor doesn't exist.
Note that spelling and capitalization count. Java's really anal that way. -
Help - cannot find symbol error
Can someone help me? I am getting "cannot find symbol" error in my code and cannot figure out why. Here is my code:
public class toyInventory
private String[] toyInventory = {"ball", "bat", "bear", "car", "doll", "game", "glove", "playstation", "train"};
private int[] nineArray = {0,0,0,0,0,0,0,0};
int invItems = 0;
public void countToy()
String orderInput[] = {"bear", "train", "car", "ball", "doll", "ball", "train", "doll", "game", "train", "bear", "doll", "train", "car", "ball", "bat", "glove", "bat", "b", "doll", "bear", "ball", "doll", "bat", "car", "glove", "train", "doll", "bear"};
int noMatch;
for(int a = 0; a < orderInput.length; a++)
noMatch = 0;
for(int b = 0; b < toyInventory.length; b++)
if(orderInput[a] == toyInventory)
noMatch = 1;
break;
if(noMatch == 0)
invItems = 1;
public void printItems()
for(int c = 0; c < toyInventory.length; c++)
if (countToy[c] > 4)<-------- cannot find symbol error here
System.out.print("*");
System.out.print(toyInventory[c] + "\t" + countToy[c] + "\n"); <----cannot find symbol error here also
System.out.print("The number of invalid items in the order is" + invItems);
public static void main( String[] args)
toyInventory collection = new toyInventory ();
collection.countToy();
collection.printItems();public void countToy()
String orderInput[] = {"bear", "train", "car", "ball", "doll", "ball", "train", "doll", "game", "train", "bear", "doll", "train", "car", "ball", "bat", "glove", "bat", "b", "doll", "bear", "ball", "doll", "bat", "car", "glove", "train", "doll", "bear"};In the above code you have declared countToy() as method and while in the below lines you are calling countToy[] as an array. So please check that...
if (countToy[c] > 4)<-------- cannot find symbol error here
System.out.print("*");
System.out.print(toyInventory[c] + "\t" + countToy[c] + "\n"); <----cannot find symbol error here also
} -
Cannot find symbol error. don't know why
Hello, I'm trying to write a button bean in the shape of a triangle but netbeans keeps throwing up a cannot find symbol error at my g.fillPolygon line. I've declared the number of sides and x and y coords.
Any ideas as to why this is happening would be greatly appreciated.
Here's the code:
package trianglebutton;
import java.util.*;
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
import java.io.*;
public class TriangleButtonBean extends JButton implements Serializable
private TriangleButtonBean graphicPolygon;
private Color buttonColour;
private Color textColour;
private String caption;
private int sides = 3;
private int size = 30;
private int centerX = 100;
private int centerY = 100;
public TriangleButtonBean()
super();
setPreferredSize(new Dimension(50,50));
setBorder(null);
buttonColour = Color.red;
textColour = Color.black;
caption = "";
public TriangleButtonBean(String acaption)
super();
setPreferredSize(new Dimension(50,50));
setBorder(null);
caption = acaption;
public void paintComponent(Graphics g)
String astring;
super.paintComponent(g);
g.setColor(buttonColour);
int centerX = graphicPolygon.getCenterX(); //Invoking getCenterX method
int centerY = graphicPolygon.getCenterY(); //Invoking getCenterY method
//int Xcoordinates [] = graphicPolygon.getPolygonXCoordinates(sides,size);
//int Ycoordinates [] = graphicPolygon.getPolygonYCoordinates(sides,size);
g.drawPolygon(centerX,centerY, sides); //Draw polygon using xcoord,ycoord and number of sides
g.fillPolygon(centerX,centerY, sides); //Fill poly
g.setColor(textColour);
if (caption.length() > 1)
astring = caption.substring(0,1);
else
astring = caption;
g.drawString(astring,22,27);
public void setButtonColour(Color acolour)
buttonColour = acolour;
