# 5 Digit Integer Palindrome in Java

(Palindromes) A palindrome is a sequence of characters that reads the same backward as forward. For example, each of the following five-digit integers is a palindrome: 12321, 55555, 45554 and 11611. Write an application that reads in a five-digit integer and determines whether itâ€™s a palindrome. If the number is not five digits long, display an error message and allow the user to enter a new value.

## 5 Digit Integer Palindrome in Java

``````/*
*       Filename:  NumericalPalindrome.java
*
*    Description:  Exercise 4.30 - Palindromes
*
*  @Author:  Bilal Tahir Khan Meo
*  Website: https://www.codeblah.com
*
* =====================================================================================
*/
public class NumericalPalindrome{
// ensure number is of length 5
public boolean validate(int value){
return (Integer.toString(value).length() == 5);
}

public boolean isPalindrome(int value){
int arrValue[] = new int[5];

// split the int
// countdown so as to not reverse the original order
for(int i=4; i>=0; i--){
arrValue[i] = value % 10;
value /= 10;
}

return ((arrValue[0] == arrValue[4]) && (arrValue[1] == arrValue[3]));
}
}``````

NumericalPalindromeTest.java

``````/*
*       Filename:  NumericalPalindromeTest.java
*
*    Description:  4.30 - determine whether a 5 digit number is a palindrone
*
*  @Author:  Bilal Tahir Khan Meo
*  Website: https://www.codeblah.com
*
* =====================================================================================
*/
import java.util.Scanner;

public class NumericalPalindromeTest{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
NumericalPalindrome np = new NumericalPalindrome();

while(true){
System.out.print("Enter a 5 digit number to test: ");
int testCase = sc.nextInt();

if(np.validate(testCase)){
if(np.isPalindrome(testCase))
System.out.printf("%s is a palindrone.\n", testCase);
else
System.out.printf("%s is not a palindrone.\n", testCase);
break;
}
}
}
}``````