希望对各位有所帮助

				import java.awt.*;
				import java.awt.event.*;
				import javax.swing.*;
				
				/**
				 * Title: 
				 * Description: 
				 * Copyright: Copyright (c) 2003
				 * Company: 
				 * @author not attributable
				 * @version 1.0
				 */
				
				public class MainMenu
				    extends JFrame {
				  JPanel contentPane;
				  JMenuBar jMenuBar = new JMenuBar();
				  JMenu jMenuSystem = new JMenu();
				  JMenuItem jMItemExit = new JMenuItem();
				  JMenu jMenuHouseManager = new JMenu();
				  JMenuItem jMItemBuildInfo = new JMenuItem();
				  BorderLayout borderLayout1 = new BorderLayout();
				  JMenuItem jMItemCodeSet = new JMenuItem();
				  JMenuItem jMItemHouseInfo = new JMenuItem();
				  JMenu jMenuOwner = new JMenu();
				  JMenuItem jMItemBasicInfo = new JMenuItem();
				  JMenuItem jMItemFamilyInfo = new JMenuItem();
				  JMenu jMenuQuery = new JMenu();
				  JMenuItem jMItemHouseQuery = new JMenuItem();
				  JMenuItem jMItemQuery = new JMenuItem();
				  JMenuItem jMItemComboQuery = new JMenuItem();
				
				  //Construct the frame
				  public MainMenu() {
				    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
				    try {
				      jbInit();
				    }
				    catch (Exception e) {
				      e.printStackTrace();
				    }
				  }
				
				  //Component initialization
				  private void jbInit() throws Exception {
				    contentPane = (JPanel)this.getContentPane();
				    contentPane.setLayout(borderLayout1);
				    //this.getContentPane().setBackground(SystemColor.controlLtHighlight);
				    this.setSize(new Dimension(576, 372));
				    this.setTitle("房产管理系统");
				    jMenuSystem.setBackground(SystemColor.controlHighlight);
				    jMenuSystem.setFont(new java.awt.Font("宋体", 0, 12));
				    jMenuSystem.setText("系统管理");
				    jMItemExit.setBackground(SystemColor.controlHighlight);
				    jMItemExit.setFont(new java.awt.Font("宋体", 0, 12));
				    jMItemExit.setText("退出");
				    jMItemExit.addActionListener(new MainMenu_jMItemExit_actionAdapter(this));
				    jMenuHouseManager.setBackground(SystemColor.controlHighlight);
				    jMenuHouseManager.setFont(new java.awt.Font("宋体", 0, 12));
				    jMenuHouseManager.setFocusPainted(true);
				    jMenuHouseManager.setText("房产管理");
				    jMItemBuildInfo.setBackground(SystemColor.controlHighlight);
				    jMItemBuildInfo.setFont(new java.awt.Font("宋体", 0, 12));
				    jMItemBuildInfo.setText("房产信息维护");
				    jMItemBuildInfo.addActionListener(new
				                                      MainMenu_jMItemBuildInfo_actionAdapter(this));
				    jMItemCodeSet.setBackground(SystemColor.controlHighlight);
				    jMItemCodeSet.setFont(new java.awt.Font("宋体", 0, 12));
				    jMItemCodeSet.setText("代码表设置");
				    jMItemCodeSet.addActionListener(new MainMenu_jMItemCodeSet_actionAdapter(this));
				    jMenuSystem.addSeparator();
				    jMenuBar.setFont(new java.awt.Font("宋体", 0, 12));
				    jMItemHouseInfo.setBackground(SystemColor.controlHighlight);
				    jMItemHouseInfo.setFont(new java.awt.Font("宋体", 0, 12));
				    jMItemHouseInfo.setText("住房信息维护");
				    jMItemHouseInfo.addActionListener(new
				                                      MainMenu_jMItemHouseInfo_actionAdapter(this));
				    jMenuOwner.setBackground(SystemColor.controlHighlight);
				    jMenuOwner.setFont(new java.awt.Font("宋体", 0, 12));
				    jMenuOwner.setText("住户管理");
				    jMItemBasicInfo.setBackground(SystemColor.controlHighlight);
				    jMItemBasicInfo.setFont(new java.awt.Font("宋体", 0, 12));
				    jMItemBasicInfo.setToolTipText("");
				    jMItemBasicInfo.setText("基本信息维护");
				    jMItemBasicInfo.addActionListener(new
				                                      MainMenu_jMItemBasicInfo_actionAdapter(this));
				    jMItemFamilyInfo.setBackground(SystemColor.controlHighlight);
				    jMItemFamilyInfo.setFont(new java.awt.Font("宋体", 0, 12));
				    jMItemFamilyInfo.setText("家庭信息维护");
				    jMItemFamilyInfo.addActionListener(new
				                                       MainMenu_jMItemFamilyInfo_actionAdapter(this));
				    jMenuQuery.setFont(new java.awt.Font("宋体", 0, 12));
				    jMenuQuery.setText("查询");
				    jMItemHouseQuery.setBackground(SystemColor.controlHighlight);
				    jMItemHouseQuery.setFont(new java.awt.Font("宋体", 0, 12));
				    jMItemHouseQuery.setText("房产信息查询");
				    jMItemQuery.setBackground(SystemColor.controlHighlight);
				    jMItemQuery.setFont(new java.awt.Font("宋体", 0, 12));
				    jMItemQuery.setText("信息查询");
				    jMItemQuery.addActionListener(new
				                                       MainMenu_jMItemQuery_actionAdapter(this));
				    jMItemComboQuery.setFont(new java.awt.Font("宋体", 0, 12));
				    jMItemComboQuery.setText("组合查询");
				    jMItemComboQuery.addActionListener(new
				                                       MainMenu_jMItemComboQuery_actionAdapter(this));
				    jMenuSystem.add(jMItemCodeSet);
				    jMenuSystem.addSeparator();
				    jMenuSystem.add(jMItemExit);
				    jMenuHouseManager.add(jMItemBuildInfo);
				    jMenuHouseManager.add(jMItemHouseInfo);
				    jMenuBar.add(jMenuSystem);
				    jMenuBar.add(jMenuHouseManager);
				    jMenuBar.add(jMenuOwner);
				    jMenuBar.add(jMenuQuery);
				    jMenuOwner.add(jMItemBasicInfo);
				    jMenuOwner.add(jMItemFamilyInfo);
				    jMenuQuery.add(jMItemQuery);
				    this.setJMenuBar(jMenuBar);
				
