import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class JListFrame extends JFrame 
{
    private DefaultListModel model = new DefaultListModel();
    private JList list = new JList(model);
    private JButton btn = new JButton("添加");
    
    public JListFrame()
    {
        this.setLayout(new BorderLayout());
        
        add(new JScrollPane(list), BorderLayout.CENTER);
        add(btn, BorderLayout.SOUTH);
        btn.addActionListener(new ActionListener()
            {
                public void actionPerformed(ActionEvent event)
                {
                    model.addElement("data");
                }
            });
    }
    
    public static void main(String[] args)
    {
        JFrame frame = new JListFrame();
        frame.pack();
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}