写出一个素数以上最近的素数

import javax.rmi.CORBA.Util;
import java.util.Scanner;

public class KeTangLianXi {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        System.out.println("请输入一个数字");
        int num = s.nextInt();


        while (true){
            num = num+1;
            boolean b = isSuShu(num);
            if (b){
                System.out.println(num+"");
                break;
            }
        }

    }

    public static boolean isSuShu(int num) {
        for (int i = 2 ; i < num; i++){
            if (num % i ==0 ){
                return false;
            }
        }
        return true;
    }
}