Prime Number

Program -

import java.util.*;

public class Prime
{
    public static void main(String[] args)
    {
        int n = 49;
        boolean prime = true;
        for(int i = 2; i < n; i++)
        {
            if(n % i == 0)
            {
                prime = false;
                break;
            }
        }
        System.out.println(prime);
    }
   
}

Video explanation -

PALINDROME

Program code :

public class Palin
{
    public static void main(String[] args)
    {
        String x = "abcdrba";
        int i = 0, j = x.length() - 1;
        while(i < j)
        {
            if(x.charAt(i) != x.charAt(j))
            {
                System.out.println("Not palindrome ");
                System.exit(0);
            }
            i++;
            j--;
        }
        System.out.println("Palindrome");
    }
}

https://amzn.to/2ubVeZr

Video explanation: