Prime Number Generator Logic

Question

I am supposed to make a class PrimeNumberGenerator which has a method nextPrime that will print out all prime numbers up to a number the user input

Answer 1

Check out my code:

import java.util.Scanner;

public class c4 {

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

            System.out.println("Enter number");

            int num = sn.nextInt();

            if (num==1){
                System.out.println("Nor Prime Neither Composite");
            }
            for (int i=2;i