Java JList用法二

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.event.*;

public class Chap23_3 {

static JFrame frm=new JFrame("JList demo");

static Container cp=frm.getContentPane();

static JButton btn=new JButton("GET Colors");

static JList lst=new JList();

public static void main(String args[])

{

cp.setLayout(new BorderLayout());

cp.add(btn, BorderLayout.SOUTH);

cp.add(new JScrollPane(lst));

btn.addActionListener(new ActLis());

lst.addListSelectionListener(new LSLis());

frm.setSize(200, 155);

frm.setVisible(true);

}

static class ActLis implements ActionListener

{

public void actionPerformed(ActionEvent e)

{

 String s[]={"RED","GREE","BLUE","PINK","YELLOW","CYAN","GRAY"};

    lst.setListData(s);

}

}

static class LSLis implements ListSelectionListener

{

 public void valueChanged(ListSelectionEvent e)

 {

  int color=lst.getSelectedIndex();

  switch(color)

  {

  case 0:lst.setBackground(Color.RED); break;

  case 1:lst.setBackground(Color.GREEN); break;

  case 2:lst.setBackground(Color.BLUE); break;

  case 3:lst.setBackground(Color.PINK); break;

  case 4:lst.setBackground(Color.YELLOW); break;

  case 5:lst.setBackground(Color.CYAN); break;

  case 6:lst.setBackground(Color.GRAY); break;

  }

 

 }

}

 

}