Mencari bilangan prima

Gimana nih, ada tugas tuk menampilkan bilangan prima….. Kok susah ya?

Susah, ga juga… Siapa yang bilang susah…… Gampang buanget kok.

Nih kukasih liat contohnya:

import javax.swing.JOptionPane;

import java.util.Scanner;

public class Prima {

public Prima(){

String numString;

int numInt;

int i;

int jum = 0;

System.out.print (“Masukkan Nilai (int): “);

numString = new Scanner(System.in).next();

numInt = Integer.parseInt(numString);

for (i=1; i <= numInt; i++) {

if (numInt % i == 0) {

jum = jum + 1;

}

}

if (jum == 0){

System.out.println (“\nBye2\n”);

System.exit(0);

}

else if (jum == 2 && numInt != 1) {

System.out.println (“\t” + numString + ” Bilangan prima”);

new tes();

}else {

System.out.println (“\t” + numString + ” Bukan bilangan prima”);

new tes();

}

}

public static void main(String[] args) {

new tes();

}

}