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According to the Java API for the read(byte[] b, int off, int len) method:

An attempt is made to read as many as len bytes, but a smaller number may be read, possibly zero. 

Both read methods return as soon as they find available input data. As a result, these methods can stop reading data before the array is filled because the available data may be insufficient to fill the array.

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Incorrect use of the read() method can result in the wrong number of bytes being read or character sequences being interpreted incorrectly.

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