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Exam 9: Inheritance

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Question 31

True/False

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Interface classes cannot be extended but classes that implement interfaces can be extended.

A) True
B) False

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Question 32

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Inheritance through an extended (derived) class supports which of the following concepts?

A) interfaces
B) modulary
C) information hiding
D) code reuse
E) correctness

F) B) and C)
G) B) and E)

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Question 33

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Example Code Ch 09-5 Consider the following class definition: public class AClass { protected int x; protected int y; public AClass(int a, int b) { x = a; y = b; } public int addEm() { return x + y; } public void changeEm() { x++; y--; } public String toString() { return "" + x + " " + y; } } -Refer to Example Code Ch 09-5: You want to extend AClass to BClass. BClass will have a third int instance data, z. Which of the following would best define BClass's constructor?

The relationship between a parent class and a child class is referred to as a(n) __________ relationship.

Example Code Ch 09-3 Consider the class Car and the subclass SportsCar. Car has instance data of currentSpeed, type, year, cost, model, color and methods of accelerate, brake, getGasMileage, getInsuranceRate and determineSpeed. -Refer to Example Code Ch 09-3: What methods inherited from Car should SportsCar override?

Example Code Ch 09-2 Assume that Poodle is a derived class of Dog and that Dog d = new Dog(...) and Poodle p = new Poodle(...) where the ... are the necessary parameters for the two classes. -Refer to Example Code Ch 09-2: The assignment statement p = d; is legal even though p is not a Dog.

Which of the following is correct?

Example Code Ch 09-4 Given the following partial class definition: public class A1 { public int x; private int y; protected int z; ... } public class A2 extends A1 { protected int a; private int b; ... } public class A3 extends A2 { private int q; ... } -Refer to Example Code Ch 09-4: Which of the following lists of instance data are accessible in class A3?

Example Code Ch 09-5 Consider the following class definition: public class AClass { protected int x; protected int y; public AClass(int a, int b) { x = a; y = b; } public int addEm() { return x + y; } public void changeEm() { x++; y--; } public String toString() { return "" + x + " " + y; } } -Refer to Example Code Ch 09-5: You want addEm to now add all three values, return the sum, and changeEm to change x and y, but leave z alone. Which should you do?