SimpleAnimation.java

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import javax.swing.*;  
import java.awt.*;
 
public class SimpleAnimation {  
    int x = 70;
    int y = 70;
 
    public static void main(String[] args) {  
        SimpleAnimation gui = new SimpleAnimation(); 
        gui.go();
    }
 
    public void go() {
        JFrame frame = new JFrame();  
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        MyAnimPanel animPanel = new MyAnimPanel();
        frame.add(animPanel);  
        frame.setSize(300, 300);  
        frame.setVisible(true);
        for (int i = 0; i < 130; i++) {  
            x++;
            y++;
            animPanel.repaint();
            try {
                Thread.sleep(50);
            } catch (Exception ex) { }
        }
    } // close go() method
 
    class MyAnimPanel extends JPanel {
        public void paintComponent(Graphics g) { 
            g.clearRect(0, 0, this.getWidth(), this.getHeight());
            g.setColor(Color.GREEN); 
            g.fillOval(x, y, 40, 40);
        }
    } // close inner class
 
} // close outer class