Java program to check palindrome

Palindrome number is a number which remains the same when reversed, for example, 121, 313, 525, etc.

Example

Let us now see an example to check palindrome −

public class Palindrome {
   public static void main(String[] args) {
      int a = 525, revVal = 0, remainder, val;
      val = a;
      System.out.println("Number to be checked = "+a);
      while( a != 0 ) {
         remainder = a % 10;
         revVal = revVal * 10 + remainder;
         a /= 10;
      }
      if (val == revVal)
         System.out.println("Palindrome!");
      else
         System.out.println("Not a palindrome!");
   }
}

Output

Number to be checked = 525
Palindrome!

Example

Let us now check for palindrome string such as “aba”, “wow”, etc −

public class Demo {
   public static void main (String[] args) {
      String str = "ABA";
      String strRev = new StringBuffer(str).reverse().toString();
      if (str.equals(strRev))
         System.out.println("Palindrome!");
      else
         System.out.println("Not a Palindrome!");
   }
}

Output

Palindrome!