Java program to print the prime numbers

java program to find prime numbers from 1 to n

  import java.util.Scanner;

  public class PrimeNum {

    public static void main(String[] args) {
       Scanner sc=new Scanner(System.in);
       System.out.println("Enter your limit : ");
       int limit=sc.nextInt();
       for (int i = 1; i < limit; i++) {
          boolean k = true;
          for (int j = 2; j <= i/2; j++) {
             if (i % j == 0) {
               k = false;
               break;
             }
         }
         if (k) {
           System.out.println(i);
         }
       }
    }

  }

Java program to check a number weather is it prime or not

import java.util.Scanner;

 public class PrimeCheck{
    public static void main(String args[]) {
       Scanner sc = new Scanner(System.in);
       System.out.println("Enter the number : ");
       int n = sc.nextInt();
       int flag = 0;

       for (int i = 2; i <= n / 2; i++) {
          if (n % i == 0) {
            System.out.println("Number is not prime");
            flag = 1;
            break;
          }
       }
       if (flag == 0)
         System.out.println("Number is prime");
    }
 }