Writer.flush
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public abstract void flush() throws IOException
Description
Flush the stream. If the stream has saved any characters from the
various write() methods in a buffer, write them immediately to their
intended destination. Then, if that destination is another character or
byte stream, flush it. Thus one flush() invocation will flush all the
buffers in a chain of Writers and OutputStreams.
Exceptions
IOException
If an I/O error occurs