Partition Palindrome (BackTracking) #131, Java

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//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_111

import java.util.*;
import java.lang.*;

class Rextester
{  
    public List<List<String>> partition(String s) {
       List<List<String>> list = new ArrayList<>();
       backtrack(list, new ArrayList<>(), s, 0);
       return list;
    }
    
    public void backtrack(List<List<String>> list, List<String> tempList, String s, int start){
       if(start == s.length())
          list.add(new ArrayList<>(tempList));
       else{
          for(int i = start; i < s.length(); i++){
             if(isPalindrome(s, start, i)){
                tempList.add(s.substring(start, i + 1));
                backtrack(list, tempList, s, i + 1);
                tempList.remove(tempList.size() - 1);
             }
          }
       }
    }
    
    public boolean isPalindrome(String s, int low, int high){
       while(low < high)
          if(s.charAt(low++) != s.charAt(high--)) return false;
       return true;
    } 
    public static void main(String args[])
    {
        System.out.println("Hello, World!");
        Rextester obj = new Rextester();
        List<List<String>> out = obj.partition("aab");
        System.out.println("Size :"+out.size());
        for(List<String> lst:out){
            for(String s:lst){
                System.out.print(s+" ");
            }
            System.out.println("-");
        }
    }
}

[ + ] Show input
Compilation time: 0.73 sec, absolute running time: 0.16 sec, cpu time: 0.13 sec, memory peak: 18 Mb, absolute service time: 0,89 sec