Problem compiling program... Should be a simple fix!!!
Exception in thread "main" java.lang.NoClassDefFoundError: Paint
While trying to compile with the command 'java Paint fig.svg 300' (the following two are parameters) I get the error above.
Paint is a user defined class with an empty constuct.
The code compiles and works properly in Eclipse.
import java.io.FileWriter;
import java.util.Random;
import java.io.PrintWriter;
class Paint{
static String fileWrite = "";
private String setColor;
public Paint( )
private void open(int dimen, int dimen2)
fileWrite = "<svg xmlns=\"http://www.w3.org/2000/svg\"" +
"xmlns:xlink=\"http://www.w3.org/1999/xlink\"" +
"width=\"" + dimen + "%\"" +
"height=\"" + dimen2 + "%\"" +
"viewBox=\"0 0 150 150\"" +
"version=\"1.0\">" +
"<g>";
private static String random255()
Random generator = new Random();
int s = generator.nextInt(256);
String s1 = Integer.toHexString(s);
return s1;
private void setColor(String string)
this.setColor = string;
private void rect(int i, int j, int k, int l)
fileWrite = fileWrite + "<rect x=\"" + i + "\" y=\"" + j +
"\" height=\"" + k + "\" width=\"" + l + "\" fill=\"" +
setColor + "/>";
private void close()
fileWrite = fileWrite + "</g>" + "</svg>";
public static void main(String [] args)throws Exception{
FileWriter fileWriter = new FileWriter( args[0] );
PrintWriter out = new PrintWriter( fileWriter );
int dimen = Integer.parseInt( args[1] );
Paint paint = new Paint();
paint.open(dimen,dimen);
dimen = dimen / 2;
int originX = dimen, originY = dimen;
for(; dimen > 0; dimen = dimen - 3){
String red = random255();
String green = random255();
String blue = random255();
paint.setColor( "#" + red + green + blue );
paint.rect(originX-dimen,originY-dimen,dimen*2,dimen*2);
paint.close();
out.print(fileWrite);
out.close();
}{code}
I like that reaction Edward :-) But it is strange that someone can write that many lines of Java code without knowing that you need to compile first before trying to execute.
Similar Messages
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hello.
this is james mcfadden. i'm having problems compiling the Demo.java program. the Demo.java program is shown below along with the MediaPanel.java and MediaTest.java programs. when i compile the Demo.java program i get the following errors. i really need help in getting rid of these errors.
----jGRASP exec: javac -g X:\CP4B Project\Demo.java
Demo.java:297: cannot find symbol
symbol : class Media
location: class Demo
MediaTest media=new Media();
^
Demo.java:301: cannot find symbol
symbol : class Media
location: class Demo
MediaTest media=new Media();
^
Demo.java:305: cannot find symbol
symbol : class Media
location: class Demo
MediaTest media=new Media();
^
3 errors
----jGRASP wedge2: exit code for process is 1.
----jGRASP: operation complete.
//Written by:Seamus McFadden
//Class:CP4B
//Program Number:1
//Program Name:Demo.java
//Description:
//Supervisor:Gerard McCloskey
import java.awt.*;//Contains all of the classes for creating user interfaces and for painting graphics and images
import java.awt.event.*;//Provides interfaces and classes for dealing with different types of events fired by AWT components
import javax.swing.*;//Provides a set of lightweight components that, to the maximum degree possible, work the same on all platforms
public class Demo extends JFrame{
public static void main(String[] args){
int choice=-1;//a variable of type int that is set to -1
choice=getChoice();//invokes the method getChoice()
if(choice!=0){
getSelected(choice);//invokes the method getSelected(choice)
}//end if
}//end main
public static int getChoice(){
String choice;//a variable of type string
int ch;//a variable of type int
choice=JOptionPane.showInputDialog(null,
"1. Product Menu\n" +
"2. Member Menu\n" +
"3. Rental Menu\n" +
"4. Media Menu\n" +
"5. Log Off\n\n" +
"Enter your choice");//asks the user for some input
ch=Integer.parseInt(choice);//a class that wraps a value of the primitive type int in an object
return ch;//a method that returns an integer value
}//end getChoice
public static void getSelected(int choice){
if(choice == 1) {
product();
}//end if
if(choice==2){
member();
}//end if
if(choice==3){
rental();
}//end if
if(choice==4){
media();
}//end if
if(choice==5){
LogOff logoff=new LogOff();
}//end if
else{
