import java.awt.*;
import java.awt.event.*;

public class main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		  Frame frm=new Frame("Ivan");
		  
		  frm.setSize(550,400);
		  frm.setVisible(true);
		  frm.addWindowListener(new WindowAdapter(){
		  public void windowClosing(WindowEvent e){
		  System.exit(0);
		  }
		  });
		  Panel p = new Panel();		  
		  p.setLayout(new GridLayout(3,1));
		  
		  final Button b1=new Button("Click me");
		  p.add(b1);		
		  final Button b2=new Button("");
		  p.add(b2);
		  final Button b3=new Button("");
		  p.add(b3);
		  ActionListener a = new ActionListener() {
              public void actionPerformed(ActionEvent ae) {
            	  String s = ae.getActionCommand(); 
            	  if (s.equals("Click me")) { 
            	  if(ae.getSource().equals(b1))
        		  {
            		  b2.setLabel("Click me");        		
        		  }
            	  if(ae.getSource().equals(b2))
        		  {
            		  b3.setLabel("Click me");        		
        		  }  
              }
              }
          };
		  b1.addActionListener(a);
		  b2.addActionListener(a);
		  b3.addActionListener(a);
		  frm.add(p,BorderLayout.NORTH);
		  }
	}

import javax.swing.*;
import java.awt.event.*;

public class Main {
    static JButton jButton1 = new JButton("0");
    static JButton jButton2 = new JButton("1");
    static JButton jButton3 = new JButton("2");
    static JButton jButton4 = new JButton("3");
    static JButton myButts[]={jButton1, jButton2, jButton3, jButton4};

    public static void main(String[] args)
    {
        ActionListener al = new ActionListener()
        {
            public void actionPerformed(ActionEvent ae)
            {
                int i;
                int newbutton;
                for(i = 0; i<myButts.length-1; i++)
                {
                    if(myButts[i].equals(ae.getSource()))
                        break;
                }
                if(i==myButts.length-1)
                    newbutton = 0;
                else
                    newbutton = i + 1;
                myButts[newbutton].setText(myButts[i].getText());
            }
        };

        JFrame jfrm = new JFrame("myButtons");
        jfrm.setSize(300,100);
        JPanel jp=new JPanel();
        jp.setLayout(new BoxLayout(jp, BoxLayout.LINE_AXIS));
        jfrm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        for(JButton butt: myButts)
        {
            butt.addActionListener(al);
            jp.add(butt);
        }
        jfrm.add(jp);
        jfrm.setVisible(true);
    }
}