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[No Typing] Files: Creating Directories

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method creates a directory, returning true on success and false on failure.
creates both a directory and all the parents of the directory
to list down all the files and directories available in a directory
used in the context of DataOutputStream and can be used to read primitives.
sed to create a file and write data into it.
public void close() throws IOException{}
This method closes the file output stream. Releases any system resources associated with the file. Throws an IOException
public void write(byte[] w)
Writes w.length bytes from the mentioned byte array to the OutputStream.