题解 | #判断素数个数#

不包含2的素数个数：

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int start = scanner.nextInt();
        int end = scanner.nextInt();
        method(start,end);

    }
    public static void method(int start,int end){
        int count=0;
        if(start > end) start = start+end-(end=start);
        int j;
        for(int i=start; i<=end; i++){
            if(i%2 == 0) continue;
            for(j=2; j<i; j++){
                if(i % j == 0) break;                                  
            }
            if(j == i) count++;
        }
        System.out.println(start+"到"+end+"之间有"+count+"个大于2的素数");

    }
}