Java集合复习--ArrayList

import java.util.*;
public class matrixReshape {


    public static void  main(String[] args){
        Scanner sc = new Scanner(System.in);
        ArrayList arrayList = new ArrayList();
        while(sc.hasNextInt())
        {
            arrayList.add(sc.nextInt());
        }
        arrayList.sort(com.reversed());//倒序输出
        System.out.println(arrayList);
    }    
    public static final Comparator<Integer> com = new Comparator<Integer>()//定义Comparator借口
    {
        public int compare(Integer a,Integer b)
        {
                return a.compareTo(b);
        }
    };


}