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import javax.swing.*;
import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.event.*;
public class ThreadDemo extends JFrame {
/**
*
*/
private static final long serialVersionUID = 1L;
public ThreadDemo() {
JButton btn = new JButton("Click me");
btn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Thread thread1 = new Thread(new Runnable() {
public void run() {
Graphics g = getGraphics();
for (int i = 10; i < 300; i += 10) {
try {
Thread.sleep(100);
g.drawOval(i, 100, 10, 10);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
});

Thread thread2 = new Thread(new Runnable() {
public void run() {
Graphics g = getGraphics();
for (int i = 10; i < 300; i += 10) {
try {
Thread.sleep(500);
g.drawOval(i, 150, 15, 15);
g.draw3DRect(i, i, i, i, true);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
});





thread1.start();
thread2.start();


}
});
getContentPane().add(btn, BorderLayout.NORTH);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setSize(320, 200);
setVisible(true);
}
public static void main(String[] args) {
new ThreadDemo();
}
}