java中求几个字符串的最大公共子串 使用了比较器Compa

package com.swift;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class Max_Substring_Test {

    public static void main(String[] args) {

        /*
         * 几个字符串的最大公共子字符串
         */

        String str1 = "eriousdfndnfdlk";
        String str2 = "dkgfdkgkdjgdjgjksjgksgjsdkjsdierioe";
        String str3 = "ldskfjdskierundsnfjerioejrejrheruer3j43j4hj3";
        String sub;
        
        List<String> list=new ArrayList<String>();

        for (int i = 0; i < str1.length(); i++) {
            sub = str1.substring(0, i);
            
            if(str2.indexOf(sub)!=-1&&str3.indexOf(sub)!=-1) {
//                System.out.println(sub);
                list.add(sub);
            }
        }
        
        Collections.sort(list, new Comparator<String>() {

            @Override
            public int compare(String arg0, String arg1) {
                int i=arg1.length()-arg0.length();
                return i;
            }
            
        });
        
            System.out.println("The max subString is "+list.get(0));
    }

}