检测实现接口的对象的类

Question

我正在编写一个游戏，作为该游戏玩家的一部分，他们应该能够单击各种GUI项目，并在GUI的特定区域查看更多详细信息。 我正在通过接口Detailable来实现此目的，该接口由适当的游戏对象实现，并将适当的信息发送到JPanel

还有一些容器（所有这些容器都实现Detailable ），其中包含其他对象（ Detailable实现）。 目标是可以单击一个容器，并在其统计信息中查看其内容，然后可以依次单击其内容以查看其统计信息，等等。

我遇到的问题是在编写容器的addToContents(Detailable d)方法。 每个容器都为容器“类型”的ArrayList<String> -衣柜，书柜等。我希望能够仅将某些类添加到给定容器-因此具有“书柜”类型的容器将只接受例如Book或Curio类的对象。

我目前拥有的是：

public boolean addToContents(Detailable d){
        if(this.types.contains("bookcase") && d.getClass().getName().equals("Book")){
            //do some stuff
            //I know "Book" isn't the right syntax, this is just to demo
            return true;
        }
        else if(this.types.contains("bookcase") && d.getClass().getName().equals("Curio")){
            //other stuff
            return true;
        }
        //etc
        else{
             return false;
        }
    }

但这感觉是错误的方法。 有没有更好的办法？ 理想情况下，出于简单代码的考虑，我会有类似（伪代码）的信息

Constructor:
private ArrayList<Class> classesAccepted = <list of classes>

addToContents:
if (classesAccepted.contains(d.getClass()){
    add the thingie to contents
    return true
}
else{
     return false;
}

但是我似乎找不到一种向构造函数添加类列表的方法-将类名称的ArrayList转换为对实际类的引用的ArrayList。

---

当前，容器是从JSON读取的，因此包含两个类：

public class FurnitureType {
    private String name;
    private List<String> type;
    private int cost;
    private String description;
    private int comfortBonus;
    private int capacity;
    //plus getters for all the above
}

public class Furniture implements Detailable, ListSelectionListener{

private String name;
private List<String> types;
private int cost;
private String description;
private int comfortBonus;
private int capacity;
private ArrayList<Detailable> contents;
private transient DetailPanel dp = null;

public Furniture (FurnitureType type){
    this.name=type.getName();
    this.types = type.getType();
    this.cost = type.getCost();
    this.description = type.getDescription();
    this.comfortBonus = type.getComfortBonus();
    this.capacity = type.getCapacity();
    this.contents = new ArrayList();
}
//appropriate getters

public boolean addToContents(Detailable d){
        if(this.types.contains("bookcase") && d.getClass().getName().equals("Book")){
            //do some stuff
            //I know "Book" isn't the right syntax, this is just to demo
            return true;
        }
        else if(this.types.contains("bookcase") && d.getClass().getName().equals("Curio")){
            //other stuff
            return true;
        }
        //etc
        else{
             return false;
        }
    }
@Override
public String toString(){
    return description;
}

@Override
public Icon getBigPic() {
    return null;
}

@Override
public JComponent getStats() {
    Object [] objectContents = contents.toArray();
    JList contentList = new JList(objectContents);
    contentList.setPreferredSize(new Dimension (400, 300));
    contentList.setFixedCellHeight(50);
    contentList.addListSelectionListener(this);
    contentList.setCellRenderer(new CustomCellRenderer());
    //the CustomCellRenderer class simply makes long descriptions into multiline cells
    return contentList;
}

@Override
public void addPanel(DetailPanel dp) {
    this.dp = dp;
}

@Override
public void valueChanged(ListSelectionEvent lse) {
    Detailable d = contents.get(lse.getFirstIndex());
    dp.updatePanel(d);
}

Answer 1

实际上，您可以使用Map ，如下所示：

private static Map<String, List<Class<? extends Detailable>>>
       bookcaseContainer = new HashMap<>();

 static {
       //load the bookcaseContainer Map from properties/database
         bookcaseContainer.put("bookcase", list1);
         bookcaseContainer.put("wardrobe", list2);
    }


if(bookcaseContainer.get("bookcase") != null && 
        bookcaseContainer.get("bookcase").contains(d.getClass())) {
        //do something here
 } else if(bookcaseContainer.get("wardrobe") != null && 
        bookcaseContainer.get("wardrobe").contains(d.getClass())) {
        //do something here
 }  

Answer 2

如果我正确理解了您的问题，那么您正在寻找这样的东西

ArrayList <Class<? extends Detailable>> acceptedClasses = new ArrayList<>();

acceptedClasses.add(Bookcase.class);
acceptedClasses.add(OtherAcceptable.class);

然后做一些类似于

boolean test = 
    acceptedClasses.stream().anyMatch(clazz -> aClass.isInstance(detailableInstance));

检查实例是否为可接受的类型