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//Title of this code
//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_45

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

class Rextester
{  
    public static void main(String args[])
    {
     int prod = -1; 
     boolean ans = false;    
     int bigPalin = -1; 
        
        
        for(int i=100; i<1000; i++) { 
            for(int n =100; i<1000; i++) {
                prod = i*n; 
                ans = isPalin(prod); 
                
                if(ans == true) {
                    if (prod > bigPalin) {
                     bigPalin = prod;    
                    }
                }
            }
        }
        System.out.println(bigPalin); 
        
        //System.out.println(isPalin(900010009));
        
    }
    
    public static boolean isPalin(int num) { 
       
       String numstr = ""+num; 
       String temp1 = "";
       String temp2 = ""; 
       boolean ans = true;  
       int numlen = numstr.length(); 
       //System.out.println("Diag 1. num: "+num+", numstr: "+numstr+", temp1: "+temp1+", temp2: "+temp2+", ans: "+ans+", numlen: "+numlen);
        
        
        for(int i=0; i<numstr.length()/2; i++) { 
            
            temp1 = numstr.substring(i, i+1); 
            temp2 = numstr.substring(numlen-1-i, numlen-i); 
            
            if(!(temp1.equals(temp2))) { ans = false; } 
           // else { } 
            //System.out.println("Loop #"+i+", temp1: "+temp1+", temp2: "+temp2);
            
        }
        
        //System.out.println("Diag 2. temp1: "+temp1+", temp2: "+temp2+", ans: "+ans);
        return ans;
        
        
        
    }
}

[ + ] Show input
Compilation time: 0.84 sec, absolute running time: 0.25 sec, cpu time: 0.12 sec, memory peak: 30 Mb, absolute service time: 1.12 sec