[AppleScript] 纯文本查看 复制代码
public class Subject {
//保存注册的观察者对象
private List<Observer> mObervers = new ArrayList<>();
//注册观察者对象
public void attach(Observer observer) {
mObervers.add(observer);
Log.e("SZH", "attach an observer");
}
//注销观察者对象
public void detach(Observer observer) {
mObervers.remove(observer);
Log.e("SZH", "detach an observer");
}
//通知所有注册的观察者对象
public void notifyEveryOne(String newState) {
for (Observer observer : mObervers) {
observer.update(newState);
}
}
}
接着是一个具体的被观察者对象
public class ConcreteSubject extends Subject {
private String state;
public String getState() {
return state;
}
public void change(String newState) {
state = newState;
Log.e("SZH", "concreteSubject state:" + newState);
//状态发生改变，通知观察者
notifyEveryOne(newState);
}
}[AppleScript] 纯文本查看 复制代码
public class ObserverA implements Observer {
//观察者状态
private String observerState;
@Override
public void update(String newState) {
//更新观察者状态，让它与目标状态一致
observerState = newState;
Log.e("SZH", "接收到消息：" + newState + "；我是A模块，快来抢吧！！");
}
}
public class ObserverB implements Observer {
//观察者状态
private String observerState;
@Override
public void update(String newState) {
//更新观察者状态，让它与目标状态一致
observerState = newState;
Log.e("SZH", "接收到消息：" + newState + "；我是B模块，快来抢吧！！");
}
}
public class ObserverC implements Observer {
//观察者状态
private String observerState;
@Override
public void update(String newState) {
//更新观察者状态，让它与目标状态一致
observerState = newState;
Log.e("SZH", "接收到消息：" + newState + "；我是C模块，快来抢吧！！");
}
}