清华大学：JAVA教学课件：8-6

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class JListDemo {
JFrame frame = new JFrame ("JList Demo");
JList list;
DefaultListModel listModel;
JPanel panel;
JTextField tf;
JButton button;
public static void main(String args[]){
JListDemo ld = new JListDemo();
ld.go();
}
public void go() {
listModel = new DefaultListModel();
//添加可选项
listModel.addElement("one ");
listModel.addElement("two ");
listModel.addElement("three ");
listModel.addElement("four ");
list = new JList(listModel); //创建列表
//将列表放入滚动窗格JScrollPane中
JScrollPane jsp = new JScrollPane(list,
JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
Container cp = frame.getContentPane();
cp.add(jsp);
tf = new JTextField(15); //输入新可选项的文本域
button = new JButton("add new item");
button.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
listModel.addElement(tf.getText()); //添加新的可选项
}
});
panel = new JPanel();
panel.add(tf);
panel.add(button);
cp.add(panel,BorderLayout.SOUTH);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
}