Palindrome Program in Java

Palindrome number in java: A palindrome number is a number that is same after reverse. For example 545, 151, 34543, 343, 171, 48984 are the palindrome numbers. It can also be a string like LOL, MADAM etc.

Palindrome number algorithm

Get the number to check for palindrome
Hold the number in temporary variable
Reverse the number
Compare the temporary number with reversed number
If both numbers are same, print "palindrome number"
Else print "not palindrome number"

Let's see the palindrome program in java. In this java program, we will get a number variable and check whether number is palindrome or not.

class PalindromeExample{
 public static void main(String args[]){
  int r,sum=0,temp;  
  int n=454;//It is the number variable to be checked for palindrome

  temp=n;  
  while(n>0){  
   r=n%10;  //getting remainder
   sum=(sum*10)+r;  
   n=n/10;  
  }  
  if(temp==sum)  
   System.out.println("palindrome number ");  
  else  
   System.out.println("not palindrome");  
}
}

Output:

palindrome  number

Palindrome Program in Java (Another way)

You can also use a method where number or string is not predefined. Here, user has to put the number or string as input to check if the number/string is palindrome.

import java.util.*; 
class PalindromeExample2
{
   public static void main(String args[])
   {
      String original, reverse = ""; // Objects of String class
      Scanner in = new Scanner(System.in); 
      System.out.println("Enter a string/number to check if it is a palindrome");
      original = in.nextLine(); 
      int length = original.length(); 
      for ( int i = length - 1; i >= 0; i-- )
         reverse = reverse + original.charAt(i);
      if (original.equals(reverse))
         System.out.println("Entered string/number is a palindrome.");
      else
         System.out.println("Entered string/number isn't a palindrome."); 
   }
}

Output:

Use image PalindromeExample

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