Is there any sizeof-like method in Java?

Question

Is there any built-in method in Java to find the size of any datatype? Is there any way to find size?

Answer 1

The Java Native Access library is typically used for calling native shared libraries from Java. Within this library there exist methods for determining the size of Java objects:

The getNativeSize(Class cls) method and its overloads will provide the size for most classes.

Alternatively, if your classes inherit from JNA's Structure class the calculateSize(boolean force) method will be available.