计算质数

package test.com.ict.compent.amazom;

import java.util.ArrayList;
import java.util.List;

public class MathPrime {
    public static void main(String[] args) {
        List<Integer> add = new MathPrime().mathPrime(100);
        for (Integer integer : add) {
            System.out.print(integer+",");
        }
    }
    
    public List<Integer> mathPrime(int num){
        List<Integer> list=new ArrayList<Integer>(); 
        
        while(true){
            boolean a=false;
            Integer zhishu = zhishu(num);
            list.add(zhishu);
            if(zhishu==num){
                a=true;
            }else{
                num=num/zhishu;
            }
            if(a){
                break;
            }
        }
        
        return list;
    }
    
    public Integer zhishu(int num){
        int a=0;
        for (int i = 2; i < num; i++) {
            if(num%i!=0){
                continue;
            }else{
                a=i;
                break;
            }
        }
        if(a==0){
            a=num;
        }
        return a;
        
    }
    
}