import java.util.Scanner;/** * Created by Admin on 2017/3/25. */public class test01 {  public static boolean IsPrime(int n){        if (n<2) return false;        if (n==2) return true;        if (n>2)        for (int i=2;i<=(int)Math.sqrt(n);i++){            if (n%i==0) return false;        }        return true;   }    public static void main(String[] args) {        int n = 1;        Scanner scanner = new Scanner(System.in);        while (n !=-1) {            n=scanner.nextInt();            if (IsPrime(n)) System.out.println("质数");            else System.out.println("非质数");        }    }}

在静态地方调用的函数也应该是静态的