package ex10_03;import java.awt.*;import java.awt.event.*;import javax.swing.*;import java.util.*;public class Frame1 extends JFrame {  JPanel contentPane;  JButton jButton1 = new JButton();  JTextField jTextField1 = new JTextField();  JScrollPane jScrollPane1 = new JScrollPane();  JList jList1 = new JList();  JButton jButton2 = new JButton();  JLabel jLabel1 = new JLabel();  JLabel jLabel2 = new JLabel();  /**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();    jButton1.setText("加入");    jButton1.setBounds(new Rectangle(158, 27, 79, 29));    jButton1.addActionListener(new java.awt.event.ActionListener() {      public void actionPerformed(ActionEvent e) {        jButton1_actionPerformed(e);      }    });    contentPane.setLayout(null);    this.setSize(new Dimension(400, 300));    this.setTitle("Frame Title");    this.addWindowListener(new java.awt.event.WindowAdapter() {      public void windowOpened(WindowEvent e) {        this_windowOpened(e);      }    });    jTextField1.setBounds(new Rectangle(31, 27, 112, 23));    jScrollPane1.setBounds(new Rectangle(32, 83, 110, 100));    jButton2.setText("刪除選項");    jButton2.setBounds(new Rectangle(150, 126, 88, 29));    jButton2.addActionListener(new java.awt.event.ActionListener() {      public void actionPerformed(ActionEvent e) {        jButton2_actionPerformed(e);      }    });    jLabel1.setText("請輸入您喜歡吃的水果");    jLabel1.setBounds(new Rectangle(24, 5, 133, 19));    jLabel2.setText("您輸入的水果有:");    jLabel2.setBounds(new Rectangle(38, 62, 97, 19));    jList1.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);    contentPane.add(jButton1, null);    contentPane.add(jTextField1, null);    contentPane.add(jButton2, null);    contentPane.add(jScrollPane1, null);    contentPane.add(jLabel1, null);    contentPane.add(jLabel2, null);    jScrollPane1.getViewport().add(jList1, null);  }  /**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);    }  }  //建立Vector對象來記錄待選項目  Vector myvector = new Vector();  void this_windowOpened(WindowEvent e) {//添加向量對象的元素myvector.addElement("芭蕉");myvector.addElement("香蕉");//將向量對象內的元素加入jList組件中成為待選項目jList1.setListData(myvector);  }  void jButton1_actionPerformed(ActionEvent e) {//加入文本框內的資料成為Vector對象的新元素myvector.addElement(jTextField1.getText());//重新定義jList組件內的待選項目jList1.setListData(myvector);  }  void jButton2_actionPerformed(ActionEvent e) {int index;//取回jList組件中被選取的項目索引index=jList1.getSelectedIndex();if (index>=0) //先確認是否有選定項目{  //依項目索引刪除Vector對象內的元素  myvector.removeElementAt(index);  //重新定義jList組件內的待選項目  jList1.setListData(myvector);}  }}