Exec 66 快捷键设置

import javax.swing.*;

import java.awt.event.*;
import java.awt.*;
public class Exec66 extends JFrame implements ActionListener{
JTextField text;
static int i=0;
public Exec66() {
this.setTitle("Test");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setBounds(100, 100, 200, 300);
this.setLocationRelativeTo(null);

JMenuBar bar = new JMenuBar();

JMenu file = new JMenu("文件");
JMenu edit = new JMenu("编辑");
JMenu help = new JMenu("帮助");

JMenuItem f1 = new JMenuItem("OPEN");
JMenuItem f2 = new JMenuItem("保存");
JMenuItem f3 = new JMenuItem("退出");
JMenuItem e1 = new JMenuItem("复制");
JMenuItem e2 = new JMenuItem("粘贴");
JMenuItem e3 = new JMenuItem("全选");
JMenuItem h1 = new JMenuItem("帮助");
JMenuItem h2 = new JMenuItem("关于");

f1.setMnemonic('O');
f1.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N,InputEvent.CTRL_MASK));

f1.addActionListener(this);
f2.addActionListener(this);
f3.addActionListener(this);
e1.addActionListener(this);
e2.addActionListener(this);
e3.addActionListener(this);
h1.addActionListener(this);
h2.addActionListener(this);

this.setJMenuBar(bar);
bar.add(file);
bar.add(edit);
bar.add(help);

file.add(f1);file.add(f2);file.add(f3);
edit.add(e1);edit.add(e2);edit.add(e3);
help.add(h1);help.add(h2);

text = new JTextField(10);

add(text);

this.setVisible(true);

JButton bt = new JButton("BUTTON");
bt.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e ) {
text.setText("BUTTON "+(i++));
}
});
bt.setMnemonic(KeyEvent.VK_O);
add(bt,BorderLayout.SOUTH);
}

public static void main(String[] args) {
new Exec66();

}
public void actionPerformed(ActionEvent e) {
JMenuItem item = (JMenuItem)(e.getSource());
if (item.getActionCommand().equals("退出")) System.exit(1);
else text.setText(item.getActionCommand());
}

}