client.java

来自「java与模式 一书的源码」· 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");

    }
}