menutest.java

这个是Java的swing相关的典型的源码

// Demonstrating the MenuListener 


import javax.swing.ButtonGroup;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JRadioButtonMenuItem;
import javax.swing.event.MenuEvent;
import javax.swing.event.MenuListener;

public class MenuTest extends JFrame {
  public MenuTest() {
    super();

    MenuListener listener = new MenuListener() {
      public void menuCanceled(MenuEvent e) {
        dumpInfo("Canceled", e);
      }

      public void menuDeselected(MenuEvent e) {
        dumpInfo("Deselected", e);
      }

      public void menuSelected(MenuEvent e) {
        dumpInfo("Selected", e);
      }

      private void dumpInfo(String s, MenuEvent e) {
        JMenu menu = (JMenu) e.getSource();
        System.out.println(s + ": " + menu.getText());
      }
    };

    JMenu fileMenu = new JMenu("File");
    fileMenu.addMenuListener(listener);
    fileMenu.add(new JMenuItem("Open"));
    fileMenu.add(new JMenuItem("Close"));
    fileMenu.add(new JMenuItem("Exit"));
    JMenu helpMenu = new JMenu("Help");
    helpMenu.addMenuListener(listener);
    helpMenu.add(new JMenuItem("About MenuTest"));
    helpMenu.add(new JMenuItem("Class Hierarchy"));
    helpMenu.addSeparator();
    helpMenu.add(new JCheckBoxMenuItem("Balloon Help"));
    JMenu subMenu = new JMenu("Categories");
    subMenu.addMenuListener(listener);
    JRadioButtonMenuItem rb;
    ButtonGroup group = new ButtonGroup();
    subMenu.add(rb = new JRadioButtonMenuItem("A Little Help", true));
    group.add(rb);
    subMenu.add(rb = new JRadioButtonMenuItem("A Lot of Help"));
    group.add(rb);
    helpMenu.add(subMenu);
    JMenuBar mb = new JMenuBar();
    mb.add(fileMenu);
    mb.add(helpMenu);
    setJMenuBar(mb);
  }

  public static void main(String args[]) {
    JFrame frame = new MenuTest();
    frame.setSize(300, 300);
    frame.show();
  }
}