71 lines
1.9 KiB
Markdown
71 lines
1.9 KiB
Markdown
## 1. 适配器（Adapter）
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### Intent
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把一个类接口转换成另一个用户需要的接口。
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<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/3d5b828e-5c4d-48d8-a440-281e4a8e1c92.png"/> </div><br>
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### Class Diagram
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<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/image-20201117020248795.png"/> </div><br>
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### Implementation
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鸭子（Duck）和火鸡（Turkey）拥有不同的叫声，Duck 的叫声调用 quack() 方法，而 Turkey 调用 gobble() 方法。
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要求将 Turkey 的 gobble() 方法适配成 Duck 的 quack() 方法，从而让火鸡冒充鸭子！
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```java
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public interface Duck {
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void quack();
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}
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```
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```java
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public interface Turkey {
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void gobble();
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}
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```
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```java
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public class WildTurkey implements Turkey {
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@Override
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public void gobble() {
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System.out.println("gobble!");
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}
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}
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```
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```java
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public class TurkeyAdapter implements Duck {
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Turkey turkey;
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public TurkeyAdapter(Turkey turkey) {
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this.turkey = turkey;
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}
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@Override
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public void quack() {
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turkey.gobble();
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}
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}
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```
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```java
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public class Client {
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public static void main(String[] args) {
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Turkey turkey = new WildTurkey();
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Duck duck = new TurkeyAdapter(turkey);
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duck.quack();
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}
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}
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```
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### JDK
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- [java.util.Arrays#asList()](http://docs.oracle.com/javase/8/docs/api/java/util/Arrays.html#asList%28T...%29)
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- [java.util.Collections#list()](https://docs.oracle.com/javase/8/docs/api/java/util/Collections.html#list-java.util.Enumeration-)
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- [java.util.Collections#enumeration()](https://docs.oracle.com/javase/8/docs/api/java/util/Collections.html#enumeration-java.util.Collection-)
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- [javax.xml.bind.annotation.adapters.XMLAdapter](http://docs.oracle.com/javase/8/docs/api/javax/xml/bind/annotation/adapters/XmlAdapter.html#marshal-BoundType-)
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