changetitle.java

一个十分好的java基础学习的课件

import java.awt.event.*;
import java.applet.Applet;
import java.awt.*;

public class ChangeTitle extends Applet implements ActionListener 
{
    Button b1, b2;
    Label label;

    public void init( ) 
    {
        b1 = new Button("Rosencrantz");
        b2 = new Button("Guildenstern");
        label=new Label("   Title Bar   ");
        b1.addActionListener(this);
        b2.addActionListener(this);
        add(b1);
        add(b2);
        add(label);
    }

    public void actionPerformed(ActionEvent evt) {
        Object source = evt.getSource( );
        if (source == b1)
            label.setText("Rosencrantz");
        else if (source == b2)
            label.setText(b2.getActionCommand( ));
    }
}