memory allocation for upcasting in java

霸气de小男生 提交于 2019-12-05 22:30:40

Animal a = d;

a is just a reference and the reference's memory is allocated in method stack(or jvm stack, not heap).

That is when invoke the method main, JVM will allocate a stack which contains the reference's space.

The Actual object or its memory footprint is not affected. just a new reference to the object is created. The only difference is that the reference a can only call methods or access attributes that was available in the Super Class Animal.

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