ErrorMessage error=new ErrorMessage();
}//end getSelected
public static void product(){
int productChoice=-1;//a variable of type int that is set to -1
productChoice=getProductChoice();//invokes the method getChoice()
if(productChoice!=0){
getProductSelected(productChoice);//invokes the method getSelected(choice)
}//end if
getChoice();
public static void member(){
int memberChoice=-1;//a variable of type int that is set to -1
memberChoice=getMemberChoice();//invokes the method getChoice()
if(memberChoice!=0){
getMemberSelected(memberChoice);//invokes the method getSelected(choice)
}//end if
getChoice();
public static void rental(){
int rentalChoice=-1;//a variable of type int that is set to -1
rentalChoice=getRentalChoice();//invokes the method getChoice()
if(rentalChoice!=0){
getRentalSelected(rentalChoice);//invokes the method getSelected(choice)
}//end if
getChoice();
public static void media(){
int mediaChoice=-1;//a variable of type int that is set to -1
mediaChoice=getMediaChoice();//invokes the method getChoice()
if(mediaChoice!=0){
getMediaSelected(mediaChoice);//invokes the method getSelected(choice)
}//end if
getChoice();
public static int getProductChoice(){
String productChoice;//a variable of type string
int pch;//a variable of type int
productChoice=JOptionPane.showInputDialog(null,
"1. Add product details\n" +
"2. View product details\n" +
"3. Edit product details\n" +
"4. Delete product details\n" +
"5. Return to main menu\n\n" +
"Enter your choice");//asks the user for some input
pch=Integer.parseInt(productChoice);//a class that wraps a value of the primitive type int in an object
return pch;//a method that returns an integer value
}//end getProductChoice
public static int getMemberChoice(){
String memberChoice;//a variable of type string
int mch;//a variable of type int
memberChoice=JOptionPane.showInputDialog(null,
"1. Add member details\n" +
"2. View member details\n" +
"3. Edit member details\n" +
"4. Delete member details\n" +
"5. Return to main menu\n\n" +
"Enter your choice");//asks the user for some input
mch=Integer.parseInt(memberChoice);//a class that wraps a value of the primitive type int in an object
return mch;//a method that returns an integer value
}//end getMemberChoice
public static int getRentalChoice(){
String rentalChoice;//a variable of type string
int rch;//a variable of type int
rentalChoice=JOptionPane.showInputDialog(null,
"1. Add rental details\n" +
"2. View rental details\n" +
"3. Edit rental details\n" +
"4. Delete rental details\n" +
"5. Return to main menu\n\n" +
"Enter your choice");//asks the user for some input
rch=Integer.parseInt(rentalChoice);//a class that wraps a value of the primitive type int in an object
return rch;//a method that returns an integer value
}//end getRentalChoice
public static int getMediaChoice(){
String mediaChoice;//a variable of type string
int mtch;//a variable of type int
mediaChoice=JOptionPane.showInputDialog(null,
"1. Listen to songs\n" +
"2. View movie previews\n" +
"3. View game previews\n" +
"4. Return to main menu\n\n" +
"Enter your choice");//asks the user for some input
mtch=Integer.parseInt(mediaChoice);//a class that wraps a value of the primitive type int in an object
return mtch;//a method that returns an integer value
}//end getMediaChoice
public static void getProductSelected(int productChoice){
if(productChoice==1){
addProducts();
}//end if
if(productChoice==2){
viewProducts();
}//end if
if(productChoice==3){
editProducts();
}//end if
if(productChoice==4){
deleteProducts();
}//end if
else{
ErrorMessage error=new ErrorMessage();
}//end getProductSelected
public static void getMemberSelected(int memberChoice){
if(memberChoice==1){
addMembers();
}//end if
if(memberChoice==2){
viewMembers();
}//end if
if(memberChoice==3){
editMembers();
}//end if
if(memberChoice==4){
deleteMembers();
}//end if
else{
ErrorMessage error=new ErrorMessage();
}//end getMemberSelected
public static void getRentalSelected(int rentalChoice){
if(rentalChoice==1){
addRentals();
}//end if
if(rentalChoice==2){
viewRentals();
}//end if
if(rentalChoice==3){
editRentals();
}//end if
if(rentalChoice==4){
deleteRentals();
}//end if
else{
ErrorMessage error=new ErrorMessage();
}//end getRentalSelected
public static void getMediaSelected(int mediaChoice){
if(mediaChoice==1){
hearSongs();
}//end if
