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ReadLine
A method used to read a line of text from a buffer or stream, often associated with BufferedReader in Java.
Null
A special marker used in programming to indicate that a variable does not hold any valid data or object reference.
WriteUTF
A method in Java for writing a string to an output stream in a modified UTF-8 format.
Flush
To flush means to clear a buffer in computing, forcing any buffered but not yet written data to be written to its destination, such as a file or a network.
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