1 package first_1; 2 3 public class primeNumberTest2 { 4 public static void main(String[] args) { 5 6 7 int count = 0; 8 label:for (int i = 2; i < 100000; i++) { 9 for (int j = 2; j <= Math.sqrt(i); j++) { 10 if (i % j == 0) { 11 continue label; 12 } 13 14 } 15 count++; 16 17 } 18 System.out.println("质数的个数为:" + count); 19 20 } 21 }