repaint();
public Color getButtonColour()
return buttonColour;
public void setTextColour(Color acolour)
textColour = acolour;
repaint();
public Color getTextColour()
return textColour;
public void setCaption(String acaption)
caption = acaption;
repaint();
public String getCaption()
return caption;
// public void setCenterX(int xcoords)
// centerX = xcoords;
public int getCenterX()
return centerX;
// public void setCenterY(int ycoords)
// centerY = ycoords;
public int getCenterY()
return centerY;
public static void main(String[] args){
TriangleButtonBean agui = new TriangleButtonBean();
} // End of classPlease READ, STUDY, and UNDERSTAND the error messages, they are telling you exactly what the problem is:
. . .\TriangleButtonBean.java:56: cannot find symbol
symbol : method drawPolygon(int,int,int)
location: class java.awt.Graphics
g.drawPolygon(centerX,centerY, sides); //Draw polygon using xcoord,ycoord and number of sides
^
. . .\TriangleButtonBean.java:57: cannot find symbol
symbol : method fillPolygon(int,int,int)
location: class java.awt.Graphics
g.fillPolygon(centerX,centerY, sides); //Fill poly
^
2 errors
Process javac exited with code 1In both cases the messages ar telling you that the methods
drawPolygon(int,int,int)
method fillPolygon(int,int,int)
can't be found in java.awt.Graphics
And if you look at the documentation, you see that is indeed the problem - the first two arguments are int arrrays, not int.
Fix the method signature or use something else. -
"Cannot find Symbol" error message
I have a "cannot find symbol" error message on line 5 below in
the driver class.
Thank you for your assistance
1 public class GameLauncher
2 {
3 public static void main(String[] args)
4 {
5 GuessGame game = new GuessGame();
6 game.startGame();
7 }
8}
public class GuessGame
public void startGame()
Player p1;
Player p2;
Player p3;
int guessp1 = 0;
int guessp2 = 0;
int guessp3 = 0;
boolean p1isRight = false;
boolean p2isRight = false;
boolean p3isRight = false;
int targetNumber = (int) (Math.random() * 10);
System.out.println(" I'm thinking of a number between 0 and 9....");
while(true)
p1.guess();
p2.guess();
p3.guess();
guessp1 = p1.number;
System.out.println("Player one guessed " + guessp1);
guessp2 = p2.number;
System.out.println("Player two guessed " + guessp2);
guessp3 = p3.number;
System.out.println("Player three guessed " + guessp3);
if (guessp1 == targetNumber)
p1isRight = true;
if (guessp2 == targetNumber)
p2isRight = true;
if (guessp3 == targetNumber)
p3isRight = true;
if ( p1isRight || p2isRight || p3isRight)
System.out.println("We have a winner ! ");
System.out.println("Player one got it right? " + p1isRight);
System.out.println("Player two got it right? " + p2isRight);
System.out.println("Player three got it right? " + p3isRight);
System.out.println("Game is over ! ");
break; //game is over so break out of loop
else
//we must keep going because no one guessed the number !
System.out.println(" Players will have to try again ! ");
} // end of if/else
} // end of loop
} // end of startGame() method
} //end of class
public class Player
int number = 0; // the guess is stored here
public void guess()
System.out.println(" I'm guessing " + number);
---------------------------------------------------------------Thank you . You were right . I didn't set up the classes correctly.
I corrected a few other errors and the program runs ok !
Below is the corrected code and the output
public class GameLauncher
public static void main(String[] args)
GuessGame game = new GuessGame();
game.startGame();
/* One possible set of output is
I'm thinking of a number between 0 and 3....
I'm guessing 1
I'm guessing 3
I'm guessing 0
Player one guessed 1
Player two guessed 3
Player three guessed 0
We have a winner !
