Java Timer Example

area.java

import java.awt.Graphics;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JPanel;
import javax.swing.Timer;
/**
 *
 * @author kulekci
 */
public class area extends JPanel{

    private Timer animationTimer = null;
    private int max_x = 300;
    private int max_y = 400;
    private final int obj_w = 20;
    private final int obj_h = 20;
    private char operation_x = '+';
    private char operation_y = '+';
    private int current_x;
    private int current_y;
    private final int ANIMATION_DELAY = 10;

    public area(int m_x, int m_y){
        max_x = m_x;
        max_y = m_y;

    }

    @Override
    public void paintComponent( Graphics g ){
        super.paintComponent(g);
        this.setBackground(Color.red);
        
        g.setColor( Color.red );

        if (obj_w + current_x >= max_x){
            operation_x = '-';
        }

        if (current_x == 0){
            operation_x = '+';
        }

        if (obj_h + current_y >= max_y){
            operation_y = '-';
        }

        if (current_y == 0){
            operation_y = '+';
        }

        if (animationTimer == null){
            current_x = 0;current_y = 0;
        }else{

            current_x = ( (operation_x == '+')?( (1 + current_x) ):( (current_x - 1) ) );
            current_y = ( (operation_y == '+')?( (1 + current_y) ):( (current_y - 1) ) );

        }
        
        g.fillRect(
                current_x,
                current_y,
                obj_w,
                obj_h
                );

        g.setColor(Color.blue);
        g.drawString("X:"+current_x + " - Y:"+current_y, 100, 100);

    }

    public void startAnimation(){
        if (animationTimer == null){
            current_x = 0;
            current_y = 0;
            animationTimer = new Timer(ANIMATION_DELAY, new TimerHandler() );
            animationTimer.start();
        }else{
            if (!animationTimer.isRunning()){
                animationTimer.restart();
            }
        }
    }

    public void animationStop(){
        animationTimer.stop();
        animationTimer = null;
    }

    private class TimerHandler implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            repaint();
        }
    }
}

Main.java

import javax.swing.JFrame;


/**
 *
 * @author kulekci
 */
public class Main {

    /**
     * @param args the command line arguments
     */

    
    public static void main(String[] args) {
        // TODO code application logic here
        JFrame frame = new JFrame("Users Main Form");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        area area_1 = new area();
        frame.add(area_1);
        frame.setSize(300,400);
        frame.setVisible(true);

        area_1.startAnimation();
    }

}