Array size in Java

What would be the memory size/space 开发者_Go百科occupied in bits/bytes by array as follows.

final String[] objects_user1={"1","10","100","1000","10000"};

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ROUGH ESTIMATE: 12 bytes for array header, 4x5 bytes for the pointers (8x5 if you're on a 64 bit jvm), each string has 3 ints (+3x4 bytes), and an array of chars (+12 bytes for header + length of the string x2, because it's char).

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Did you try to Google it? Here is the first result of my Google search.

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Impossible to say, since its an implementation detail of the JRE you're using.

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You can get an approximate answer by querying available heap space before & after the memory allocation. Run it a number of times & compute the average, & it will be pretty close to the right answer. But again, the answer is only valid for the specific JVM it's run on.