Player one got it right? true
Player two got it right? false
Player three got it right? false
Game is over !
public class Player
int number = 0; // the guess is stored here
public void guess()
number = (int)(Math.random() * 4);
System.out.println(" I'm guessing " + number);
public class GuessGame
public void startGame()
int x = 0;
Player p1 = new Player();
Player p2 = new Player();
Player p3 = new Player();
int guessp1 = 0;
int guessp2 = 0;
int guessp3 = 0;
boolean p1isRight = false;
boolean p2isRight = false;
boolean p3isRight = false;
int targetNumber = (int) (Math.random() * 4);
System.out.println("\n I'm thinking of a number between 0 and 3....\n");
while(x <5)
p1.guess();
p2.guess();
p3.guess();
guessp1 = p1.number;
System.out.println("\nPlayer one guessed " + guessp1);
guessp2 = p2.number;
System.out.println("Player two guessed " + guessp2);
guessp3 = p3.number;
System.out.println("Player three guessed " + guessp3);
if (guessp1 == targetNumber)
p1isRight = true;
if (guessp2 == targetNumber)
p2isRight = true;
if (guessp3 == targetNumber)
p3isRight = true;
if ( p1isRight || p2isRight || p3isRight)
System.out.println("\nWe have a winner ! ");
System.out.println("Player one got it right? " + p1isRight);
System.out.println("Player two got it right? " + p2isRight);
System.out.println("Player three got it right? " + p3isRight);
System.out.println("Game is over ! ");
break; //game is over so break out of loop
else
//we must keep going because no one guessed the number !
System.out.println(" Players will have to try again ! ");
} // end of if/else
x = x + 1;
} // end of loop
} // end of startGame() method
} //end of class -
Please help with cannot find symbol error. Been struggling all day :(
Hi all. :)
Writing a game for my phone with KToolbar and have been getting a cannot find symbol error for every variable and method I try to use across Classes. I've looked all over and though it seems a common problem I always either don't understand or can't get working the various solutions. Example of my errors:
C:\...\BTK800i.java:197: cannot find symbol
symbol : variable youSayWhat
location: class HelloCanvas
youSayWhat=key;
^
If I try BTK800i.variable or BTK800i.message I get a new error.
C:\...\src\BTK800i.java:184: non-static method newOrdersSarge() cannot be referenced from a static context
BTK800i.newOrdersSarge();
^
Both these errors apply to both variables and methods. It only happens when I'm using methods/variables of one class in another, am I using public and private incorrectly? It doesn't seem to make a difference if I make variables public or leave them private, I'm trying to get to them with a public method within a private class. Is it something else? I really have no idea. :(
Here's my code, it's long enough to be a tiresome read so I've tried to skip what I know isn't relevant.
public class BTK800i extends MIDlet {
private Display myDisplay;
private HelloCanvas myCanvas;
public int youSayWhat;
//a whole bunch more skipped here, but I'm fairly certain it's not anything that'll help find a solution
public BTK800i() {
paused=false;
public void startApp() throws MIDletStateChangeException {
if( paused ) {
myCanvas.repaint();
else {
myDisplay=Display.getDisplay(this);
myCanvas=new HelloCanvas();
myDisplay.setCurrent(myCanvas);
myCanvas.setFullScreenMode(true);
youSayWhat=0;
//again with the skipping, more code not related
public void newOrdersSarge() {
//whole bunch of code
//other methods skipped
class HelloCanvas extends Canvas {
public void keyPressed (int key) {
youSayWhat=key;
repaint ();
//skippage
}The stuff I skipped is mainly either more of the same sorta thing or maths/writing to screen stuff.
Thanks alot to anyone who helps. I'm really struggling with this. :(
Dan.But I have been reading them :(
My next-door neighbour unfortunately is an 80-something married man, but I will go have a looksie about static and instances.
I thought the point of public variables was that other classes could use them, is this wrong?
Also does this mean that to use the variables from my BTK class in the HelloCanvas class I need to first instantiate BTK? I don't understand how that works as the code starts running from the BTK class in the first place :S I guess more reading will help with this.
