向Java类添加方法是否会增加其实例的内存使用量？

Question

Adding member variables to a class certainly boosts the memory footprint of its instances on the heap, but what about a class's methods?

For example, if I have a class composed of a single StringBuilder, but keep adding dozens of methods to manipulate that StringBuilder, will each instance of that class take up proportionally more memory as I add more methods?

Thanks!

Answer 1

No, adding methods does not increase the footprint of the object, only the footprint of the compiled code. In other words, the per-instance memory cost is zero.

Answer 2

The short answer is no, it will not add more memory to each object living in the heap. The only thing that will happen is when the class is first loaded, it will also load this methods.

Answer 3

这是特定于VM的，但对于每个人使用的Oracle Hotspot VM，不，实例大小不受影响。