Write a Java (BlueJ) Program to Display all Prime Numbers upto Given Number using for loop

Program Input: import java.util.*; public class PrimeNumber { public static void main(String[] args) { Scanner scann...

Program Input:

import java.util.*;

public class PrimeNumber 
{
    public static void main(String[] args) 
    {
        Scanner scanner = new Scanner(System.in);

        System.out.println("Please enter a number: ");
        int num = scanner.nextInt();
        
        if ( num < 2 ) {
            System.out.println("\n There are no Prime Numbers available");
            System.exit(0);
        }
        System.out.printf("\n The Prime Numbers from 1 to %d are: \n 2", num);
        PrimeNumber primeNum = new PrimeNumber();

        for (int i = 3; i <= num; i++) {
            if ( primeNum.isPrime(i) ) {
                System.out.print(", " + i);
            }
        }
    }
    
    // Method to check whether the number is prime or not
    public boolean isPrime(int num) {
        if ( num < 2 ) return false;
        for (int i = 2; i <= Math.sqrt(num); i++) {
            if ( num % i == 0 ) {
                return false;
            }
        }
        return true;
    }
}

Program Output:

Please enter a number:

100

 The Prime Numbers from 1 to 100 are:
 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 
 61, 67, 71, 73, 79, 83, 89, 97