Thanks very much for replying. :)
Edit:
OK I have read up on it but I don't think I found anything I hadn't read before. I tried to make a new class which I could instantiate to hold all the variables and methods I wanted everything to be able to access, but that went disastrously. Am I right in understanding that there are no global variables in Java? :s
Edited by: Dan69 on Apr 17, 2010 1:15 PM -
cannot find symbolhi guys ... i getting this error... dunno what i did worng...
i have two classes :
package modaprend.Disciplines;
public class LearningObjects {
/** Creates a new instance of LearningObjects */
public LearningObjects(String newPath){
this.path = newPath;
and :
package modaprend.Disciplines;
public class Exercises extends LearningObjects{
/** Creates a new instance of Exercises */
public Exercises() { ----> i got the error here
ERROR :
init:
deps-jar:
Compiling 1 source file to /home/pluster/Ual/LPP1/ModAprend/build/classes
/home/pluster/Ual/LPP1/ModAprend/src/modaprend/Disciplines/Exercises.java:14: cannot find symbol
symbol : constructor LearningObjects()
location: class modaprend.Disciplines.LearningObjects
public Exercises() {
1 error
BUILD FAILED (total time: 1 second)
i running Linux (FC3) + JDK 5.0 + Netbeans 4.0 Beta 2 for editing
ThanksIt looks like LearningObjects has a single constructor that takes a String as an argument. That means the the ONLY way to create a LearningObjects object is with a String argument.
Next, Excercises extends LearningObjects. Extends means "is a." So to create an Excercises object, an Excercises constructor MUST call a LearningObject constructor. If the only LearningObjects constructor requires a Sring, then the Excercises constructor MUST provide a String.
You need to have a line like super("default"); as the first line in the Excercises constructor(s). -
Help with 'cannot find symbol' error
Ive written the following code. It is an excerpt from my entire class.
When I try to compile the code I get the error:-
cannot find symbol
Symbol: variable playerRun1
location: this class
public void analysePlayerMove()
if (playerGo == true)
if (playerMove.getComponentCount() == 0)
JOptionPane.showMessageDialog(this, "You Have Not Made A Move", "Empty Move", JOptionPane.ERROR_MESSAGE);
else
if (areTherePickUps == false)
for (int j=0; j<playerMove.getComponentCount(); j++)
//reversing the players hand, because what is displayed on the GUI is reversed
Component[] playerRun = playerMove.getComponentsInLayer(playerMove.DEFAULT_LAYER);
Component[] playerRun1 = new Component[playerRun.length];
int reverse = playerRun.length-1;
for (int k=0; k<playerRun.length; k++)
playerRun1[k] = playerRun[reverse];
reverse--;
if (acePlayed == true && playerRun1.length == 1)
if (playerRun1[0] != acePlayedSuit)
JOptionPane.showMessageDialog(this, "Your Move Is Not Valid", "Invalid Move", JOptionPane.ERROR_MESSAGE);
else
//remove the cards from the players move hand and add them to the bottom of the shredded deck
}I dont understand why I am getting this error, I clearly define the variable.Yes, but the variable is declared inside a block and so it's local to that block. You can't use it outside its scope, which is the block in which you declared it. Re-read the section of your book about variable scope.
Maybe you are looking for
-
How we can print directly a report without preview to a local printer in web
How we can print directly a report without preview to a local printer in web-environment, whith Oracle 9ias Report server release 6i patch 11. The user want to print ticket, built by Oracle Report, without previuw on PDF format, in a web three-tier e
-
Can't add music to iPod touch 1st gen.
songs in iTunes are greyed out so they won't add or sync. Did a restore and keeps getting errors. This is an old ipod touch but I had it working fine at first added a bunch of music and after deleting can't add music from my mac. please help
-
Wrong import warning on JSP page
I've installed NitroX (v/2.0.0 build 371) and started to use it on an existing project. On a JSP page I got a warning: "The import java.io is never used" from the directive: <%@ page buffer="1024kb" autoFlush="true" import="java.util.*, java.io.*"%>
-
How do i change my security questions when i do not know the anwser to it
help
-
How to (visually) crop a screen recording???
OK, QuickTime X is great at making a screen recording, and I now have a 1680x1050 .MOV. Great. What I want is to crop it, so that the video depicts for example 600x600 pixels in one are of the screen. How do I crop the resulting screen recording to a