part6

package com.epam.rd.java.basic.practice1;

public class Part6 {

    private static void fillBooleanArray(boolean[] array, boolean value) {
        for (int i = 0; i < array.length; i++) {
            array[i] = value;
        }
    }

    private static void printPrimeNumbers(boolean[] prime) {
        String space = "";
        for (int i = 2; i < prime.length; i++) {
            if (prime[i]) {
                System.out.print(space + i);
                space = " ";
            }
        }
    }

    private static void sieveOfEratosthenes(int n) {
        boolean[] prime = new boolean[n + 1];
        fillBooleanArray(prime, true);
        for (int p = 2; p * p <= n; p++) {
            if (prime[p]) {
                for (int i = p * 2; i <= n; i += p) {
                    prime[i] = false;
                }
            }
        }

        printPrimeNumbers(prime);
    }

    public static void main(String[] args) {
        sieveOfEratosthenes(30);
    }
}