if(mediaChoice==2){
viewMovies();
}//end if
if(mediaChoice==3){
viewGames();
}//end if
else{
ErrorMessage error=new ErrorMessage();
}//end getMediaSelected
public static void addProducts(){
ProductForm product=new ProductForm();
product.getInput();
product.setVisible(true);
public static void viewProducts(){
DatabaseTest tt=new DatabaseTest();
tt.setVisible(true);
public static void editProducts(){
ProductForm product=new ProductForm();
product.getInput();
product.setVisible(true);
public static void deleteProducts(){
ProductForm product=new ProductForm();
product.setVisible(true);
public static void addMembers(){
MemberForm member=new MemberForm();
member.getInput();
member.setVisible(true);
public static void viewMembers(){
DatabaseTest tt=new DatabaseTest();
tt.setVisible(true);
public static void editMembers(){
MemberForm member=new MemberForm();
member.getInput();
member.setVisible(true);
public static void deleteMembers(){
MemberForm member=new MemberForm();
member.setVisible(true);
public static void addRentals(){
RentalForm rental=new RentalForm();
rental.getInput();
rental.setVisible(true);
public static void viewRentals(){
DatabaseTest tt=new DatabaseTest();
tt.setVisible(true);
public static void editRentals(){
RentalForm rental=new RentalForm();
rental.getInput();
rental.setVisible(true);
public static void deleteRentals(){
RentalForm rental=new RentalForm();
rental.setVisible(true);
public static void hearSongs(){
MediaTest media=new Media();
public static void viewMovies(){
MediaTest media=new Media();
public static void viewGames(){
MediaTest media=new Media();
}//end class Demo
import java.awt.BorderLayout;
import java.awt.Component;
import java.io.IOException;
import java.net.URL;
import javax.media.CannotRealizeException;
import javax.media.Manager;
import javax.media.NoPlayerException;
import javax.media.Player;
import javax.swing.JPanel;
public class MediaPanel extends JPanel{
public MediaPanel(URL mediaURL){
setLayout(new BorderLayout());//use a BorderLayout
//Use lightweight components for Swing compatibility
Manager.setHint(Manager.LIGHTWEIGHT_RENDERER,true);
try{
//create a player to play the media specified in the URL
Player mediaPlayer=Manager.createRealizedPlayer(mediaURL);
//get the components for the video and the playback controls
Component video=mediaPlayer.getVisualComponent();
Component controls=mediaPlayer.getControlPanelComponent();
if(video!=null)
add(video,BorderLayout.CENTER);//add video component
if(controls!=null)
add(controls,BorderLayout.SOUTH);//add controls
mediaPlayer.start();//start playing the media clip
}//end try
catch(NoPlayerException noPlayerException){
System.err.println("No media player found");
}//end catch
catch(CannotRealizeException cannotRealizeException){
System.err.println("Could not realize media player");
}//end catch
catch(IOException iOException){
System.err.println("Error reading from the source");
}//end catch
}//end MediaPanel constructor
}//end class MediaPanel
import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
public class MediaTest{
//launch the application
public static void main(String args[]){
//create a file chooser
JFileChooser fileChooser=new JFileChooser();
//show open file dialog
int result=fileChooser.showOpenDialog(null);
if(result==JFileChooser.APPROVE_OPTION){//user chose a file
URL mediaURL=null;
try{
//get the file as URL
mediaURL=fileChooser.getSelectedFile().toURL();
}//end try
catch(MalformedURLException malformedURLException){
System.err.println("Could not create URL for the file");
}//end catch
if(mediaURL!=null) {//only display if there is a valid URL
JFrame mediaTest=new JFrame("Media Tester");
mediaTest.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
MediaPanel mediaPanel=new MediaPanel(mediaURL);
mediaTest.add(mediaPanel);
mediaTest.setSize(300,300);
mediaTest.setVisible(true);
}//end inner if
}//end outer if
}//end main
}//end class MediaTesthello.
this is james mcfadden. thanks for the reply. i did what you told me to do, but i am still having trouble trying to use the 2 JMF programs (MediaPanel.java and MediaTest.java) with the Demo.java program. the Demo.java program compiles and runs ok, but when i press 1 (for listening to songs) in the media menu i get a JOptionPane (An Error Message) displayed on screen. how can i fix this problem?
