Java – List the Starting N Prime Numbers

Write a Java program to list first N prime numbers. Where N is a number input by the user.

import java.util.Scanner;

public class NPrimeNumbers {
    private static Scanner scanner = new Scanner( System.in );

    public static void main(String[] args) {

        System.out.println("Enter total required prime numbers: ");

        String input = scanner.nextLine();
        int totalNumber = Integer.parseInt( input );
        int count = 0;

        System.out.println("A List of the first " + totalNumber + " prime numbers");

        for (int num = 2; count < totalNumber; num++)
        {

            boolean isPrime = true;
            for (int i=2; i <= num/2; i++)
            {
                if ( num % i == 0)
                {
                    isPrime = false;
                    break;
                }
            }

            if ( isPrime == true )
            {
                System.out.println(num);
                count++;
            }
        }
    }
}

import java.util.Scanner;

public class NPrimeNumbers {

private static Scanner scanner = new Scanner( System.in );

public static void main(String[] args) {

System.out.println("Enter total required prime numbers: ");

String input = scanner.nextLine();

int totalNumber = Integer.parseInt( input );

int count = 0;

System.out.println("A List of the first " + totalNumber + " prime numbers");

for (int num = 2; count < totalNumber; num++)

{

boolean isPrime = true;

for (int i=2; i <= num/2; i++)

{

if ( num % i == 0)

{

isPrime = false;

break;

}

if ( isPrime == true )

{

System.out.println(num);

count++;

}

Compile and run the program

javac NPrimeNumbers.java
java NPrimeNumbers

Output:

Enter total required prime numbers:
5
A List of the first 5 prime numbers
2
3
5
7
11