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Query regarding implmentation of writeXXX operations in DataOutPutStream

 
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I am getting familiar serialization API's in JDK. I have a simple question regarding implementation of java.io.DataOutPutStream writeXXX operations.

Here is the implementation for this API


Why there is a bitwise & with 0xFF ?

Edit : out.write will only write a byte and bitwise & with 0xFF will return a byte
 
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