[Tugas kelompok ke-2] Binus - Java Programming

TK2_BilanganPrima.java

package brata.com;

import java.util.Scanner;

public class TK2_BilanganPrima {
    public static void main(String[] args) {
        int choice;
        while (true) {
            System.out.println("\nMenu hari ini :\n");
            System.out.println("1. Penjumlahan bilangan prima");
            System.out.println("2. Jumlah bilangan prima");
            System.out.println("3. Exit");

            choice = inputIntegerWithValidation("\nMasukkan Pilihan Anda: ");
            switch (choice) {

                case 1:
                    BilanganPrima("penjumlahan");
                    break;

                case 2:
                    BilanganPrima("jumlah");
                    break;

                case 3:
                    System.exit(0);
                    break;

                default:
                    System.out.println("Pilihan Anda salah!");
                    break;
            }
        }
    }


    private static void BilanganPrima(String choice) {
        System.out.println("=============================================");
        int bil1 = inputIntegerWithValidation("Masukkan bilangan 1 : ");
        int bil2 = inputIntegerWithValidation("Masukkan bilangan 2 : ");
        System.out.println("=============================================");
        System.out.println("\nBilangan Prima antara " + bil1 + " dan " + bil2 + " adalah :");

        int jumlahPrima = 0;
        for (int i = bil1; i <= bil2; i++) {
            int bilPrima = 0;
            for (int j = 1; j <= i; j++) {
                if (i % j == 0)
                    bilPrima = bilPrima + 1;
            }
            if (bilPrima == 2) {
                System.out.print(i + " ");
                if (choice.equals("penjumlahan")) {
                    jumlahPrima = jumlahPrima + i;
                }else {
                    jumlahPrima++;
                }
            }
        }

        System.out.println("\nPenjumlahan Bilangan Prima " + jumlahPrima);

    }

    // TODO: Method input data integer dengan validasi
    private static Integer inputIntegerWithValidation(String strLabel) {
        Scanner sc = new Scanner(System.in);
        int value = 0;
        do {
            System.out.print(strLabel);
            if (sc.hasNextInt()) {
                value = sc.nextInt();
                return value;
            } else {
                System.out.print("Input salah, ");
                sc.next();
            }
        } while (value == 0);

        return value;
    }
}