Palindrome in java

A word, phrase, number or sequence that reads the same backwards as forwards

String = reverse of a String

e.g MADAM, MOM, 01022010 etc.

Let’s see different ways how we can determine, if a word or string is palindrome or not in Java.

package trypkg;

public class Pallindrom {

	public static void main(String[] args) {
		String str = "madam", revStr = "";
		
		for(int i=str.length()-1; i>= 0; i--)
			revStr = revStr + str.charAt(i);
		if(revStr.equals(str))
			System.out.println(str + " is a palindrome");
		else
			System.out.println(str + " is not a palindrome");
		
		/*            ****Another way to find palindrome****
		 *if(str.equalsIgnoreCase(new StringBuilder(str).reverse().toString()))
		 *    System.out.println(str + " is a palindrome");
		 *else
		 *    System.out.println(str + " is not a palindrome");
		 */
	}
}

For integer entry:

public class Pallindrom {

	public static void main(String[] args) throws IOException {
                System.out.println("Enter a no. to verify palindrome");
		Scanner sc = new Scanner(System.in);
		int Num = sc.nextInt();
		
		int temp = Num;
		int revNum = 0;
		int Rem = 0;
		
		while(Num > 0){
			Rem = Num % 10;
			revNum = (revNum * 10) + Rem;
			Num = Num / 10;
		}
		
		if(temp == revNum){
			System.out.println(temp + " is a palindrome number");
		}
		else{
			System.out.println(temp + " is NOT a palindrome number");
		}
         }
}

Output:

Enter a no. to verify palindrome
151
151 is a palindrome number