				  }
				
				  void jMItemCodeSet_actionPerformed(ActionEvent e) {
				    CodeSet codeSet = new CodeSet();
				    Dimension dlgSize = codeSet.getPreferredSize();
				    Dimension frmSize = getSize();
				    Point loc = getLocation();
				    codeSet.setLocation( (frmSize.width - dlgSize.width) / 2 + loc.x,
				                        (frmSize.height - dlgSize.height) / 2 + loc.y);
				    codeSet.pack();
				    codeSet.show();
				
				  }
				
				  void jMItemExit_actionPerformed(ActionEvent e) {
				    System.exit(0);
				  }
				
				  void jMItemBuildInfo_actionPerformed(ActionEvent e) {
				    BuildInfo buildInfo = new BuildInfo();
				    Dimension dlgSize = buildInfo.getPreferredSize();
				    Dimension frmSize = getSize();
				    Point loc = getLocation();
				    buildInfo.setLocation( (frmSize.width - dlgSize.width) / 2 + loc.x,
				                          (frmSize.height - dlgSize.height) / 2 + loc.y);
				    buildInfo.pack();
				    buildInfo.show();
				
				  }
				
				  void jMItemHouseInfo_actionPerformed(ActionEvent e) {
				    HouseInfo houseInfo = new HouseInfo();
				    Dimension dlgSize = houseInfo.getPreferredSize();
				    Dimension frmSize = getSize();
				    Point loc = getLocation();
				    houseInfo.setLocation( (frmSize.width - dlgSize.width) / 2 + loc.x,
				                          (frmSize.height - dlgSize.height) / 2 + loc.y);
				    houseInfo.pack();
				    houseInfo.show();
				
				  }
				
				  void jMItemBasicInfo_actionPerformed(ActionEvent e) {
				    OwnerInfo ownerInfo = new OwnerInfo();
				    Dimension dlgSize = ownerInfo.getPreferredSize();
				    Dimension frmSize = getSize();
				    Point loc = getLocation();
				    ownerInfo.setLocation( (frmSize.width - dlgSize.width) / 2 + loc.x,
				                          (frmSize.height - dlgSize.height) / 2 + loc.y);
				    ownerInfo.pack();
				    ownerInfo.show();
				
