JDK中用到的设计模式

java.io 中用到了装饰模式和适配器模式

  • 装饰模式， In general, each read request made of a Reader causes a corresponding read request to be made of the underlying character or byte stream. It is therefore advisable to wrap a BufferedReader around any Reader whose read() operations may be costly, such as FileReaders and InputStreamReaders.

  

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BufferedReader in = new BufferedReader(new FileReader("foo.in"));
  • 适配器模式, An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and decodes them into characters using a specified charset.
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InputStreamReader(InputStream in, String charsetName)           

Create an InputStreamReader that uses the default charset.  

观察者模式

Observer和Observable Listener  

工厂模式

Service Provider

模板方法

  • Integer.valueOf
  • Class.forName

责任链模式

filter