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Demo extends JFrame{
public static void main(String[] args){
int choice=-1;//a variable of type int that is set to -1
choice=getChoice();//invokes the method getChoice()
if(choice!=0){
getSelected(choice);//invokes the method getSelected(choice)
}//end if
}//end main
public static int getChoice(){
String choice;//a variable of type string
int ch;//a variable of type int
choice=JOptionPane.showInputDialog(null,
"1. Product Menu\n" +
"2. Member Menu\n" +
"3. Rental Menu\n" +
"4. Media Menu\n" +
"5. Log Off\n\n" +
"Enter your choice");//asks the user for some input
ch=Integer.parseInt(choice);//a class that wraps a value of the primitive type int in an object
return ch;//a method that returns an integer value
}//end getChoice
public static void getSelected(int choice){
if(choice == 1) {
product();
}//end if
if(choice==2){
member();
}//end if
if(choice==3){
rental();
}//end if
if(choice==4){
media();
}//end if
if(choice==5){
LogOff logoff=new LogOff();
}//end if
else{
JOptionPane.showMessageDialog(null,"Error\n\nInvalid options\nPlease choose 1, 2, 3, 4 or 5 on the main menu\nPlease choose 1, 2, 3, 4 or 5 on the product menu\nPlease choose 1, 2, 3, 4 or 5 on the member menu\nPlease choose 1, 2, 3, 4 or 5 on the rental menu\nPlease choose 1, 2, 3 or 4 on the media menu");
System.exit(0);
}//end getSelected
public static void product(){
int productChoice=-1;//a variable of type int that is set to -1
productChoice=getProductChoice();//invokes the method getChoice()
if(productChoice!=0){
getProductSelected(productChoice);//invokes the method getSelected(choice)
}//end if
getChoice();
public static void member(){
int memberChoice=-1;//a variable of type int that is set to -1
memberChoice=getMemberChoice();//invokes the method getChoice()
if(memberChoice!=0){
getMemberSelected(memberChoice);//invokes the method getSelected(choice)
}//end if
getChoice();
public static void rental(){
int rentalChoice=-1;//a variable of type int that is set to -1
rentalChoice=getRentalChoice();//invokes the method getChoice()
if(rentalChoice!=0){
getRentalSelected(rentalChoice);//invokes the method getSelected(choice)
}//end if
getChoice();
public static void media(){
int mediaChoice=-1;//a variable of type int that is set to -1
mediaChoice=getMediaChoice();//invokes the method getChoice()
if(mediaChoice!=0){
getMediaSelected(mediaChoice);//invokes the method getSelected(choice)
}//end if
getChoice();
public static int getProductChoice(){
String productChoice;//a variable of type string
int pch;//a variable of type int
productChoice=JOptionPane.showInputDialog(null,
"1. Add product details\n" +
"2. View product details\n" +
"3. Edit product details\n" +
"4. Delete product details\n" +
"5. Return to main menu\n\n" +
"Enter your choice");//asks the user for some input
pch=Integer.parseInt(productChoice);//a class that wraps a value of the primitive type int in an object
return pch;//a method that returns an integer value
}//end getProductChoice
public static int getMemberChoice(){
String memberChoice;//a variable of type string
int mch;//a variable of type int
memberChoice=JOptionPane.showInputDialog(null,
"1. Add member details\n" +
"2. View member details\n" +
"3. Edit member details\n" +
"4. Delete member details\n" +
"5. Return to main menu\n\n" +
"Enter your choice");//asks the user for some input
mch=Integer.parseInt(memberChoice);//a class that wraps a value of the primitive type int in an object
return mch;//a method that returns an integer value
}//end getMemberChoice
public static int getRentalChoice(){
String rentalChoice;//a variable of type string
int rch;//a variable of type int
rentalChoice=JOptionPane.showInputDialog(null,
"1. Add rental details\n" +
"2. View rental details\n" +
"3. Edit rental details\n" +
"4. Delete rental details\n" +
"5. Return to main menu\n\n" +
"Enter your choice");//asks the user for some input
rch=Integer.parseInt(rentalChoice);//a class that wraps a value of the primitive type int in an object
return rch;//a method that returns an integer value
}//end getRentalChoice
public static int getMediaChoice(){
String mediaChoice;//a variable of type string
int mtch;//a variable of type int
mediaChoice=JOptionPane.showInputDialog(null,
"1. Listen to songs\n" +
"2. View movie previews\n" +
"3. View game previews\n" +
"4. Return to main menu\n\n" +
"Enter your choice");//asks the user for some input
mtch=Integer.parseInt(mediaChoice);//a class that wraps a value of the primitive type int in an object
