package ex10_05;import java.awt.*;import java.awt.event.*;import javax.swing.*;import java.util.*;public class Frame1 extends JFrame {  JPanel contentPane;  JComboBox jComboBox1 = new JComboBox();  JScrollPane jScrollPane1 = new JScrollPane();  JList jList1 = new JList();  JButton jButton1 = new JButton();  JButton jButton2 = new JButton();  /**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();    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);      }    });    jComboBox1.setBounds(new Rectangle(184, 27, 127, 23));    jScrollPane1.setBounds(new Rectangle(28, 26, 139, 102));    jButton1.setText("加入");    jButton1.setBounds(new Rectangle(204, 60, 79, 29));    jButton1.addActionListener(new java.awt.event.ActionListener() {      public void actionPerformed(ActionEvent e) {        jButton1_actionPerformed(e);      }    });    jButton2.setText("刪除");    jButton2.setBounds(new Rectangle(205, 96, 79, 29));    jButton2.addActionListener(new java.awt.event.ActionListener() {      public void actionPerformed(ActionEvent e) {        jButton2_actionPerformed(e);      }    });    contentPane.add(jComboBox1, null);    contentPane.add(jScrollPane1, null);    contentPane.add(jButton2, null);    contentPane.add(jButton1, 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);    }  }  //Vector myvector = new Vector();  void this_windowOpened(WindowEvent e) { //加入列表項目 jComboBox1.addItem("香蕉"); jComboBox1.addItem("芭蕉"); jComboBox1.addItem("鳳梨"); jComboBox1.addItem("蘋果"); jComboBox1.addItem("葡萄");  }  void jButton1_actionPerformed(ActionEvent e) {//加入綜合列表框內的資料成為Vector對象的新元素myvector.addElement(jComboBox1.getSelectedItem());//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) //先確認是否選定了項目{//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);}  }}