program java mengecek kata palindrom ( tanpa stack )

package javaapplication7;

import java.util.Scanner;

public class JavaApplication7 {

 public static void main (String[] args) {

   Scanner input = new Scanner(System.in);

String a;

int d=0;

int f=0;

System.out.print("Masukkan kata : ");

        a = input.next();

for (int i = a.length(); i >0 ; i--) {

String c = a.substring(i-1, i);

d=d+1;

String e = a.substring(d-1, d);

if(c.equals(e))

{

f+=1;

}

}

if(f==a.length()){

System.out.println("Kata "+a+" merupakan Palindrome");}

else{

System.out.println("Kata "+a+" bukan Palindrome");}

}

  }

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