package sayhello;import java.awt.*;import java.awt.event.*;import javax.swing.*;public class Frame1 extends JFrame {  JPanel contentPane;  FlowLayout flowLayout1 = new FlowLayout();  Label label1 = new Label();  TextField textField1 = new TextField();  Label label2 = new Label();  TextField textField2 = new TextField();  Button button1 = new Button();  Button button2 = new Button();  Choice choice1 = new Choice();  Label label3 = new Label();  /**Construct the frame*/  public Frame1() {    enableEvents(AWTEvent.WINDOW_EVENT_MASK);    try {      jbInit();    }    catch(Exception e) {      e.printStackTrace();    }  }  /**Component initialization*/  private void jbInit() throws Exception  {    //setIconImage(Toolkit.getDefaultToolkit().createImage(Frame1.class.getResource("[Your Icon]")));    contentPane = (JPanel) this.getContentPane();    label1.setText("姓名：");    contentPane.setLayout(flowLayout1);    this.setResizable(false);    this.setSize(new Dimension(359, 110));    this.setTitle("Say Hello");    textField1.setColumns(8);    label2.setText("性別：");    textField2.setColumns(12);    textField2.setEditable(false);    button1.setLabel("確定");    button1.addActionListener(new java.awt.event.ActionListener() {      public void actionPerformed(ActionEvent e) {        button1_actionPerformed(e);      }    });    button2.setLabel("清除");    button2.addActionListener(new java.awt.event.ActionListener() {      public void actionPerformed(ActionEvent e) {        button2_actionPerformed(e);      }    });    flowLayout1.setHgap(15);    flowLayout1.setVgap(10);    choice1.setComponentOrientation(null);    label3.setText("問候語：");    contentPane.add(label1, null);    contentPane.add(textField1, null);    contentPane.add(label2, null);    contentPane.add(choice1, null);    contentPane.add(label3, null);    contentPane.add(textField2, null);    contentPane.add(button1, null);    contentPane.add(button2, null);    choice1.add("--男--");    choice1.add("--女--");  }  /**Overridden so we can exit when window is closed*/  protected void processWindowEvent(WindowEvent e) {    super.processWindowEvent(e);    if (e.getID() == WindowEvent.WINDOW_CLOSING) {      System.exit(0);    }  }  void button1_actionPerformed(ActionEvent e) {  String s = new String();  s = textField1.getText();  if (choice1.getSelectedIndex() == 0)    s = s + "先生，";  else    s = s + "女士，";  s = s + "你好！";  textField2.setText(s);  }  void button2_actionPerformed(ActionEvent e) {  textField1.setText("");  textField2.setText("");  }}