java 打印素数

 public static void main(String args[]){

 for(int i=2; i<100; i++){

 int factor = 0;
 for(int j=1; j<(i+2)/2; j++){

 if((i%j)==0){

 factor++;
 }
 }
 if(factor < 2)
 System.out.println(i+" is a prime");

 }
 }