程序不能用JAVA编译

我们被分配了一项任务：

设计船舶、货船和邮轮等级时，要注意每一类的行为。演示具有Ship数组的程序中的类。将各种船舶、巡洋舰和货船分配给数组元素

货船和巡洋舰是船级的产物

请告诉我我的代码有什么问题。我的教授的评论：程序不会编译，因为您没有定义CruiseShip、CargoShip等类，但您正在程序中使用它们

我不明白他所说的程序不编译和类没有定义是什么意思

我非常感谢您的反馈

下面是我的代码：

ShipDriver.java

CruiseShip.java

CargoShip.java

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喂？船的级别在哪里？需要导入它

此处显示的代码非常完美且正在运行。 若所有编译错误都在同一个文件夹中，那个么就不可能出现任何编译错误

我试着编译你的代码，得到了结果。附上了相同的截图

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我认为你的代码很好，没有问题

您的代码可能工作不正常，因为打包没有正确完成。如果它们在同一个包或位置，那么就没有问题

 If you put them in the same location then they will work fine and it is guaranteed. At max it might be possible your professor is wrong.

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我检查了你的代码，它运行良好，似乎你的教授在课堂上遇到了一些问题，或者他在编译时没有提供所有的课程。定义类意味着创建类，因为您已经创建了名为CruiseShip和Cargoship的类。我不明白他说的不编译是什么意思，因为我相信我的程序正在运行。非常感谢您的评论。我将与我的教授交谈。公共类船舶{String Ship；int yearbuild；公共船舶{this.Ship=Ship；this.yearbuild=yearbuild；}公共船舶{返回船舶\n船舶名称：+Ship+\n建造：+yearbuild；}您需要将其导入另一个.java文件您的意思是我的Ship类不应位于单独的java文件中吗？@EdHeal他对所有类使用默认包，并且所有类都位于同一文件夹中，他不需要导入任何类。

public class Ship{
    String ship;
    int yearBuilt;

    public Ship(String ship, int yearBuilt){
        this.ship = ship;
        this.yearBuilt = yearBuilt;
    }

    public String toString(){
        return "SHIP\nShip Name: " + ship + 
                "\nBuilt: " + yearBuilt;
    }  
}

import java.text.DecimalFormat;

public class CruiseShip extends Ship{
    String category;
    int passengers;
    int cabins;
    int cabinsWithBalconies;
    int swimmingPools;
    int restaurants;

    CruiseShip(String category, String ship, int yearBuilt, int passengers, int cabins, int cabinsWithBalconies, 
            int swimmingPools, int restaurants){
        super(ship, yearBuilt);
        this.category = category;
        this.passengers = passengers;
        this.cabins = cabins;
        this.cabinsWithBalconies = cabinsWithBalconies;
        this.swimmingPools = swimmingPools;
        this.restaurants = restaurants;
    }

    public String toString(){
        DecimalFormat df = new DecimalFormat("#,###");
        return "\nCRUISE SHIP\nCategory: " + category +
                "\nShip Name: " + ship + 
                "\nBuilt: " + yearBuilt +
                "\nPassengers: " + df.format(passengers) + 
                "\nNumber of Cabins: " + cabins +
                "\nNumber of Swimming Pools: " + swimmingPools +
                "\nNumber of Restaurants: " + restaurants;
    }
}

import java.text.DecimalFormat;

public class CargoShip extends Ship{
    int length, beam, maxCapacity;

    CargoShip(String ship, int yearBuilt, int length, int beam, int maxCapacity){
        super(ship, yearBuilt);
        this.length = length;
        this.beam = beam;
        this.maxCapacity = maxCapacity;
    }

    public String toString(){
        DecimalFormat df = new DecimalFormat("#,###");
        return "\nCARGO SHIP\nShip Name: " + ship + 
                "\nBuilt: " + yearBuilt +
                "\nLength Overall (ft): " + df.format(length) +
                "\nBeam (ft): " + beam +
                "\nGross Tonnage: " + df.format(maxCapacity);
    }
}

/** OUTPUT

SHIP LIST

SHIP
Ship Name: Destroyer
Built: 1886

CRUISE SHIP
Category: Small
Ship Name: Arethusa
Built: 2007
Passengers: 50
Number of Cabins: 26
Number of Swimming Pools: 0
Number of Restaurants: 1

CARGO SHIP
Ship Name: Mærsk Mc-Kinney Møller
Built: 2013
Length Overall (ft): 1,306
Beam (ft): 190
Gross Tonnage: 174,500

*/

 If you put them in the same location then they will work fine and it is guaranteed. At max it might be possible your professor is wrong.