JAVA 工作指南 可以说是程序员必备的东西哦

				/* 				 * Java(TM) SE 6 version.				 */								import java.applet.*;				import java.awt.*;				import javax.swing.*;				import java.awt.event.*;								public class Sender extends JApplet 				                    implements ActionListener {				    private String myName;				    private JTextField nameField;				    private JTextArea status;								    public void init() {				        //Execute a job on the event-dispatching thread:				        //creating this applet's GUI.				        try {				            SwingUtilities.invokeAndWait(new Runnable() {				                public void run() {				                    createGUI();				                }				            });				        } catch (Exception e) {				            System.err.println("createGUI didn't successfully complete");				        }				    }								    private void createGUI() {				        JPanel contentPane = new JPanel(new GridBagLayout());				        contentPane.setBorder(BorderFactory.createCompoundBorder(				                                    BorderFactory.createLineBorder(Color.BLACK),				                                    BorderFactory.createEmptyBorder(10,10,5,5)));				        setContentPane(contentPane);				        				        GridBagConstraints c = new GridBagConstraints();				        c.insets = new Insets(0,0,5,5);								        JLabel receiverLabel = new JLabel("Receiver name:", 				                                          JLabel.TRAILING);				        add(receiverLabel, c);								        nameField = new JTextField(getParameter("RECEIVERNAME"),				                                                10);				        c.fill = GridBagConstraints.HORIZONTAL;				        c.weightx = 1.0;				        add(nameField, c);				        nameField.addActionListener(this);								        JButton button = new JButton("Send message");				        c.gridwidth = GridBagConstraints.REMAINDER; //end row				        c.anchor = GridBagConstraints.LINE_START; //stick to the 				                                                  //text field				        c.fill = GridBagConstraints.NONE; //keep the button 				                                          //small				        c.weightx = 0.0;				        add(button, c);				        button.addActionListener(this);								        status = new JTextArea(5, 60);				        status.setEditable(false);				        c.anchor = GridBagConstraints.CENTER; //reset to the default				        c.fill = GridBagConstraints.BOTH; //make this big				        c.weighty = 1.0;				        add(new JScrollPane(status), c);								        myName = getParameter("NAME");				        JLabel senderLabel = new JLabel("(My name is " + myName + ".)",				                                        JLabel.CENTER);				        c.weightx = 0.0;				        c.weighty = 0.0;				        add(senderLabel, c);				    }								    public void actionPerformed(ActionEvent event) {				        Applet receiver = null;				        String receiverName = nameField.getText(); //Get name to 				                                                   //search for.				        receiver = getAppletContext().getApplet(receiverName);				        if (receiver != null) {				            //Use the instanceof operator to make sure the applet				            //we found is a Receiver object.				            if (!(receiver instanceof Receiver)) {				                status.append("Found applet named "				                              + receiverName + ", "				                              + "but it's not a Receiver object.\n");				            } else {				                status.append("Found applet named "				                              + receiverName + "\n"				                              + "  Sending message to it.\n");				                //Cast the receiver to be a Receiver object				                //(instead of just an Applet object) so that the				                //compiler will let us call a Receiver method.				                ((Receiver)receiver).processRequestFrom(myName);				            }				        } else {				            if (receiverName == null || receiverName.length() == 0) {				                receiverName = "";				            }				            status.append("Couldn't find any applet named "				                          + receiverName + ".\n");				        }				    }								    public String getAppletInfo() {				        return "Sender by Kathy Walrath";				    }				}