concretesubject.java

来自「java与模式 一书的源码」· Java 代码 · 共 14 行

package com.javapatterns.observer.variation;

public class ConcreteSubject extends Subject
{
    private String state;

    public void change(String newState)
    {
        state = newState;

        this.notifyObservers();
    }
}