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what is the purpose of marker interface

 
umesh rawat
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what is the purpose of marker interface
i know that serializable and clonable are marker interfaces .
but dont know why they have define them if noting is inside them.

Umesh rawat
Rmw 2019
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Ulf Dittmer
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This has been asked and answered exhaustively many, many times. Please use the "Search" link at the top of the page to find the previous discussions. Make sure you search through all forums, not just this one.
 
umesh rawat
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Thanks for this idea
 
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