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Asked: 2026-05-20T20:24:01+00:00

Java DataInputStream class method readFully is used for reading the bytes from the stream

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Java DataInputStream class method readFully is used for reading the bytes from the stream into the to the byte array which is passed as the parameter. After reading the bytes from the stream, does readFully increment the position of the stream ?

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  1. Editorial Team

    After reading the bytes from the stream, does readFully increment the position of the stream ?

    Yes.

    I cannot see where this is explicitly stated in the DataInputStream javadocs, but that’s the way that all input streams and readers work.

    If DataInputStream.readFully() didn’t behave this way:

    • it would make the API hard to use,
    • it would be difficult and expensive to implement … since DataInputStream is a filter for an arbitrary InputStream instances and these don’t support seeking, and
    • it would violate the principle of least surprise.
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