Question

我的问题是，您可以在房间类的实例化中设置房间参数，但是如何设置房间类的聚合特征的属性，例如墙属性和窗口属性？因为我宁愿不使用setter？还有另一种方式吗？

因为我可以实例化房间，然后我必须添加墙壁和窗户的实例？由于我可以实例化3个房间，每个房间有不同的窗户和墙壁尺寸？

  ROOM CLASS < AGGREGATED WALL ARRAY LIST < AGREGGATED WINDOWS ARRAY LIST

由于

Answer 1

<击> 是的，构造函数。 LIke

public class Room { private List<Window> windows = new ArrayList<Window>(); private List<Wall> walls = new ArrayList<Wall>(); private List<Door> doors = new ArrayList<Door>(); public Room(int windows, int walls, int doors){ for(int i=0; i < windows; i++) windows.add(new Window()); //similarly for walls and Doors :) } //getters }

<击> 评论中的更新：OP希望避免使用setter，事实证明Windows可能属于不同的类型。似乎这是对组合能力的某种测试，has-a。

我想你需要这个。 弄清楚！

注意：我已在此编辑器中编写此内容，出于概念上的理解目的，代码可能无法编译

//you see rooms have walls, and many. So constructor takes List of //windows and doors in each wall. So, a List of walls that has List // (mixed bag) of windows and doors in each wall -- some may have no //window/door, then 2nd list will be empty. public class Room { List<Wall> _walls = new ArrayList<Wall>(); public Room(List<List<Openable>> walls){ for(List<Openable> windowsOrDoors : walls){ this._walls.add(new Wall(windowsOrDoors)); } } } //wall can have many doors and/or windows. We pass out mixed // bag list here, constructor will figure out how to keep //them in separate lists public class Wall { List<Door> doors = new ArrayList<Door>(); List<Window> windows = new ArrayList<Window>(); public Wall(List<Openable> openables){ for(Openable windowsOrDoor : openables){ if(windowsOrDoor instanceOf Window) this.windows.add(windowsOrDoors); else this.doors.add(windowsOrDoors); } } } //Window class, simple class -- it is of type Openable public class Window implements Openable{ public Window(int w, int h){ //do something } } //Door class, simple class -- it is of type Openable public class Door implements Openable{ public Door(int w, int h){ //do something } } //Openable -- a common interface to Window and Door, you can use //abstract class here and have getHeight, getWidth and other common //methods. This just for the purpose that if you wanted to add another //Window/Door class like `ArchedDoor` which has a `radius` as well, //you will just write a `ArchedDoor implements Openable` and pass into //the Room/Wall constructor. Nothing will break. public interface Openable{}

Answer 2

我不确定我理解你，

但您可以将参数添加到房间的构造函数中，然后使用这些参数作为其构造函数的参数来启动房间的墙（您也可以向其构造函数添加参数）

你的构造函数看起来像这样：

public Room(WinSize[] windowsSizes, Color[] wallsColors){
    for(int i = 0 ; i < WinSize.length ; i++)
    {
        windows.add(new Window(windowsSizes[i]));
    }
}

（假设你有一些像WinSize等的课程。）

Answer 3

这个问题缺少一些上下文，但总的来说，我可以说是的，你不会为聚合的计算字段创建公共setter。

通常你有私有方法来更新计算字段，这些方法是从构造函数和/或公共字段的setter调用的（也就是说，每次修改公共字段时都会更新计算字段）。 / p>

设置聚合功能

3 个答案: