Move an object

Hello, I need to move an object with the arrow key.
This is my object class:

Code :

---

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Paint;
import java.awt.Rectangle;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
 
 
public class matka {
	private int x;
	private int y;
 
	public matka (int x, int y)
	{
		this.x=x;
		this.y=y;
	}
 
	public void Paint (Graphics g)
	{
		//Rectangle r=new Rectangle();
		g.fillRect(x, y, 200, 20);
 
	}
	[COLOR="#FF0000"]public void moveL(int dx){
		this.x+=dx;
 
	}
	public void moveR(int dx){
		this.x-=dx;
 
	}[/COLOR]
 
}

---

And here my main page:

Code :

---

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.Timer;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;;
 
public class BallWorld1 extends Frame {
 
	private Ball aBall;
	private matka aMatka;
 
	public static void main (String [ ] args)	{
		BallWorld1 world = new BallWorld1 (Color.red);
		world.show ();
	}
 
 
	private BallWorld1 (Color ballColor) {
 
		// constructor for new ball world
			// resize our frame
		setSize (getHeight(),getWidth());
		setTitle ("Ball World");
		addMouseListener(new BallListener());
		aMatka = new matka(740,980);
			// initialize object data field
		aBall = new Ball (10, 15, 5);
		aBall.setColor (ballColor);
		aBall.setMotion (3.0, 6.0);
 
		addWindowListener( 
			new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
	}
 
 
 
	public void paint (Graphics g) {
			aMatka.Paint(g);
			aBall.paint (g);
			aBall.move();
			if ((aBall.x() < 0) || (aBall.x() > getSize().width))
				aBall.setMotion (-aBall.xMotion(), aBall.yMotion());
			if ((aBall.y() < 0) || (aBall.y() > getSize().height))
				aBall.setMotion (aBall.xMotion(), -aBall.yMotion());
	try { Thread.sleep(100); }
			catch (InterruptedException e) {}
			repaint();
	}
 
	class BallListener extends MouseAdapter {
		public void mousePressed(MouseEvent e) {
			aBall.moveTo(e.getX(), e.getY());
		}
	}
 
	[COLOR="#FF0000"]class MatkaListener implements KeyListener {
 
		 public void keyPressed(KeyEvent e)
		 {
			 switch (e.getKeyCode())
			 {
			 case KeyEvent.VK_RIGHT: aMatka.moveR(20);
				 break;
			 case KeyEvent.VK_LEFT: aMatka.moveL(20);
				 break;
			 }
		 }
		@Override
		public void keyReleased(KeyEvent arg0) {
			// TODO Auto-generated method stub
 
		}
		@Override
		public void keyTyped(KeyEvent arg0) {
			// TODO Auto-generated method stub
 
		}
 
	}[/COLOR]
 
}

---

Can you help me to see my problem and fix that ?

Try debugging the code by adding some println statements that print out the values of x and y that control the object's location. Print out all changes made to the x and y values and all uses of the x and y values.
The print out should help you see where the problem is and why the object is not moving.
Add a println() to the key listener to be sure it is being called.



The posted code does not compile: missing class: Ball

You should add 'implements Runnable
and here is some tips:

this is easy so i let you figure out this :)

x = 1; //horizontal moving speed
y = 1; //vertical moving speed
dx = x; //horizontaly variable x
dy = y; //verticaly variable y

case PAN_UP:
setDY(+1);
break;

case PAN_DOWN:
setDY(-1);
break;

case PAN_LEFT:
setDX(+1);
break;

case PAN_RIGHT:
setDX(-1);
break;

private void setDX(int dir){
dx = dir;

private void setDY(int dir){
dy = dir;

if(e.getKeyCode() == KeyEvent.VK_DOWN){
***.***(***.PAN_DOWN);

I hope this helps little bit :)

thank you both fo you, SOLVED.

Please mark thread as solved