实习面试概念性问题准备

an object is a package of state and behavior.

Instanceof breaks abstractions and encapsulation. You should use polymorphism instead. 

Static type: how is a variable declared

dynamic type: what type has the object in memory when executing the program.

unchecked exception indicates an error which is highly unlikely and typically unrecoverable

checked exception indicates an error that every caller should be aware of and explicitly decide to handle or pass on.

virtual function 为啥用?

pointer

Overload vs. override

array vs linked list