Uber电面【一亩三分地论坛面经版】 - Powered by Discuz!


Uber电面【一亩三分地论坛面经版】 - Powered by Discuz!
设计一个EventListener要求实现register unregister 和 post 方法

就是一个HashMap<String, List<Event>>然后函数是这样的
. From 1point 3acres bbs
public void register(String eventName, Event event) {};
public void unregister(String eventName, Event event){};
public void postEvent(String eventName, Object Data){};

public class Event {
  public void doEvent(Object data);. 1point3acres.com/bbs
}

就用HashMap去做就好了 很简单的。


为啥感觉一般都是在 Object 下注册 listener 呢,比如 android 里面的一个 button,可以注册 setOnClickListener 事件,button 被 click 之后,就会呼叫 clickListener,触发相应的注册事件。
class Button{. 
  Map<String, List<Listener>> listenerMap;

  clicked(){
    for(Listener listener : listenerMap.get("click")){
        listener.clicked();
    }
  }

}. 
所以是在 Object 下记录 listener, 而非在 listener 下记录 event 事件
import java.io.*;. 鐗涗汉浜戦泦,涓€浜╀笁鍒嗗湴
import java.util.*;

class Solution {
  public static void main(String[] args) {
  }
}

class EventListener {
  private Map<String, List<Event>> map;
  
  public EventListener() {
    map = new HashMap<String, List<Event>>();
  }
  
  public void register(String eventName, Event event) {. 1point3acres.com/bbs
    if (map.containsKey(eventName)) {
      map.get(eventName).add(event);
    } else {
      List<Event> events = new ArrayList<Event>();
      events.add(event);
      map.put(eventName, events);
    }
  };
  . From 1point 3acres bbs
  public void unregister(String eventName, Event event) {
    if (map.containsKey(eventName)) {
      map.get(eventName).remove(event);
    } 
  };
  
  public void postEvent(String eventName, Object Data) {
    Event event = new Event();
    event.doEvent(Data);
    this.register(eventName, event);
  };
}

class Event {
  private Object data;
  
  public void doEvent(Object data) {
    this.data = data;
  };

}


差不多 要考虑输入的有效性 然后 post event 是指对所有该 event 的 listener 都 doEvent
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