查找一个数据字符串中重复的子串

import java.util.Scanner;


public class Main{

      public static void main(String[] args){
          Scanner scanner=new Scanner(System.in);
          String string=scanner.nextLine();
          for(int i=0;i<99;i++)
          {
              String str=String.format("%02d", i);
              System.out.println(str);
              int index1=string.indexOf(str);
              int index2=string.lastIndexOf(str);
              if(index2-index1>=2)
              {
                  System.out.println(1);
                  scanner.close();
                  return;
              }
          }
          System.out.println(0);
        scanner.close();
      }
      
}