java学习笔记_GUI(2)

 1 import javax.swing.*;
 2 import java.awt.event.*;
 3 
 4 class Gui implements ActionListener{
 5     
 6     JButton button = new JButton("click me");
 7 
 8     public void show() {
 9         JFrame frame = new JFrame();
10         
11         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
12         
13         frame.getContentPane().add(button);
14         frame.setSize(300, 200);
15         frame.setVisible(true);
16         
17         button.addActionListener(this);
18     }
19     
20     public void actionPerformed( ActionEvent event ) {
21         button.setText("I‘ve been clicked!");
22     }
23 }
24 
25 class GuiTest {
26     public static void main( String[] args ) {
27         Gui gui = new Gui();
28         gui.show();
29     }
30 }