Program to check Sting Palindrome:

import java.util.*;
public class CheckPalindrome{
    public static void main(String[]args){
    Scanner input=new Scanner(System.in);
    System.out.print("Enter String: ");
    String st=input.next();
    String str[]=st.split("");
    String reversedSt="";
    for(int i=str.length-1;i>=0;i--){
        reversedSt+=str[i];
    }
    if(st.equalsIgnoreCase(reversedSt)){
    System.out.println("String is palindrome");
    }
    else{
        System.out.println("String is not palindrome");
      }
    }
}

Program to check Number Palindrome:

import java.util.*;

public class NumberPalindrome {
    public static void main(String[] args) {
        try {
            Scanner input = new Scanner(System.in);
            System.out.print("Enter number: ");
            int num = input.nextInt();
            int n = num;
            int reversedNumber = 0;
            for (int i = 0; i <= num; i++) {
                int r = num % 10;
                num = num / 10;
                reversedNumber = reversedNumber * 10 + r;
                i = 0;
            }
            if (n == reversedNumber) {
                System.out.print("Number is palindrome!");
            } else {
                System.out.println("Number is not palindrome!");
            }
        } catch (Exception e) {
            System.out.println(e);
        }
    }
}