How to check if a string is a palindrome ?

How to check if a string is a palindrome ?

Program

import java.util.Scanner;
public class Main
{
    public static void main(String[] args) 
    {
        int flag=0,low,high;
        String s;
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter String :");
        s=sc.nextLine();
        low = 0;
        high = s.length() - 1;
        while (low < high) 
        {
            if (s.charAt(low) != s.charAt(high)) 
            {
                flag=1;
                break;
            }
            low++; 
            high--; 
        }
        if(flag==0)
        {
            System.out.println("is a palindrome");
        }
        else
        {
            System.out.println("not a palindrome");
        }	
    }
}

Enter String : sateesh
not a palindrome


Enter String :
radar
is a palindrome

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