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.  

    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.

    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