java菜单栏 怎么加监听

我帮你编了个最简单的例子。代码中已经标志了关键性代码。你可以运行看看的^_^ import java.awt.BorderLayout; import javax.swing.JPanel; import javax.swing.JFrame; import javax.swing.JToolBar; import java.awt.Rectangle; import javax.swing.JMenuBar; import javax.swing.JMenu; import javax.swing.JMenuItem; public class MyItem extends JFrame { private static final long serialVersionUID = 1L; private JPanel jContentPane = null; private JMenuBar jJMenuBar = null; private JMenu jMenu = null; private JMenuItem jMenuItem = null; /** * This is the default constructor */ public MyItem() { super(); initialize(); } /** * This method initializes this * * @return void */ private void initialize() { this.setSize(300, 200); this.setJMenuBar(getJJMenuBar()); this.setContentPane(getJContentPane()); this.setTitle("JFrame"); this.addWindowListener(new java.awt.event.WindowAdapter() { public void windowClosing(java.awt.event.WindowEvent e) { System.exit(0); } }); } /** * This method initializes jContentPane * * @return javax.swing.JPanel */ private JPanel getJContentPane() { if (jContentPane == null) { jContentPane = new JPanel(); jContentPane.setLayout(null); } return jContentPane; } /** * This method initializes jJMenuBar * * @return javax.swing.JMenuBar */ private JMenuBar getJJMenuBar() { if (jJMenuBar == null) { jJMenuBar = new JMenuBar(); jJMenuBar.add(getJMenu()); } return jJMenuBar; } /** * This method initializes jMenu * * @return javax.swing.JMenu */ private JMenu getJMenu() { if (jMenu == null) { jMenu = new JMenu(); jMenu.setText("菜单"); jMenu.add(getJMenuItem()); } return jMenu; } /** * This method initializes jMenuItem * * @return javax.swing.JMenuItem */ private JMenuItem getJMenuItem() { if (jMenuItem == null) { jMenuItem = new JMenuItem(); jMenuItem.setText("弹出窗口"); /* * 这一块是关键性代码！！！！！！ * 这一块是关键性代码！！！！！！ */ jMenuItem.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent e) { ///MyOut是你要弹出的窗体的类 MyOut myout=new MyOut(); } }); /* * 这一块是关键性代码！！！！！！ */ } return jMenuItem; } }