button.java

Java JButton的基本使用方法

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

public class button implements ActionListener { 
Frame f; 
Button b1, b2, b3; 
Panel p; 

public static void main(String[] args) { 
button er = new button(); 
er.go(); 
} 

public void go() { 
f = new Frame(); 
b1 = new Button(); 
p = new Panel(); 
b1.setBackground(Color.red); 
b1.setActionCommand("red"); 
b1.addActionListener(this); 
p.add(b1); 

b2 = new Button(); 
b2.setActionCommand("yellow"); 
b2.setBackground(Color.yellow); 
b2.addActionListener(this); 
p.add(b2); 

b3 = new Button(); 
b3.setBackground(Color.green); 
b3.setActionCommand("green"); 
b3.addActionListener(this); 
p.add(b3); 
f.add(p, BorderLayout.SOUTH); 
f.pack(); 
f.setVisible(true); 
this.addWindowListener(new WindowAdapter() {
	public void windowClosing(WindowEvent e) {
		System.exit(0);
	}
});
}


private void addWindowListener(WindowAdapter windowAdapter) {
	// TODO Auto-generated method stub
	
}

public void actionPerformed(ActionEvent e) { 
if( e.getActionCommand().equals("red")){ 
f.setBackground(Color.red); 
} 
if( e.getActionCommand().equals("yellow")){ 
f.setBackground(Color.yellow); 
} 
if( e.getActionCommand().equals("green")){ 
f.setBackground(Color.green); 
} 
} 

}