用自制比较器完成排序

import java.util.*;
public class Main{
    public static void main(String[] args)
    {
        Scanner in=new Scanner(System.in);
        String[] s=new String[3];
        s[0]="lol";
        s[1]="qwer";
        s[2]="ppppppp";
        Arrays.sort(s,new lengthcompare());
        System.out.println(Arrays.toString(s));
    }
}
class lengthcompare implements Comparator
    {
        public int compare(String a,String b)
        {
            return a.length()-b.length();
        }
    }