所以我已经编写了一个简单的程序，返回用户通过scanner类输入的数字的因子。但我需要这个程序只打印该数字的素数因子，但我不知道如何改变我的代码，以便能够做到这一点。谢谢您！
主要类别：

package factoring_integers;

import java.util.Scanner;
public class Factoring_Integers {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Enter an integer: ");
        int num = in.nextInt();
        FactorGenerator myFacGenerator = new FactorGenerator(num);
        while (myFacGenerator.hasMoreFactors()){

            System.out.println(myFacGenerator.nextFactor());
        }

    }

}

二等舱：

public class FactorGenerator {
     public FactorGenerator(int a) {
        number = a;
        factor = 2;

    }

    public int nextFactor() {
        return factor++;
    }
    private final int number; 
    private int factor;
    private boolean done;

    public boolean hasMoreFactors() {
        boolean hasMoreFactors = false;
        done = false;

        if (factor < number) {
            while (!done) {
                if (number % factor != 0) {
                    factor++;
                }

                else {
                    done = true;
                    hasMoreFactors = true;
                }
            }
        }
        return hasMoreFactors;

    }

}