How is a Java object constructed?

If I create a class like:

public class Test{
       int id;
       String name;
}

Now, i开发者_运维问答f I have to use the class, we have to just create a instance of the class as

Test testObj = new Test();

I would like to know how the actual object is created in the system. (In core level, what will be the structure of the object.)

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This depends on the actual virtual machine (vendor, version). There's no detailed specification on how a VM should store the instance.

The Java virtual machine does not mandate any particular internal structure for objects.