Java类文件在IntelliJ的project中运行，但不在project之外

我刚刚做了一个测验，我们应该用一些给定的标准创建一个医院类，然后在HospitalTester驱动程序类中实例化一个医院类……我完成了任务，IntelliJ没有太多问题，运行良好

然后我做了我经常做的事情，我将要提交的java文件从项目文件夹中复制出来，

HospitalTester.java

，然后自己提交（教授不希望我们提交项目，只提交单个java文件）

我以为我做完了，一切都很好，但令我恐惧的是，今天我收到一封电子邮件，说班上只有一个人得了100分。我去检查我提交的内容，当我运行它时，什么都没有发生

我所有的代码都在下面，当我将其作为一个项目打开并保存为“测验1”时，它工作得很好，但当我将其从项目文件夹的src文件夹中删除时，它不会运行

为什么会这样

import java.text.DecimalFormat;
import java.util.Scanner;

public class HospitalTester {

    public static void main(String[] args) {

        // Construct new hospital instance
        Hospital hospital = new Hospital(
                "Grey-Sloan Memorial",
                10,
                150000.79,
                2450896.50);


        // Asks for keyboard prompt for hospital information.
        hospital.setName();
        hospital.setNumberOfDoctors();
        hospital.setAvgDoctorSalary();
        hospital.setTotalGrossIncome();


        //Creates a new String variable to print toString() method out from
        String sys;
        sys = hospital.toString();
        System.out.print(sys);

        // Provides percent of doctor salary compared to Total Gross Income
        hospital.percentDoctors();
    }

}


class Hospital {
    String name;
    private int number_doctors;
    private double avg_salary_doctors;
    private double total_gross_income;


    // Hospital Constructor
    public Hospital(String name, int number_doctors, double avg_salary_doctors, double total_gross_income) {
        this.name = name;
        this.number_doctors = number_doctors;
        this.avg_salary_doctors = avg_salary_doctors;
        this.total_gross_income = total_gross_income;
    }

    // Get methods to return hospital name, number of doctors, avg doctor salary, and total gross income of hospital.
    public String getName() {
        return name;
    }

    public int getNumberOfDoctors() {
        return number_doctors;
    }

    public double getAvgDoctorSalary() {
        return avg_salary_doctors;
    }

    public double getTotalGrossIncome() {
        return total_gross_income;
    }

    //Set methods to change hospital name, number of doctors, avg doctor salary, and total income of hospital varaibles.

    public void setName() {
        System.out.print("Enter a new name for the hospital: \n");
        this.name = new Scanner(System.in).nextLine();
    }

    public void setNumberOfDoctors() {
        System.out.print("Enter the number of doctors working at the hospital: \n");
        this.number_doctors = new Scanner(System.in).nextInt();
    }

    public void setAvgDoctorSalary() {
        System.out.print("Enter the average doctor salary: \n");
        this.avg_salary_doctors = new Scanner(System.in).nextDouble();
    }

    public void setTotalGrossIncome() {
        System.out.print("Enter the total gross income that the hospital makes: \n");
        this.total_gross_income = new Scanner(System.in).nextDouble();
    }

    // Calculates total doctors salary: (Number of doctors * avg salary of doctor) / Total Gross Income
    public void percentDoctors() {
        double percent, percent_converted;
        String percent_converted_rounded;
        percent = (number_doctors * avg_salary_doctors) / total_gross_income;
        percent_converted = percent * 100;

        // Round off to two decimal places.
        DecimalFormat df = new DecimalFormat("#,###,##0.00");
        percent_converted_rounded = df.format(percent_converted);

        System.out.print("Doctor salary as a percent of total gross income = " + percent_converted_rounded + "% \n");


    }


    public String toString() {


        //Provide formatting to Doctor salary and hospital income financial numbers.
        DecimalFormat df = new DecimalFormat("#,###,##0.00");
        String hospital_income_format, avg_salary_doctors_format;
        hospital_income_format = df.format(total_gross_income);
        avg_salary_doctors_format = df.format(avg_salary_doctors);


        return "Name = " + name
                + "\nNumber of Doctors = " + number_doctors + " doctors " +
                "\nAverage Doctor Salary = $" + avg_salary_doctors_format +
                "\nHospital Income = $" + hospital_income_format + "\n";
    }

}

---

我只是复制了代码并使用javac命令运行它（将其保存为随机文件夹中的java文件），它对我来说很好。您是否尝试使用javac或IDE本身执行它？

我刚刚将您的代码复制到名为

HospitalTester.Java的Java文件中

我运行
javac HospitalTester.java

我运行java HospitalTester

扫描仪将启动：

Enter a new name for the hospital:

---

希望有帮助。

您不能运行.java类。您需要先编译它，得到一个.class文件，然后才能运行它。@Atizs我怎么能在项目中运行这样一个.java类呢？什么变化？如果您签入Intellij项目文件夹，您将看到类映射。当您执行“运行”时，Intellij首先编译写入.class文件的.java文件，然后执行它们。Project Folder/out/production这是类文件所在的位置，它没有给我一个在IDE中正常运行的选项（绿色箭头）。我尝试在IDE中使用终端，在IDE外部使用

javac HospitalTester.java

而不使用任何东西happened@EvanKim可能您不在“java项目上下文”中，我刚刚发布了一个屏幕截图。你收到错误信息了吗？如果您在windows上，请检查Java环境变量。哦，我没有意识到在

javac HospitalTester.Java

之后您必须输入第二个命令

Java HospitalTester

lololoh，您需要第二个命令来运行HospitalTester类lol。好的，谢谢，这很有意义。我希望我的老师知道这个lol