在java中怎么实现一个按钮对两个事件监听

你问的是JAVASE么？
使用Button的addActionListener就好了
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JFrame frame = new JFrame();
frame.setTitle("my frame");
frame.setBounds(0, 0, 200, 100);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JButton btn1 = new JButton("OpenBrowser");
JButton btn2 = new JButton("OpenNotepad");
JPanel panel = new JPanel(new FlowLayout(4));

btn1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if(e.getActionCommand().equals("OpenBrowser")) {
try {
Process p = Runtime.getRuntime().exec("explorer http://www.qq.com");
p.destroy();
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
}) ;

btn2.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent e) {
try {
Process p = Runtime.getRuntime().exec("notepad");
p.destroy();
} catch (IOException e1) {
e1.printStackTrace();
}
}
});

panel.add(btn1);
panel.add(btn2);

frame.add(panel);
frame.setVisible(true);