Scale_Template

// GUI JAVA

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;


public class Scale extends JPanel implements ActionListener, KeyListener {

    int ball_x = 100; // X axis inisialization
    int ball_y = 20;  // y asix inisialization

    int x2 = 1;  //First move trhough X axis
    int y2 = 1;  //First move trhough Y axis

    Timer t = new Timer(5, this);
    int x = 0, y = 0, velx = 0, vely = 0;



    public void ballMove(){

        if (ball_x > (300 - 48)) {  // 48 is size limit through X
            x2 = -1;
        }
        if (ball_x < 0) {
            x2 = 1;
        }
        if (ball_y > (300 - 65)) {  // 65 is size limit through Y
            y2 = -1;
        }
        if (ball_y < 0) {
            y2 = 1;
        }


        ball_x = ball_x + x2; // setting its position to initial X axis
        ball_y = ball_y + y2; // setting its position to initial Y axis
    }



    public Scale() {

        t.start();
        addKeyListener(this);
        setFocusable(true);
        setFocusTraversalKeysEnabled(false);
    }



    public void paintComponent(Graphics s ) {
        super.paintComponent(s);
        s.setColor(Color.BLUE);                   // Set rectangle colour
        s.fillRect(x, y, 15, 15);   // Set rectangle bar size
        //Graphics2D g2d = (Graphics2D) s;
        //g2d.fillOval(ball_x, ball_y, 30, 30);
        //s.setColor(Color.BLACK);

    }
    public void paint(Graphics g) {
        super.paint(g);
        g.setColor(Color.orange);
        Graphics2D g2d = (Graphics2D) g;
        g2d.fillOval(ball_x, ball_y, 30, 30);

    }

    public void actionPerformed(ActionEvent e) {
        if (x < 0) {
            velx = 0;
            x = 0;
        }

        if (x > 270) {
            velx = 0;
            x = 270;
        }

        if (y < 0) {
            vely = 0;
            y = 0;
        }

        if (y > 250) {
            vely = 0;
            y = 250;
        }


        x += velx;
        y += vely;
        repaint();
    }

    public void keyPressed(KeyEvent e) {
        int code = e.getKeyCode();

        if (code == KeyEvent.VK_DOWN) {
            vely = 1;
            velx = 0;
        }
        if (code == KeyEvent.VK_UP) {
            vely = -1;
            velx = 0;
        }
        if (code == KeyEvent.VK_LEFT) {
            vely = 0;
            velx = -1;
        }
        if (code == KeyEvent.VK_RIGHT) {
            vely = 0;
            velx = 1;

        }
    }

    public void keyTyped(KeyEvent e) {
    }

    public void keyReleased(KeyEvent e) {
        velx = 0;
        vely = 0;
    }



    public static void main(String arge[]) throws InterruptedException{



        JFrame f = new JFrame("Scale");
        Scale s = new Scale();
        f.add(s);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setSize(300, 300);  // Set Main Frame Size.
        f.setVisible(true);


        while (true) {

            s.ballMove();
            s.repaint();
            Thread.sleep(10);
        }
    }
}