return mtch;//a method that returns an integer value
}//end getMediaChoice
public static void getProductSelected(int productChoice){
if(productChoice==1){
addProducts();
}//end if
if(productChoice==2){
viewProducts();
}//end if
if(productChoice==3){
editProducts();
}//end if
if(productChoice==4){
deleteProducts();
}//end if
else{
JOptionPane.showMessageDialog(null,"Error\n\nInvalid options\nPlease choose 1, 2, 3, 4 or 5 on the main menu\nPlease choose 1, 2, 3, 4 or 5 on the product menu\nPlease choose 1, 2, 3, 4 or 5 on the member menu\nPlease choose 1, 2, 3, 4 or 5 on the rental menu\nPlease choose 1, 2, 3 or 4 on the media menu");
System.exit(0);
}//end getProductSelected
public static void getMemberSelected(int memberChoice){
if(memberChoice==1){
addMembers();
}//end if
if(memberChoice==2){
viewMembers();
}//end if
if(memberChoice==3){
editMembers();
}//end if
if(memberChoice==4){
deleteMembers();
}//end if
else{
JOptionPane.showMessageDialog(null,"Error\n\nInvalid options\nPlease choose 1, 2, 3, 4 or 5 on the main menu\nPlease choose 1, 2, 3, 4 or 5 on the product menu\nPlease choose 1, 2, 3, 4 or 5 on the member menu\nPlease choose 1, 2, 3, 4 or 5 on the rental menu\nPlease choose 1, 2, 3 or 4 on the media menu");
System.exit(0);
}//end getMemberSelected
public static void getRentalSelected(int rentalChoice){
if(rentalChoice==1){
addRentals();
}//end if
if(rentalChoice==2){
viewRentals();
}//end if
if(rentalChoice==3){
editRentals();
}//end if
if(rentalChoice==4){
deleteRentals();
}//end if
else{
JOptionPane.showMessageDialog(null,"Error\n\nInvalid options\nPlease choose 1, 2, 3, 4 or 5 on the main menu\nPlease choose 1, 2, 3, 4 or 5 on the product menu\nPlease choose 1, 2, 3, 4 or 5 on the member menu\nPlease choose 1, 2, 3, 4 or 5 on the rental menu\nPlease choose 1, 2, 3 or 4 on the media menu");
System.exit(0);
}//end getRentalSelected
public static void getMediaSelected(int mediaChoice){
if(mediaChoice==1){
hearSongs();
}//end if
if(mediaChoice==2){
viewMovies();
}//end if
if(mediaChoice==3){
viewGames();
}//end if
else{
JOptionPane.showMessageDialog(null,"Error\n\nInvalid options\nPlease choose 1, 2, 3, 4 or 5 on the main menu\nPlease choose 1, 2, 3, 4 or 5 on the product menu\nPlease choose 1, 2, 3, 4 or 5 on the member menu\nPlease choose 1, 2, 3, 4 or 5 on the rental menu\nPlease choose 1, 2, 3 or 4 on the media menu");
System.exit(0);
}//end getMediaSelected
public static void addProducts(){
ProductForm product=new ProductForm();
product.getInput();
product.setVisible(true);
public static void viewProducts(){
DatabaseTest tt=new DatabaseTest();
tt.setVisible(true);
public static void editProducts(){
ProductForm product=new ProductForm();
product.getInput();
product.setVisible(true);
public static void deleteProducts(){
ProductForm product=new ProductForm();
product.setVisible(true);
public static void addMembers(){
MemberForm member=new MemberForm();
member.getInput();
member.setVisible(true);
public static void viewMembers(){
DatabaseTest tt=new DatabaseTest();
tt.setVisible(true);
public static void editMembers(){
MemberForm member=new MemberForm();
member.getInput();
member.setVisible(true);
public static void deleteMembers(){
MemberForm member=new MemberForm();
member.setVisible(true);
public static void addRentals(){
RentalForm rental=new RentalForm();
rental.getInput();
rental.setVisible(true);
public static void viewRentals(){
DatabaseTest tt=new DatabaseTest();
tt.setVisible(true);
public static void editRentals(){
RentalForm rental=new RentalForm();
rental.getInput();
rental.setVisible(true);
public static void deleteRentals(){
RentalForm rental=new RentalForm();
rental.setVisible(true);
public static void hearSongs(){
MediaTest media=new MediaTest();
public static void viewMovies(){
MediaTest media=new MediaTest();
public static void viewGames(){
MediaTest media=new MediaTest();
}//end class Demo
import java.awt.BorderLayout;
import java.awt.Component;
import java.io.IOException;
import java.net.URL;
import javax.media.CannotRealizeException;
import javax.media.Manager;
import javax.media.NoPlayerException;
import javax.media.Player;
import javax.swing.JPanel;
public class MediaPanel extends JPanel{
public MediaPanel(URL mediaURL){
setLayout(new BorderLayout());//use a BorderLayout
//Use lightweight components for Swing compatibility
Manager.setHint(Manager.LIGHTWEIGHT_RENDERER,true);
try{
//create a player to play the media specified in the URL
