11.

The relationship between a child (sub) class and a parent (super) class is referred to as a(n) ____ relationship. (2 points)

	abstract
	has-a
	is-a
	polymorphism
	was-a

12.

The process of determining which method in a class hierarchy should execute is known as (2 points)

	is-a
	has-a
	inheritance
	parent class
	polymorphism

13.

Consider the following code: public class A1 { public int x; private int y; ... } public class A2 extends A1 { public int a; private int b; ... } public class A3 extends A2 { private int q; ... } Which of the following sets of instance variables are directly accessible in class A2? (2 points)

	a, b
	x, a, b
	x, y, a, b
	x, y, a, b, q
	y, a, b

14.

Consider the following code: public class A1 { public int x; private int y; ... } public class A2 extends A1 { public int a; private int b; ... } public class A3 extends A2 { private int q; ... } Which of the following is true regarding the use of instance variable y in class A1? (2 points)

	It is directly accessible only in A1
	It is directly accessible only in A3
	It is directly accessible in A1 and A2
	It is directly accessible in A1, A2, and A3
	It is not directly accessible in any of the three classes

15.

Consider the following code: public class B1 { private int i; private int j; ... } public class B2 extends B1 { private int m; private int n; ... } public class B3 extends B2 { private int z; ... } Which of the following sets of instance variables are directly accessible in class B3? (2 points)

	i, j, m, n
	i, j, m, n, z
	i, j, z
	m, n, z
	z

16.

Consider the following code: public class B1 { private int i; private int j; ... } public class B2 extends B1 { private int m; private int n; ... } public class B3 extends B2 { private int z; ... } Which of the following is true regarding the use of instance variable j in class B1? (2 points)

	It is directly accessible only in B1
	It is directly accessible only in B2
	It is directly accessible only in B3
	It is directly accessible in B1 and B2
	It is directly accessible in B1, B2, and B3

17.

The instruction super(); in a child class does which of the following? (2 points)

	Invokes the constructor as defined in the current class.
	Invokes the constructor as defined in the current class's parent class.
	Invokes the method super as defined in java.lang.ArrayList.
	Invokes the method super as defined in the current class.
	Invokes the method super as defined in the current class's parent class.

18.

All classes in Java are directly or indirectly subclasses of the _______ class. (2 points)

	Object
	Reference
	String
	this
	Wrapper

19.

Assume the Student and Employee classes each extend the Person class. The Student class overrides the getMoney method in the Person class. Consider the following code: Person p1, p2, p3; int m1, m2, m3; p1 = new Person(); m1 = p1.getMoney(); // assignment 1 p2 = new Student(); m2 = p2.getMoney(); // assignment 2 p3 = new Employee(); m3 = p3.getMoney(); // assignment 3 The reference to getMoney in assignment 2 is to the ________ class. (2 points)

	Child
	Person
	Student
	Employee
	this cannot be determined by examining the code

20.

Assume the Student and Employee classes each extend the Person class. The Student class overrides the getMoney method in the Person class. Consider the following code: Person p1, p2, p3; int m1, m2, m3; p1 = new Person(); m1 = p1.getMoney(); // assignment 1 p2 = new Student(); m2 = p2.getMoney(); // assignment 2 p3 = new Employee(); m3 = p3.getMoney(); // assignment 3 The reference to getMoney in assignment 3 is to the ________ class. (2 points)

	Child
	Employee
	Person
	Student
	this cannot be determined by examining the code