統計1到n之間的素數

package com.program;

public class PrimeNumber { public static void main(String[] args) { print(100, 107); }

public static void print(int startNum, int endNum) {
	int count = 0;
	for (int i = startNum; i <= endNum; i++) {
		boolean b = false;
		for (int j = 2; j <= Math.sqrt(i); j++) {
			if (i % j == 0) {
				b = false;
				break;
			} else {
				b = true;
			}
		}
		if (b == true) {
			count++;
			System.out.println(i);
		}
	}
	System.out.println("prime number is : " + count);
}

}