Player mediaPlayer=Manager.createRealizedPlayer(mediaURL);
//get the components for the video and the playback controls
Component video=mediaPlayer.getVisualComponent();
Component controls=mediaPlayer.getControlPanelComponent();
if(video!=null)
add(video,BorderLayout.CENTER);//add video component
if(controls!=null)
add(controls,BorderLayout.SOUTH);//add controls
mediaPlayer.start();//start playing the media clip
}//end try
catch(NoPlayerException noPlayerException){
System.err.println("No media player found");
}//end catch
catch(CannotRealizeException cannotRealizeException){
System.err.println("Could not realize media player");
}//end catch
catch(IOException iOException){
System.err.println("Error reading from the source");
}//end catch
}//end MediaPanel constructor
}//end class MediaPanel
import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
public class MediaTest{
//launch the application
public static void main(String args[]){
//create a file chooser
JFileChooser fileChooser=new JFileChooser();
//show open file dialog
int result=fileChooser.showOpenDialog(null);
if(result==JFileChooser.APPROVE_OPTION){//user chose a file
URL mediaURL=null;
try{
//get the file as URL
mediaURL=fileChooser.getSelectedFile().toURL();
}//end try
catch(MalformedURLException malformedURLException){
System.err.println("Could not create URL for the file");
}//end catch
if(mediaURL!=null) {//only display if there is a valid URL
JFrame mediaTest=new JFrame("Media Tester");
mediaTest.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
MediaPanel mediaPanel=new MediaPanel(mediaURL);
mediaTest.add(mediaPanel);
mediaTest.setSize(300,300);
mediaTest.setVisible(true);
}//end inner if
}//end outer if
}//end main
}//end class MediaTest -
New to java - glitch in my program/game? should be a simple fix :)
hey everyone, I'm a student who's new to java programming :) It's is also the first programming language that I'm learning. I know the basics, but nothing very complicated.
I'm making a pong-like game, in an applet.
As I was making the paddle and using a mouselistener to make it move vertically, I came across this problem, the paddle will move vertically with the mouse's position, but one end of my paddle will grow abnormally (I want it to stay the same size as it moves up and down)
Here's my code: (I'm not using most of the mouselistener and keylistener classes yet, so you can ignore them. I'm guessing the problem is probably in one of the last classes, at the bottom)
ypaddle is the variable used for getting the co-ordinates of the mouse and transferring them to the paddle itself
// The "Ping" class.
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
*Ping
public class Ping extends Applet
implements KeyListener, MouseListener, MouseMotionListener
int width, height, x, ypaddle;
Graphics g;
char move;
*Initializes variables
public void init ()
resize (700, 500);
setBackground (Color.white);
addKeyListener (this);
addMouseListener (this);
addMouseMotionListener(this);
public void keyPressed (KeyEvent e)
public void keyReleased (KeyEvent e)
public void keyTyped (KeyEvent e)
public void mouseEntered (MouseEvent e)
public void mouseExited (MouseEvent e)
public void mousePressed (MouseEvent e)
public void mouseReleased (MouseEvent e)
public void mouseClicked (MouseEvent e)
public void mouseMoved (MouseEvent e)
ypaddle = e.getY ();
repaint();
public void mouseDragged (MouseEvent e)
public void paint (Graphics g)
paddle (g, ypaddle);
* Creates the paddle for hitting the ball
*@param y value used to move the paddle vertically
public void paddle (Graphics g, int y)
g.fillRect (10, 10+y, 15, 60+y);
} // Ping classI'm totally stumped, I've tried for 2 hours to find the problem, and I have a feeling it's something very simple that I'm passing over...
If you have any questions about the variables or other things, please ask!
And one last little quick question, is there a way I can restrict the movement of the paddle between two Y values? (i.e not higher than y=10 or lower than y=100)
Thanks in advance :)soundweave wrote:
I'm not exactly sure how to find out, Eh?
You wrote this code:
g.fillRect (10, 10+y, 15, 60+y);Do you understand what fillRect does? If I call fillRect(10, 20, 30, 40) where will that rectangle be drawn? If you don't know how to answer that, I don't see how you could have written that line of code.
but here's some pictures of what happens ( I put in 0 and 80 as the y values in each picture, and left the code window open so you can see )I don't need to see them.
