Collections会合排序

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 );}}

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