Scanner in = new Scanner(System.in);这句错误，求大神

package cn.campsg.java.experiment;
public class MainClass {
    public static void main(String[] args) {

        //获取用户输入的两个数值
        System.out.println("请输入用于计算的两个数值,数值间用空格间隔：");
        Scanner in = new Scanner(System.in);
        double num1 = in.nextDouble();
        double num2 = in.nextDouble();
        in.close();

        //调用加法函数
        System.out.println("和为：" + Utils.add(num1, num2));
        //调用减法函数
        System.out.println("差为：" + Utils.substract(num1, num2));
        //调用乘法函数
        System.out.println("积为：" + Utils.multiply(num1, num2));
        //调用除法函数
        double ret = Utils.division(num1, num2);
        if(ret < 0)
            System.out.println("分母不能为0");
        else
            System.out.println("商为：" + ret);
    }
}