If A "Is-A" B, what else can we say about the relationship between class A and class B?

Class A extends class B

Class A inherits from class B

Class A derives from class B.

None of the above.

All of the above.

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Question 21 pts

What tool is used to show inheritance or composition relationships among classes.

a class diagram

a flow chart

an object diagram

a family tree

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Question 31 pts

Which of the following is a specialized version of a class.

an ancestor

a subclass

a superclass

class Object

class Class

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Question 41 pts

Which of the following statements is true?

Objects NEVER change the class to which they belong.

In some situations, a variable may be bound to DIFFERENT types of objects.

The behavior of any object is determined by the OBJECT'S CLASS and not by the data type of the variable that references it.

All of the above.

None of the above.

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Question 51 pts

Given this start to a class definition: public class Beta extends Alpha { ... } What is true about instance variables from Alpha?

Class Beta must redeclare all of Alpha's instance variables.

They should not be redeclared in Beta.

The Beta class should redeclare only those instance variables from Alpha that it wants.

Class Beta should redeclare only the private instance variables from Alpha.

None of the above

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Question 61 pts

If class Fruit is the superclass of class Apple, which of the following is also true?

Fruit is the base class of Apple

Fruit is the parent class of Apple

Apple "Is-A" Fruit

All of the above

None of the above

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Question 71 pts

If a class definition does not include the keyword extends, which of the following is true?

The class has no sub class

The class has no super class

The class implicitly derives from Class.

The class implicitly derives from Object.

None of the above

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Question 81 pts

Which of the following things would prevent a method declaration in a subclass from properly overriding an inherited method?

not matching the method name

not matching the return type

not matching the parameter "signature" (number, order and data types of parameters)

trying to make a public method private

All of the above

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Question 91 pts

What is always the very first thing that occurs in the constructor of a derived class?

instance variables are initialized

the value true is returned

a call to the superclass constructor is made

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Question 101 pts

Which of the following statements creates a composition (or aggregation) relationship?

public class Fun extends Hun { ... }

return new Fun();

if ( myThing instanceof Point ) { ... }

private Widget myThing;

Boo Hoo