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50 lines
908 B
50 lines
908 B
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观察者模式
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---
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#### 目录
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1. 思维导图
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2. 概述
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3. 具体实现
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4. 参考
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#### 思维导图
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#### 概述
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观察者模式定义了对象间一种一对多的依赖关系,使得每当一个对象改变状态,则所有依赖它的对象都会得到通知并自动更新。它的最重要作用就是解耦,将被观察者和观察者解耦,使得它们之间的依赖性更小。
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#### 具体实现
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首先定义一个观察者的接口:
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```java
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public interface Observer {
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void onUpdate();
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}
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```
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然后具体的观察者实现:
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```java
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public class Observer1 implements Observer {
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@Override
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public void onUpdate() {
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System.out.println("Observer1 收到通知!");
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}
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}
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```
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```java
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public class Observer2 implements Observer {
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@Override
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public void onUpdate() {
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System.out.println("Observer2 收到通知!");
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}
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}
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```
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#### 参考 |