Untitled

package p2;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class m4t1 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		JFrame frame = new JFrame();
		frame.setSize(300, 200);
		JLabel lab = new JLabel("0");
		JButton b = new JButton("1");
		frame.add(lab, BorderLayout.CENTER);
		frame.add(b, BorderLayout.SOUTH);
		
		
		b.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				int tmp = Integer.parseInt(b.getLabel());
				int tmp1 = Integer.parseInt(lab.getText());
				b.setLabel(""+tmp1);
				lab.setText(""+tmp);
			}
		});

		frame.setVisible(true);
	}

}