How to calculate total number of bits in BitSet object?

问题

I want to calculate the total number of bits in a BitSet object. The method length returns the "logical size" of the BitSet: the index of the highest set bit in the BitSet plus one, while method cardinality will give the total number of bits set to 1 in the object.

I want to calculate the total number of bits including both 0s and 1s. How do I do that?

回答1:

How about BitSet.size()?.....

回答2:

The getObjectSize(Object o) method in the Instrumentation library is your guy: http://docs.oracle.com/javase/7/docs/api/java/lang/instrument/Instrumentation.html

There are a few threads on this.

• http://www.javaworld.com/article/2077496/testing-debugging/java-tip-130--do-you-know-your-data-size-.html
• In Java, what is the best way to determine the size of an object?

Cheers!

回答3:

The site shows how to convert a BitSet to binary String. Then just calculate the string.length()

来源：https://stackoverflow.com/questions/11062616/how-to-calculate-total-number-of-bits-in-bitset-object