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## 装饰模式：IO设计的核心思想
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在不影响原有对象的前提下，无侵入的给一个对象增一些额外的功能。
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new InputStreamReader( new FileInputStream(new File("d:/abc.txt")) ) ;
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装饰模式
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![1576461139194](IO.assets/1576461139194.png)
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装饰者：需要持有主题（被装饰者）的一个引用。
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![1576462471474](IO.assets/1576462471474.png)
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装饰主题接口
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```java
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package decorator;
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/*
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* Created by 颜群
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*/
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public interface Phone {
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void call();//基础功能
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}
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```
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装饰主题的基础功能
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```java
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package decorator;
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/*
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* Created by 颜群
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*/
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public class ConcretePhone implements Phone {
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@Override
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public void call() {
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System.out.println("打电话....");
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}
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}
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```
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装饰者抽象类
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```java
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package decorator;
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/*
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* Created by 颜群
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*/
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public abstract class SmartPhone implements Phone{
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private Phone phone ;//装饰者 持有 主题的一个引用
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public SmartPhone(){
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}
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public SmartPhone(Phone phone){
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this.phone = phone ;
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}
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//装饰者 包含 原主题已有的功能
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@Override
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public void call() {
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phone.call();
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}
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}
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```
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具体装饰者1
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```java
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package decorator;
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/*
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* Created by 颜群
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*/
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public class ConcreteSmarPhone1 extends SmartPhone{
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public ConcreteSmarPhone1(Phone phone){
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super(phone) ;
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}
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public void call(){
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super.call();
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//额外的新功能
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changeColor();
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}
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public void changeColor(){
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System.out.println("智能变色...");
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}
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}
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```
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具体装饰者2
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```java
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package decorator;
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/*
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* Created by 颜群
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*/
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public class ConcreteSmarPhone2 extends SmartPhone{
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public ConcreteSmarPhone2(Phone phone){
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super(phone) ;
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}
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public void call(){
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super.call();
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//额外的新功能
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changeSize();
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}
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public void changeSize(){
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System.out.println("智能改变尺寸...");
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}
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}
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```
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测试类
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```java
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package decorator;
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/*
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* Created by 颜群
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*/
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public class Test {
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public static void main(String[] args) {
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ConcretePhone phone = new ConcretePhone();
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//主题（被装饰者）
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phone.call();
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System.out.println("---");
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ConcreteSmarPhone1 phone1 = new ConcreteSmarPhone1( phone ) ;
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phone1.call();
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System.out.println("---");
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ConcreteSmarPhone2 phone2 = new ConcreteSmarPhone2( phone ) ;
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phone2.call();
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System.out.println("-------");
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SmartPhone smart = new ConcreteSmarPhone2(new ConcreteSmarPhone1( phone )) ;
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smart.call();
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}
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}
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```
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