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Subject.java
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53 lines (46 loc) · 967 Bytes
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package observer;
import java.util.ArrayList;
import java.util.List;
public class Subject implements ISubject {
/**
* 观察者列表
*/
private List<IObserver> list=new ArrayList<>();
/**
* 主体中心数据
*/
private String data;
public String getData() {
return data;
}
public void setData(String data) {
this.data = data;
}
/**
* 添加观察者
* @param observer
*/
@Override
public void register(IObserver observer) {
list.add(observer);
}
/**
* 移除观察者
* @param observer
*/
@Override
public void unregister(IObserver observer) {
if(list.contains(observer)) {
list.remove(observer);
}
}
/**
* 通知所有观察者
*/
@Override
public void notifyObservers() {
for(IObserver observer : list) {
observer.refresh(data);
}
}
}