Java输入100以内素数

public class PrimeNumberDemo {

public static void main(String[] args) {

for (int i = 1; i <= 100; i++) {

if (checkPrimeNumber(i)) {

System.out.print(i + ",");

}

}

 

}

 

public static boolean checkPrimeNumber(int num) {

int sum = 0;

for (int i = 1; i <= num; i++) {

if (num % i == 0) {

sum++;

}

}

if (sum == 2) {

return true;

}

return false;

 

}

}