GM GamePanel.java

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;

import javax.swing.JPanel;

public class GamePanel extends JPanel{

	//First Ball Horizontal Movement with Collision Detection
    int fx = 0;
    int fy = 30;
    int firstXBallSpeed = 1;
    void moveFBall() {
        fx = fx + firstXBallSpeed;
        if(fx > 80 || fx < 1){
        	firstXBallSpeed *= -1;
        }
    }

    //second ball Diagonal
    int sx = 100;
    int sy = 0;
    int secYBallSpeed = 1;
    int secXBallSpeed = 1;
    void moveSBall(){
        sy = sy + secYBallSpeed;
        sx = sx + secYBallSpeed;

        if(sy > 80 || sy < 0){
        	secYBallSpeed *= -1;
        }
    }

    //second third Diagonal
    int tx = 230;
    int ty = 0;
    int thYBallSpeed = 1;
    void movetBall(){
        ty = ty + thYBallSpeed;
        if(ty > 80 || ty < 1){
        	thYBallSpeed *= -1;
        }
    }

    double MAX_X = 30;
    double MAX_Y = 30;
    double angle = 0;
    int frballx = 0;
    int frbally = 0;

    void movefrBall(){

    	//making angle lower will reduce its speed
        angle += 0.1;

        frballx = (int) (Math.cos(angle) * MAX_X);
        frbally = (int) (Math.sin(angle) * MAX_Y);

        //move the ball to desired location
        frballx += 330;
        frbally += 40;


    }


    //rectangular movement

    int fyy = 0;
    int fxx = 400;
    int fyyspeed = 1;
    int fxxspeed = 1;

    void moveftBall(){
    	if(fyy == 0){
    		fxx += fxxspeed;
    	}else if (fyy == 80){
    		fyyspeed = 0;
    		fxxspeed = 1;
    		fxx -= fxxspeed;
    	}

    	if(fxx == 480){
    		fxxspeed  = 0;
    		fyy += fyyspeed;
    	}

    	if(fxx == 400){
    		fyyspeed  = 1;
    		fyy -= fyyspeed;
    	}



    }

    @Override
    public void paint(Graphics g) {
        super.paint(g);
        Graphics2D g2d = (Graphics2D) g;
        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
            RenderingHints.VALUE_ANTIALIAS_ON);


        for(int i = 0; i < 5 ; i++){
            g2d.drawRect(i * 100, 0, 100, 100);
        }

        g2d.drawString("Horizontal", 20, 120);
        g2d.drawString("Diagonal", 120, 120);
        g2d.drawString("Vertical", 220, 120);
        g2d.drawString("Circular", 320, 120);
        g2d.drawString("Rectangular", 410, 120);

        g2d.setColor(Color.RED);

        //Draw 1st ball;
        g2d.fillOval(fx, fy, 20, 20);


        //Draw 2nd ball;
        g2d.fillOval(sx, sy, 20, 20);

        //Draw 3rd ball;
        g2d.fillOval(tx, ty, 20, 20);

        //Draw 4th ball;
        g2d.fillOval(frballx, frbally, 20, 20);

        //Draw 5th Ball
        g2d.fillOval(fxx, fyy, 20, 20);



    }
}