Java Program to Check a Number is Palindrome or not

Java Program to Check a Number is Palindrome or not using while loop

In java programming, this program is used to accept a number as user input and checks whether number is palindrome or not.

Number is palindrome number if number and reverse of the number looks equal, otherwise not palindrome number.

import java.io.*;

public class Palindrome {
	public static boolean checkPolindrome(int number){
		int num = 0, digit, revNumber=0;
		num = number;
		while (num != 0){
			digit = num % 10;
			revNumber = (revNumber * 10) + digit;
			num = num / 10;
		}
		if (number == revNumber){
			return true;
		}
		return false;
	}
	public static void main(String[] args){
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int number;
		System.out.println("Check Polindrome or not");
		System.out.println("---------------------");
		System.out.print("Enter Number: ");
		try{
			number = Integer.parseInt(br.readLine());
			if (checkPolindrome(number)){
				System.out.println("Number '"+number+"' is Palindrome!");
			} else {
				System.out.println("Number '"+number+"' is not Palindrome!");
			}
		} catch(IOException ioe){
			System.out.println("Exception: "+ioe);
		}
	}
}

D:\Java_Programs>javac Palindrome.java
D:\Java_Programs>java Palindrome 
Check Polindrome or not
---------------------
Enter Number: 101
Number '101' is Palindrome!

D:\Java_Programs>javac Palindrome.java
D:\Java_Programs>java Palindrome 
Check Polindrome or not
---------------------
Enter Number: 123
Number '123' is not Palindrome!

Java Program to Check a Number is Palindrome or not using do while loop

import java.io.*;

public class Palindrome {
	public static boolean checkPolindrome(int number){
		int num = 0, digit, revNumber=0;
		num = number;
		do {
			digit = num % 10;
			revNumber = (revNumber * 10) + digit;
			num = num / 10;
		} while (num != 0);
		if (number == revNumber){
			return true;
		}
		return false;
	}
	public static void main(String[] args){
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int number;
		System.out.println("Check Polindrome or not");
		System.out.println("---------------------");
		System.out.print("Enter Number: ");
		try{
			number = Integer.parseInt(br.readLine());
			if (checkPolindrome(number)){
				System.out.println("Number '"+number+"' is Palindrome!");
			} else {
				System.out.println("Number '"+number+"' is not Palindrome!");
			}
		} catch(IOException ioe){
			System.out.println("Exception: "+ioe);
		}
	}
}

Java Program to Check a Number is Palindrome or not using for loop

import java.io.*;

public class Palindrome {
	public static boolean checkPolindrome(int number){
		int num = 0, digit, revNumber=0;
		num = number;
		for (num=number; (num != 0) ; num=num/10){
			digit = num % 10;
			revNumber = (revNumber * 10) + digit;
		}
		if (number == revNumber){
			return true;
		}
		return false;
	}
	public static void main(String[] args){
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int number;
		System.out.println("Check Polindrome or not");
		System.out.println("---------------------");
		System.out.print("Enter Number: ");
		try{
			number = Integer.parseInt(br.readLine());
			if (checkPolindrome(number)){
				System.out.println("Number '"+number+"' is Palindrome!");
			} else {
				System.out.println("Number '"+number+"' is not Palindrome!");
			}
		} catch(IOException ioe){
			System.out.println("Exception: "+ioe);
		}
	}
}