real example of portability in java .

in this for a hardworker nothing is impossible , but he is failure in only one task ... aaahhh leave this ...
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come in topic , we all say that java is portable , but i want to ask a question that why java is portable can you give me real world example of portability . some of of surely give a correct answer but some of you know about portability but can not explain why in java . so for you help please read this .

please download this image for proper and solid understanding .