最好的网吧计费管理，适用于初学者。非常经典的素材。不要错过啊·

package com.netbar.view; import javax.swing.*; import java.awt.*; import java.awt.event.*; public class NetBarFrame extends JFrame{ public static final int DEFAULT_WIDTH = 400; public static final int DEFAULT_HEIGHT = 300; JMenuBar mnubar=new JMenuBar(); JMenu mnuUse = new JMenu(); JMenuItem mnuOnline = new JMenuItem(); JMenuItem mnuEndline = new JMenuItem(); JMenu mnuHelp = new JMenu(); JMenuItem mnuAbout = new JMenuItem(); JMenu mnuExit=new JMenu(); JLabel jLabel1 = new JLabel(); JLabel jLabel2 = new JLabel(); CardLayout cardLayout1 = new CardLayout(); CardLayout cardLayout2 = new CardLayout(); public NetBarFrame() { try { jbInit(); } catch (Exception ex) { ex.printStackTrace(); } } private void jbInit() throws Exception { mnuUse.setText("使用"); mnuOnline.setText("上机"); mnuEndline.setText("下机"); mnuAbout.setText("关于"); mnuHelp.setText("帮助"); mnuExit.setText("退出"); jLabel1.setFont(new java.awt.Font("Dialog", Font.PLAIN, 18)); jLabel1.setText("欢迎使用网吧计费管理系统"); jLabel1.setBounds(new Rectangle(77, 50, 236, 69)); this.getContentPane().setLayout(null); jLabel2.setFont(new java.awt.Font("Dialog", Font.PLAIN, 15)); jLabel2.setText("北大青鸟制作"); jLabel2.setBounds(new Rectangle(127, 164, 143, 51)); mnubar.add(mnuUse); mnuUse.add(mnuOnline); mnubar.add(mnuHelp); mnuHelp.add(mnuAbout); mnubar.add(mnuExit); this.getContentPane().add(jLabel2, null); this.getContentPane().add(jLabel1, null); } }