Y at 0: [http://i731.photobucket.com/albums/ww314/len56/Untitled.jpg?t=1263077701|http://i731.photobucket.com/albums/ww314/len56/Untitled.jpg?t=1263077701]
Y at 80: [http://i731.photobucket.com/albums/ww314/len56/Untitled2.jpg?t=1263077625|http://i731.photobucket.com/albums/ww314/len56/Untitled2.jpg?t=1263077625]
So, given that the first one comes from fillRect(10, 10, 15, 60), (you get where that comes from I hope) and the second comes from fillRect(10, 90, 15, 150) (that too), does that not suggest that something is wrong with the numbers you're passing to fillRect? And since you have read the docs for fillRect and know what it does and what each of its parameters represents (right?), does it not suggest exactly what is wrong with those numbers? -
Very strange serialization problem(in what should be a simple solution)
I'm trying to serialize a hashTable. And i'm trying to do it the same way that I serialized my binaryTree(which had no problems)
But, for some reason it isn't working. I'm getting a SER file of only 3kb, and when I try to read the file after writing it my hashTable is coming out null.
Here is a few code snippets:
public class DictionaryController implements Serializable
private static final long serialVersionUID = 1L;
private HashTable hash;
private Input inputer;
private RandomAccessFile raf;
public DictionaryController()
if(checkDictionary() == true)
try
FileInputStream inFile = new FileInputStream("res/dictionaryHash.ser");
ObjectInputStream inStream = new ObjectInputStream(inFile);
hash = (HashTable) inStream.readObject();
inStream.close();
catch(IOException ioe)
catch(ClassNotFoundException cnfe)
else
hash = new HashTable(50000, 0.8);
createRandomDictionary();
}This is where I try to open it. when I say hash = new HashTable, hash is coming as null when I debug it.
public void save()
try
FileOutputStream outFile = new FileOutputStream("res/dictionaryHash.ser");
ObjectOutputStream outStream = new ObjectOutputStream(outFile);
outStream.writeObject(hash);
outStream.close();
catch(IOException ioe)
}That is the save. It only writes the file to the hard drive when I close the GUI.
I've got all of my other classes implementing serializable, so I really can't figure out what is wrong.
Anyone have any ideas? I have long values being stored in my hashTable, but all primitives are already Serializable right??
argg. this seems like it should be such a simple problem but it just won't work. And its almost exactly the same as what I did before...Yeah, my fault for leaving the catch statements empty.
Anyway, it is the output stream IO that is throwing the exception
What do you mean by: You're probably hiding an instance variable with a member variable, but it's impossible to tell from the little bit of code you've shown.
I can print out more code just need to know what stuff to post.
Here is what i get from the printstacktrace:
java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: hashTable.HashTable$TableEntry
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1278)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1845)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1845)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1603)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1271)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1845)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
at dictionary.DictionaryController.<init>(DictionaryController.java:50)
at dictionary.MainClass.main(MainClass.java:11)
Caused by: java.io.NotSerializableException: hashTable.HashTable$TableEntry
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1054)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1332)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1304)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1332)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1304)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1224)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1050)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1332)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1304)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
at dictionary.DictionaryController.save(DictionaryController.java:157)
at dictionary.DictionaryGUI$ButtonHandler.actionPerformed(DictionaryGUI.java:91)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1786)
at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1839)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:245)
at java.awt.Component.processMouseEvent(Component.java:5100)
at java.awt.Component.processEvent(Component.java:4897)
at java.awt.Container.processEvent(Container.java:1569)
at java.awt.Component.dispatchEventImpl(Component.java:3615)
at java.awt.Container.dispatchEventImpl(Container.java:1627)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3483)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3198)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3128)
at java.awt.Container.dispatchEventImpl(Container.java:1613)
at java.awt.Window.dispatchEventImpl(Window.java:1606)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:100) -
Hey guys I'm new to programming so please be tolerant to my questions for a little.
Anyway..... I was writing a basic hello world program and it compiled fine. However, I can not run it.
It comes up with this error:
Exception in thread "main" java.lang.NoClassDefFoundError: HelloApp
Caused by: java.lang.ClassNotFoundException: HelloApp
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
The program I wrote was:
public class HelloApp
public static void main(String[] args)
helloMessage = "Hello, World!";
System.out.println(helloMessage);
static String helloMessage;
}You would use code tags for your code to retain its formatting and be readable. To do this, you will need to paste already formatted code into the forum, highlight this code, and then press the "code" button at the top of the forum Message editor prior to posting the message. You may want to click on the Preview tab to make sure that your code is formatted correctly. Another way is to place the tag [code] at the top of your block of code and the tag [/code] at the bottom, like so:
[code]
// your code block goes here.
