Question

嗨，我在OOP上不是很好，很抱歉，如果有人问过同样的问题。现在我在从另一个对象中获取对象的属性时遇到问题，其中两个对象都属于一个对象

public abstract class GameClient (){  
protected ClientRegistry registry;  
..   
}


public class MarketClient extends GameClient {   
public Auctioneer auctioneer = null;  
public Specialist specialist;  
...  
((GenericDoubleAuctioneer) auctioneer).setRegistry((MarketRegistry) registry);
specialist = registry.addSpecialist(clientId);  
}


public class Specialist extends AccountHolder() {  
public Specialist(final String id) {
        this(id, null);  
...   
}


public interface Auctioneer extends QuoteProvider (){  
public MarketRegistry getRegistry();  
public List configuration  
...  }

  public class DailyAssessmentReport(){  
protected void calculateProfits() {  
final Specialist specialists[] = GameController.getInstance().getRegistry().getSpecialists();  
//later, I'll get the ID of each specialist from specialists[];  
...  
...  
public Map< specialistID, List, Score> Result;  
//this Map contains specialistID , auctioneer.configuration, score  
}

我想要做的是制作一个包含（MAPID，auctioneer.configuration，profit）的MAP。我的问题是如何从Auctioneer.configuration类访问/获取DailyAssessmentReport的值？

我非常感谢你的回答

Answer 1

您可以使用地图，例如一个HashMap为您的目的。请注意，地图从一个对象映射到另一个对象。它们不会从一个对象映射到另外两个对象，就像您在示例中尝试的那样。但是，您仍然可以通过将两个目标对象存储在公共容器对象（例如ArrayList或2元素数组）中，然后映射到容器对象来实现目标。例如：

HashMap<String, Object[]> specialistIdToContainerObjectMap = new HashMap<String, Object[]>();

// get two objects which should be looked up later through the map, based on specialist ID
Specialist specialist = ...;
Auctioneer auctioneer = ...;

// create container object to hold the two objects to which we want to map
Object[] containerObject = new Object[2];
containerObject[0] = specialist;
containerObject[1] = auctioneer;

// store the container object in the map
specialistIdToContainerObjectMap.put(specialist.getId(), containerObject);

然后，您可以稍后查找容器对象并从中提取两个引用的对象：

// get a specialist id from somewhere, e.g. by doing someSpecialist.getId()
String specialistId = ...;

// look up the container object from the map
Object[] containerObject = specialistIdToContainerObjectMap.get(specialistId);

// extract the specialist and the auctioneer from the container object
Specialist specialist = (Specialist) containerObject[0];
Auctioneer auctioneer = (Auctioneer) containerObject[1];

我希望这会对你有所帮助。如果没有，例如因为我误解了你的问题，请提供反馈意见，以便我们为您找到合适的解决方案。

从属于同一个类的另一个对象访问对象的属性

1 个答案: