JList simple and practical

在这里插入代码片
import java.awt.BorderLayout;
import java.util.Calendar;
import java.util.Date;
import java.util.List;

import javax.swing.*;
import javax.swing.event.*;
import javax.swing.event.*;

public class Main1 extends JApplet{
	private JList list=new JList(new String[] {"1","2","3","4"});
	private JLabel label=new JLabel("dgs");
public Main1() {
	list.setSelectionMode(2);
	add(list,BorderLayout.NORTH);
	add(label);
list.addListSelectionListener(new ListSelectionListener() {

	@Override
	public void valueChanged(ListSelectionEvent arg0) {
		// TODO 自动生成的方法存根
		List s= list.getSelectedValuesList();
		String a="";
		for(int i=0;i<s.size();i++)
			a=a+" "+(String)s.get(i);
		label.setText(a);
	}});

}
}