(Thought Question:) Would it be possible to write a PointDoubler class for ImmutablePoint objects?

A good answer might be:

No—any such class could not gain access to the instance variables it needs to double.

End of Chapter

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Call by Value
Primitive Data Types
The called method can't change the caller's data.
Returning a value from a method.
Object reference parameters.
Changeable objects as parameters.
How call by value works with object references.

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