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Does flush method for OutputStream do nothing?

From OutputStream.flush() docs.

Why does the document state that the flush OutputStream method OutputStream nothing after explaining that it really does something? Very confusing.

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3 answers

OutputStream is an abstract class that must be received. If necessary, subclasses will provide their own implementation. Otherwise, the default behavior is to do nothing.

eg. see code ObjectOutputStream.flush ()

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OutputStream is an abstract class. An output instance should override this if it needs a flash. For example, BufferedOutputStream .
Threads that do not have a buffer may not need to override flush() .

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The first part of the text describes the general flush contract. Classes that extend OutputStream are expected to adhere to this contract.

OutputStream is an abstract class, but a default flush implementation is provided. As described, the implementation does nothing.

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