				  }
				
				  void jMItemFamilyInfo_actionPerformed(ActionEvent e) {
				    FamilyInfo familyInfo = new FamilyInfo();
				    Dimension dlgSize = familyInfo.getPreferredSize();
				    Dimension frmSize = getSize();
				    Point loc = getLocation();
				    familyInfo.setLocation( (frmSize.width - dlgSize.width) / 2 + loc.x,
				                           (frmSize.height - dlgSize.height) / 2 + loc.y);
				    familyInfo.pack();
				    familyInfo.show();
				
				  }
				
				
				  void jMItemQuery_actionPerformed(ActionEvent e) {
				    Query query = new Query();
				    Dimension dlgSize = query.getPreferredSize();
				    Dimension frmSize = getSize();
				    Point loc = getLocation();
				    query.setLocation( (frmSize.width - dlgSize.width) / 2 + loc.x,
				                           (frmSize.height - dlgSize.height) / 2 + loc.y);
				    query.pack();
				    query.show();
				
				  }
				
				  void jMItemComboQuery_actionPerformed(ActionEvent e) {
				
				  }
				
				}
				
				class MainMenu_jMItemCodeSet_actionAdapter
				    implements java.awt.event.ActionListener {
				  MainMenu adaptee;
				
				  MainMenu_jMItemCodeSet_actionAdapter(MainMenu adaptee) {
				    this.adaptee = adaptee;
				  }
				
				  public void actionPerformed(ActionEvent e) {
				    adaptee.jMItemCodeSet_actionPerformed(e);
				  }
				}
				
				class MainMenu_jMItemExit_actionAdapter
				    implements java.awt.event.ActionListener {
				  MainMenu adaptee;
				
				  MainMenu_jMItemExit_actionAdapter(MainMenu adaptee) {
				    this.adaptee = adaptee;
				  }
				
				  public void actionPerformed(ActionEvent e) {
				    adaptee.jMItemExit_actionPerformed(e);
				  }
				}
				
				class MainMenu_jMItemBuildInfo_actionAdapter
				    implements java.awt.event.ActionListener {
				  MainMenu adaptee;
				
				  MainMenu_jMItemBuildInfo_actionAdapter(MainMenu adaptee) {
				    this.adaptee = adaptee;
				  }
				
				  public void actionPerformed(ActionEvent e) {
				    adaptee.jMItemBuildInfo_actionPerformed(e);
				  }
				}
				
				class MainMenu_jMItemHouseInfo_actionAdapter
				    implements java.awt.event.ActionListener {
				  MainMenu adaptee;
				
				  MainMenu_jMItemHouseInfo_actionAdapter(MainMenu adaptee) {
				    this.adaptee = adaptee;
				  }
				
				  public void actionPerformed(ActionEvent e) {
				    adaptee.jMItemHouseInfo_actionPerformed(e);
				  }
				}
				
				class MainMenu_jMItemBasicInfo_actionAdapter
				    implements java.awt.event.ActionListener {
				  MainMenu adaptee;
				
				  MainMenu_jMItemBasicInfo_actionAdapter(MainMenu adaptee) {
				    this.adaptee = adaptee;
				  }
				
				  public void actionPerformed(ActionEvent e) {
				    adaptee.jMItemBasicInfo_actionPerformed(e);
				  }
				}
				
				class MainMenu_jMItemFamilyInfo_actionAdapter
				    implements java.awt.event.ActionListener {
				  MainMenu adaptee;
				
				  MainMenu_jMItemFamilyInfo_actionAdapter(MainMenu adaptee) {
				    this.adaptee = adaptee;
				  }
				
				  public void actionPerformed(ActionEvent e) {
				    adaptee.jMItemFamilyInfo_actionPerformed(e);
				  }
				}
				
				
				
				class MainMenu_jMItemQuery_actionAdapter
				    implements java.awt.event.ActionListener {
				  MainMenu adaptee;
				
				  MainMenu_jMItemQuery_actionAdapter(MainMenu adaptee) {
				    this.adaptee = adaptee;
				  }
				
				  public void actionPerformed(ActionEvent e) {
				    adaptee.jMItemQuery_actionPerformed(e);
				  }
				}
				
				class MainMenu_jMItemComboQuery_actionAdapter
				    implements java.awt.event.ActionListener {
				  MainMenu adaptee;
				
				  MainMenu_jMItemComboQuery_actionAdapter(MainMenu adaptee) {
				    this.adaptee = adaptee;
				  }
				
				  public void actionPerformed(ActionEvent e) {
				    adaptee.jMItemComboQuery_actionPerformed(e);
				  }
				}