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请问在java中都说IO复用对性能有很大的提高，实现IO复用的方法是什么？

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在java中都说IO复用对性能有很大的提高，实现IO复用的方法是什么？

Java复用、多态&接口

可以为每一个类都创建main（）方法，便于单元测试　　当创建一个导出类的对象时，该对象包含一个包装在导出类对象内部的基类对象，所以java会自动的在导出类的构造器中插入对基类构造器的调用（super），在构造过程中是从基类“向外”扩散。　　带参数的构造器：　　如果基类的构造器带有参数，如Super（...

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