Question

我正在努力为我的项目找出这个问题。我目前有一个Food类，用getter和setter以及toString存储名称，价格和描述。还有一个带有子类的课程（入门，主要甜点）。我想弄清楚如何将食物附加到课程中。

public abstract class Course{
    //fields
    //protected only accessible to subclasses
    protected MenuList starter;
    protected MenuList main;
    protected MenuList dessert;
    protected MenuList drinks;

    //Constructor
    public Course(){
    starter = new MenuList();

        main = new MenuList();

        dessert = new MenuList();

        drinks = new MenuList();    
    }
    //getters and setters

    //methods
    public abstract MenuList getList();

    //add item
    public void addItem(String course, String foodName, double price, String description, int calories){
        this.addItem(course, foodName, price, description, calories);
    }   
}

启动子类与main和dessert子类相同

public class StarterFood extends Course{
        //fields

    //constructor
    public StarterFood(){
        //course, 
        starter.addItem("starter", "chicken wings", 2.30, "very nice", 150, false);

    }

    @Override
    public MenuList getList() {
        return starter;
    }
    //Constructors


    //getters and setters

    //methods
}

到目前为止：添加食物（名称，价格，描述，卡路里）列出所有食品添加课程搜索课程（按课程编号或名称）列出所有课程我只需要做到这一点，但我很挣扎，任何帮助都会受到赞赏将食物附加到课程

Answer 1

如果您尝试将食物添加到课程中，则应使用“有”关系，例如：

public class Course {
    private Food food;

    public Course(Food food) {
        this.food = food;
    }

    public Course() {

    }

    public Food getFood() {
        return this.food;
    }

    public void setFood(Food food) {
        this.food = food;
    }
}

我也不会使用StarterFood扩展课程，因为扩展用于和“是”关系，我称之为StarterCourse然后添加默认值在构造函数中用于该课程的食物。

public class StarterCourse extends Course {

    public StarterCourse(Food food) {
        // here call the super classes constructor
        // add items via the Course constructor
        super(food);
    }
}

然后在你的主要课程中测试它，试试这个：

public class Main() {
    public static void main() {
        // First create new Food object
        Food food = new Food(); 
        // Create a new StarterCourse and add the Food object to it
        StarterCourse starterCourse = new StarterCourse(food);
    }
}

Java - 项目，向类添加对象

1 个答案: