Java Questions 17 - Class and Object Creation

1. What are 3 ways to access a method?
   Answer:
   1. Invoking a method declared in the same class.
   2. Invoking a method using a reference in the class.
   3. Invoking an inherited method.
2. What do the words 1) construct, 2) create, and 3) instantiate mean when used interchangeably?
   Answer:
   They all mean, "An object is built on the heap."
3. What is the value of a reference that has not had an object assigned to it?
   Answer:
   The value of the reference is Null.
4. How can you determine if a method or variable is static?
   Answer:
   If you see a method invoked ( or a variable accessed) without the dot operator (.) , it means the method or variable belongs to the class where you see that code.
5. What does the reference always refer to?
   Answer:
   The reference this always refers to the currently executing object.
6. Can a private member be inherited from a subclass?
   Answer:
   When a member is declared private, a subclass cannot inherit it.
7. Does a subclass know about the private methods in the superclass?
   Answer:
   A subclass is unaware of the private mtehods in the superclass.
8. Why is default access called package access?
   Answer:
   A default member may be accessed only if the class accessing the member belongs to the same package, whereas a protected member can be accessed (through inheritance) by a subclass even if the subclass is in a different package.
9. What differentiates default and protected behavior ?
   Answer:
   Default and protected behavior differ only when we talk about subclasses. If the protected keyword is used to define a member, any subclass of the class declaring the member can access it through inheritance.
10. How would you decribe default access?
    Answer:
    Default access does not allow a subclass to access a superclass member unless the subclass is in the same package as the superclass.