打印N以内的素数

[java]代码库

import java.util.Scanner;
public class Main 
{
	public static void main(String[] args) 
	   {   
		   int flag1 = 0;
		   Scanner x = new Scanner(System.in);//构造一个SCANNER对象，其传入参数为SYSTEM.IN
    	   int n = x.nextInt();//读取一个INT数值
	       for ( int i = 2; i < n; i++)
	       {
	           int flag2 = 0;
	    	   for (int j = 2; j<=i/2; j++)
	           {
	        	   if(i%j==0)
	        	   {
	        		   flag2 = 1;
	        		   break;
	        	   }
	           }
	    	   if(flag2==0)
	           {
	               if(flag1==1)
	               {
	                   System.out.print(",");
	                   System.out.print(i);
	               } 
	               else
	               {
	                   System.out.print(i);
	                   flag1 = 1;
	               } 
	           }
	       }
	   }
}