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Introduction to Programming with Java: A Problem Solving Approach

John Dean, