JAVA PROGRAM TO MOVE-A-BALL IN RESPONSE TO UP/DOWN/LEFT/RIGHT BUTTONS, AS WELL AS THE 4 ARROW KEYS.

PROGRAM :

package com.company;

import java.awt.Button;

import java.awt.Color;

import java.awt.event.*;

import java.awt.Graphics;

import java.applet.Applet;

public class MyApplet extends Applet implements ActionListener, KeyListener

{

    Button up_button,down_button, left_button, right_button;

    int x, y;

    String direction="Still";

    public void init()

    {

        x=0; y=0;

        setLayout(null);

        up_button = new Button("UP");

        down_button = new Button("DOWN");

        left_button = new Button("LEFT");

        right_button = new Button("RIGHT");

 

        add(up_button);

        up_button.setBounds(160, 200, 66, 30);

        up_button.addActionListener(this);

 

        add(down_button);

        down_button.setBounds(160, 270, 66, 30);

        down_button.addActionListener(this);

 

        add(left_button);

        left_button.setBounds(125, 235, 66, 30);

        left_button.addActionListener(this);

 

        add(right_button);

        right_button.setBounds(200, 235, 66, 30);

        right_button.addActionListener(this);

 

        addKeyListener(this);

        setFocusable(true);

        setBackground(Color.blue);

    }

    public void paint(Graphics g)

    {

        g.setColor(Color.red);

        g.fillOval(x , y, 45, 45);

 

    }

    public void actionPerformed(ActionEvent ef)

    {

        if (ef.getSource()==up_button)

        {

            if(y<=0)

            {

                y=850;

                repaint();

            }

            else

            {

                y-=5;

                repaint();

            }

        }

        else if (ef.getSource()==down_button)

        {

            if((y)>=850)

            {

                y=0;

                repaint();

            }

            else

            {

                y+=5;

                repaint();

            }

        }

        else if (ef.getSource()==left_button)

        {

            if(x<=0)

            {

                x=850;

                repaint();

            }

            else

            {

                x-=5;

                repaint();

            }

        }

        else if (ef.getSource()==right_button)

        {

            if((x)>=850)

            {

                x=0;

                repaint();

            }

            else

            {

                x+=5;

                repaint();

            }

        }

    }

 

    @Override

    public void keyPressed(KeyEvent e) {

        // TODO Auto-generated method stub

 

    }

    @Override

    public void keyReleased(KeyEvent e) {

        int key= e.getKeyCode();

        if(key==KeyEvent.VK_UP)

        {

            if(y<=0)

            {

                y=850;

                repaint();

            }

            else

            {

                y-=5;

                repaint();

            }

        }

        else if(key==KeyEvent.VK_DOWN)

        {

            if(y>=850)

            {

                y=0;

                repaint();

            }

            else

            {

                y+=5;

                repaint();

            }

        }

        else if(key==KeyEvent.VK_LEFT)

        {

            if(x<=0)

            {

                x=850;

                repaint();

            }

            else

            {

                x-=5;

                repaint();

            }

        }

        else if(key==KeyEvent.VK_RIGHT)

        {

            if(x>=850)

            {

                x=0;

                repaint();

            }

            else

            {

                x+=5;

                repaint();

            }

        }

    }

    @Override

    public void keyTyped(KeyEvent e) {

    }

}

/*

<applet code="MyApplet.class" height=500 width=500 >

</applet>

 */

 

OUTPUT :