QUESTION 1

Object are just memory addresses and can be assigned to one another without regard to type.

True

False

2 points

QUESTION 2

If class D is derived from class B, we speak of D as the derived class and B as the base class.

True

False

2 points

QUESTION 3

A programmer must have the source code for packages to extend them, even using inheritance.

True

False

2 points

QUESTION 4

In Java, virtual functions definitions are implemented with a table look up that is done at run time from a base class object.

True

False

2 points

QUESTION 5

One can use the this object to access variables from the object that the method is a member of.

True

False

2 points

QUESTION 6

No objects can be defined of abstract base class type since it is an incomplete definition.

True

False

2 points

QUESTION 7

If B is a public base class of D, then Ds members cannot invoke public members functions of B.

True

False

3 points

QUESTION 8

If a class is named myClass, what must the constructor be named?

		Any name the programmer wishes except the name of the class
		None of the above
		myClass()
		private myClass()
		public myClass()

4 points

QUESTION 9

The first and last indexes in an array named ar are:

		0 and ar.length
		1 and ar.length
		0 and ar.length - 1
		1 and ar.length - 1

4 points

QUESTION 10

Suppose class Child is derived from class Parent that was in turn derived from class GrandParent. When we declare an object of class Child, three constructors are called: i) Child, ii) Parent, iii )GrandParent.. What is the order?

		GrandParent, Child, Parent
		GrandParent, Parent, Child
		Parent, GrandParent, Child
		Child, Parent, GrandParent
		GrandParent, Child, Parent

4 points

QUESTION 11

Template classes such as ArrayLists may be used to make available a very large collection of _____.

		basic data types
		files
		none of the above.
		programs
		objects

4 points

QUESTION 12

How many times is the following code invoked by the call call_me(4)?

public void call_me(int i){

if (i < 8){

System.out.print(i + " ");

call_me(i--);

}

}

		1
		2
		8
		128
		The int would be underflowed
		This is would cause an infinite loop

4 points

QUESTION 13

The ability to reuse objects already defined, with modification appropriate to the new purpose, is referred to as

		Information hiding
		Overloading
		Redefinition
		Inheritance

3 points

QUESTION 14

Consider the class inheritance.

class B{ private int b; B(){} B(int b){} public void f(){} public void g(){} } class D extends B{ public double d; D(int b, double d); public void h(); } 

Which of the following functions can be invoked by an object of class D?

		f()
		g()
		h()
		All of the above.
		None of the above