client.java

来自「这是学习java与设计模式一书时所必备的源代码。只有这样才能更加深刻的理解编程的」· Java 代码 · 共 21 行

package com.javapatterns.observer.variation;

public class Client
{
    private static ConcreteSubject subject;
    private static Observer observer;

    public static void main(String[] args)
    {
		subject = new ConcreteSubject();

        observer = new ConcreteObserver();

        subject.attach(observer);

        subject.change("new state");

    }
}