java源代码：220个JAVA初学者实例集合

package chat; import java.awt.*; import java.awt.event.*; import javax.swing.*; import com.borland.jbcl.layout.*; import javax.swing.border.*; import java.lang.Exception; import java.net.*; import java.io.*; import java.util.Date; import javax.swing.event.*; /** * <p>Title: 使用JAVA制作的局域网聊天程序</p> * <p>Description: 我们的JAVA作业</p> * <p>Copyright: Copyright (c) 2003</p> * <p>Company: </p> * @author RoadAhead * @version 1.0 */ public class mainform extends JFrame { private JPanel contentPane; static JPanel jPanel1 = new JPanel(); private JPanel jPanel2 = new JPanel(); private JButton but_online = new JButton(); private BorderLayout borderLayout2 = new BorderLayout(); private JMenuBar jMenuBar1 = new JMenuBar(); static JSplitPane jsp8 = new JSplitPane(); private JPanel jPanel5 = new JPanel(); private JButton but_exit = new JButton(); private JMenu jMenu1 = new JMenu(); private JButton but_offline = new JButton(); private JButton but_about = new JButton(); private JPanel pan_state = new JPanel(); static JTextPane ed_input = new JTextPane(); private PaneLayout paneLayout1 = new PaneLayout(); private TitledBorder titledBorder1; private TitledBorder titledBorder2; static Label lab_uname = new Label(); static JLabel lab_uimage = new JLabel(); private JLabel jLabel2 = new JLabel(); private JLabel lab_info = new JLabel(); static final int PORT=5001; static String curuserip=""; static String curusername=""; static String curusericon=""; static String myname=""; static String myicon=""; static String myip; static String onstartset=""; static String filename="chatset.amy"; static String winstate="0"; static int maxStrCount=10000; static int onlinestate=2;//是否在线 1: 在线 2:断线 3: 离线 static String onofflinetime=""; //当离线时的回答 private JButton but_setup = new JButton(); static String[][] userlist;//用户列表 static JButton[] but_userlist; //用户图象按钮 private JScrollPane jsp = new JScrollPane(); static JPanel pan_userlist = new JPanel(); private TitledBorder titledBorder3; private PaneLayout paneLayout2 = new PaneLayout(); static JLabel lab_my = new JLabel(); private TitledBorder titledBorder4; newthread mythread=new newthread(); static DatagramPacket sendpacket,receivepacket; static DatagramSocket sendsocket,receivesocket; private JScrollPane jScrollPane1 = new JScrollPane(); static JTextArea ed_show = new JTextArea(); private JCheckBox cbo_bc = new JCheckBox(); private JScrollPane jScrollPane2 = new JScrollPane(); JOptionPane pane = new JOptionPane(); Date nowtime=new Date(); private JPopupMenu pop_menu = new JPopupMenu(); private JMenuItem jMenuItem1 = new JMenuItem(); private JMenuItem jMenuItem2 = new JMenuItem(); private JButton but_pause = new JButton(); private BoxLayout2 boxLayout21 = new BoxLayout2(); private Label label1 = new Label(); private Label label2 = new Label(); private BorderLayout borderLayout1 = new BorderLayout(); VerticalFlowLayout verticalFlowLayout1 = new VerticalFlowLayout(); //Construct the frame public mainform() { enableEvents(AWTEvent.WINDOW_EVENT_MASK); try { jbInit(); } catch(Exception e) { e.printStackTrace(); } } //Component initialization private void jbInit() throws Exception { try{ sendsocket=new DatagramSocket(); receivesocket=new DatagramSocket(5001); } catch(SocketException se){ se.printStackTrace(); } mainform.userlist=new String[1][5]; but_userlist=new JButton [1]; //setIconImage(Toolkit.getDefaultToolkit().createImage(mainform.class.getResource("[Your Icon]"))); contentPane = (JPanel) this.getContentPane(); titledBorder1 = new TitledBorder(""); titledBorder2 = new TitledBorder(""); titledBorder3 = new TitledBorder(""); titledBorder4 = new TitledBorder(""); contentPane.setLayout(borderLayout1); this.setSize(new Dimension(523, 356)); this.setTitle("我们的聊天程序 Alt+Enter 发送消息"); this.addWindowListener(new java.awt.event.WindowAdapter() { public void windowOpened(WindowEvent e) { this_windowOpened(e); } public void windowActivated(WindowEvent e) { } }); jPanel1.setBackground(Color.white); jPanel1.setLayout(borderLayout2); jPanel2.setBackground(Color.white); jPanel2.setBorder(titledBorder4); jPanel2.setToolTipText(""); jPanel2.setLayout(paneLayout2); but_online.setBackground(Color.white); but_online.setFont(new java.awt.Font("Serif", 0, 12)); but_online.setBorder(null); but_online.setHorizontalTextPosition(SwingConstants.CENTER); but_online.setText("在线"); but_online.setVerticalAlignment(SwingConstants.BOTTOM); but_online.setVerticalTextPosition(SwingConstants.BOTTOM); but_online.addMouseListener(new java.awt.event.MouseAdapter() { public void mouseExited(MouseEvent e) { but_online_mouseExited(e); } }); but_online.addMouseMotionListener(new java.awt.event.MouseMotionAdapter() { public void mouseMoved(MouseEvent e) { but_online_mouseMoved(e); } }); but_online.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(ActionEvent e) { but_online_actionPerformed(e); } }); jsp8.setBorder(null); jsp8.setContinuousLayout(true); jsp8.setDividerSize(2); jsp8.setLeftComponent(pan_userlist); but_exit.setBackground(Color.white); but_exit.setFont(new java.awt.Font("Serif", 0, 12)); but_exit.setBorder(null); but_exit.setHorizontalTextPosition(SwingConstants.CENTER); but_exit.setText("退出"); but_exit.setVerticalAlignment(SwingConstants.BOTTOM); but_exit.setVerticalTextPosition(SwingConstants.BOTTOM); but_exit.addMouseMotionListener(new java.awt.event.MouseMotionAdapter() { public void mouseMoved(MouseEvent e) { but_exit_mouseMoved(e); } }); but_exit.addMouseListener(new java.awt.event.MouseAdapter() { public void mousePressed(MouseEvent e) { but_exit_mousePressed(e); } public void mouseExited(MouseEvent e) { but_exit_mouseExited(e); } }); but_exit.addKeyListener(new java.awt.event.KeyAdapter() { public void keyTyped(KeyEvent e) { but_exit_keyTyped(e); } }); jMenu1.setText("文件"); but_offline.setBackground(Color.white); but_offline.setFont(new java.awt.Font("Serif", 0, 12)); but_offline.setBorder(null); but_offline.setHorizontalTextPosition(SwingConstants.CENTER); but_offline.setText("断线"); but_offline.setVerticalAlignment(SwingConstants.BOTTOM); but_offline.setVerticalTextPosition(SwingConstants.BOTTOM); but_offline.addMouseListener(new java.awt.event.MouseAdapter() { public void mouseExited(MouseEvent e) { but_offline_mouseExited(e); } }); but_offline.addMouseMotionListener(new java.awt.event.MouseMotionAdapter() { public void mouseMoved(MouseEvent e) { but_offline_mouseMoved(e); } }); but_offline.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(ActionEvent e) { but_offline_actionPerformed(e); } }); but_about.setBackground(Color.white); but_about.setFont(new java.awt.Font("Serif", 0, 12)); but_about.setBorder(null); but_about.setHorizontalTextPosition(SwingConstants.CENTER); but_about.setText("关于这个程序"); but_about.setVerticalAlignment(SwingConstants.BOTTOM); but_about.setVerticalTextPosition(SwingConstants.BOTTOM); but_about.addMouseListener(new java.awt.event.MouseAdapter() { public void mouseExited(MouseEvent e) { but_about_mouseExited(e); } }); but_about.addMouse