// note the differences between the tag at the top vs the bottom.
[/code] -
InputStreamReader problem...should be an easy fix
try
FileReader reader = new FileReader(fileName);
InputStreamReader inputreader = new InputStreamReader(reader, Charset.forName("ISO-8859-1"));
BufferedReader buffer = new BufferedReader(inputreader);
My compiler says:
C:\java\NFOview>javac NFOview.java
NFOview.java:89: cannot resolve symbol
symbol : constructor InputStreamReader(java.io.InputStreamReader,java.nio.charset.Charset)
location: class java.io.InputStreamReader
InputStreamReader inputreader = new InputStreamReader(inputreader, Charset.forName("ISO-8859-1"));
^
1 errorHi Chris,
it sounds to me like you are trying to somehow get the upper-ascii characters in DOS to render (upper-ascii is what I call them). Stuff like the characters for creating borders, the different symbols common to fonts like Terminal, MS Linedraw, GWTE_437.. aka the Cp437 charset.
I'll trade answers with you... did you get the Terminal font itself to render in java (w/o the special chars).
I wrote a custom sort of drawString that used character glyphs and a custom mapping to be able to get the special symbols from MS Linedraw so my IRC Client would be able to render the special characters correctly.
I got the code at home... but answer my question and if your interested in my code to draw the upper-ascii characters let me know I'll post it in a day or so. -
Problem with a compiled program
Hello,
I have a problem with a compiled program on labview 6i.
This program used a serial port (COM1 or COM2).
During the launching of the ".exe ", a fatal error occurs.
Here this error:
=> APPLICATION caused an invalid page fault in
=> module LVRT.DLL at 0167:30164426.
Can somebody help me?
Regards
CedricCedric,
This problem was fixed in the LabVIEW 6.0.2 update. You can download this update (along with the updated runtime engine) from our website.
Good luck with your application, and have a pleasant day.
Sincerely,
Darren N.
NI Applications Engineer
Darren Nattinger, CLA
LabVIEW Artisan and Nugget Penman -
when i pluged in my ipod,computer start scanning,without finishing scan,it says"your computer is no more authorized for app that are installed in"yadav ipod",would you like to authorizes this computer for item purchased from itune" what should i do to fix this problem,,,
What the message says. In iTunes g the the Store tab in ther upper part of the screen and then clink on Authorize this computer.
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First, you must use a specific [[Managing profiles|profile]] for Firefox 4.0 Beta and keep your current one for Firefox 3.6 to prevent interferences between the two versions.
For your problem:
# [[Troubleshooting extensions and themes]] could be a cause.
# If not 1. and if it does not happen in [[Safe Mode]], you must disable HW acceleration in Options > Advanced > General. If it solves your issue, your graphic driver is out-of-date and must be updated. Go to your computer manufacturer support site. -
I can not get my Adobe Photoshop Elements 8 organize to open. The edit option comes up with no problem, but will crash when I try to access organize. What should I do to fix this problem?
Hi,
Which operating system are you running on?
Try starting the organizer while holding down the shift key. Hopefully, it should load the Catalog Manager.
Select your current catalog and click on the Repair button. Once it has finished, click on the Open button to see if the catalog opens.
Good luck,
Brian -
I can not do the update , what should I do to fix this error ?
"There was a problem with downloading the file . For tips on troubleshooting , please go to Customer Support . ( Error code : 204 ) ." thanksHi,
Please refer to the help document below:
Error downloading, installing, or updating Creative Cloud applications
Regards,
Sheena -
My garageband can't be used because when I open a project (new or old) the program extends beyond the bottom of the display screen and I can't access what is below the bottom of the screen (like the record button). I know there's a simple fix, but what?
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I have the simple plan premierecc and photoshop i want plus aftereffects what program should i have?
i have the simple plan premierecc and photoshop i want plus aftereffects what program should i have?
Cloud Plans https://creative.adobe.com/plans
-and subscription terms http://www.adobe.com/misc/subscription_terms.html -
My photos are in Raw Format when I open in Bridge and they appear very clean but when I transfer them to Photoshop they are full of noise. What should I do to fix the problem? Thanks.
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Just installed Firefox 4 but when I try to search for add-ons every result fails to find anything or the loading gui just keeps spinning. What should I try to fix this problem?
Glad you seem to have sorted things out.
The warning about the warranty is light hearted, I think at one stage it warned "here be dragons" but also intended to make us think as it warns that making changes may produce problems.
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