使用工具获取对象大小

Question

I have an object which is a composite of several other objects. When i use the getObjectSize() method in the Instrumentation package, does it include the size of the composite objects also?

Answer 1

The API doc says:

The result may include some or all of the object's overhead, and thus is useful for comparison within an implementation but not between implementations. The estimate may change during a single invocation of the JVM.

Answer 2

No. The returned size reflects the size of that object - it includes the references that object holds, but not the size of the objects being referred to. (And, as others have noted, it's not guaranteed to actually be correct.)

Answer 3

getObjectSize(Object obj)返回指定对象（ obj ）消耗的存储空间...因此，您将获得要指定的大小。