JavaIO之FilterInputStream FilterOutputStream（十一）
FilterInputStreamFilterOutputStream都是装饰器模式中的Decorator抽象装饰角色他们继承了各自的抽象构建InputStream 和OutputStream
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他们内部都包含了一个抽象构建
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FilterInputStreamFilterOutputStream既然作为抽象的装饰器角色存在
所以他们也不太可能有什么实质性的方法
FilterInputStream中的所有方法 都使用的是内部的in来转发调用
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FilterOutputStream也是一样，几乎所有的请求都是转发给了内部的out对象
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不过有一个特殊的地方
内部的三个参数版本的write 并没有调用out对象的三个参数的write
仍旧是调用一个参数的write
注释中有明确提示Subclasses of FilterOutputStream should provide a more efficient implementation of this method.
子类应该重写此方法以提供更好地实现
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