import java.util.Scanner;
public class PalindromeString {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("Enter a string: ");
String str = sc.nextLine();
sc.close();
String reverse = new StringBuilder(str).reverse().toString();
if (str.equals(reverse)) {
System.out.println("The string is a palindrome.");
} else {
System.out.println("The string is not a palindrome.");
}
}
}
Enter a string: 3553
The string is a palindrome.
Enter a string: abc
The string is not a palindrome.
Scanner
class. We then create a StringBuilder
object from the input string and use its reverse()
method to reverse the string. We convert the reversed string to a String
object using the toString()
method.equals()
method to check if the original string is equal to the reversed string. If they are equal, we print a message indicating that the string is a palindrome. Otherwise, we print a message indicating that the string is not a palindrome.import java.util.Scanner;
public class PalindromeNumber {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("Enter a number: ");
int num = sc.nextInt();
sc.close();
int originalNum = num;
int reverse = 0;
while (num != 0) {
int digit = num % 10;
reverse = reverse * 10 + digit;
num /= 10;
}
if (originalNum == reverse) {
System.out.println("The number is a palindrome.");
} else {
System.out.println("The number is not a palindrome.");
}
}
}
Enter a number: 3553
The number is a palindrome.
Scanner
class. We then store the original number in a variable called originalNum
. We also create a variable called reverse
and initialize it to 0.while
loop to reverse the number. In each iteration of the loop
, we extract the last digit of the number using the modulo operator %
, and add it to the reverse
variable. We then remove the last digit from the number using integer division /
.if
statement to check if the original number is equal to the reversed number. If they are equal, we print a message indicating that the number is a palindrome. Otherwise, we print a message indicating that the number is not a palindrome.