Collections集合排序

import java.util.ArrayList;
import java.util.Collections;

public class ListSort {
	public static void main(String[] args) {
		ArrayList<Integer> 	list = new ArrayList<Integer>();
		list.add(new Integer(5));
		list.add(new Integer(3));
		list.add(new Integer(2));
		list.add(new Integer(4));
		list.add(new Integer(1));
		
		System.out.println("没有排序的时候："+list);
		
		Collections.sort(list);
		System.out.println("Collections.sort(list)=" + list );
		Collections.reverse(list);
		System.out.println("Collections.reverse(list)=" + list );
	}
}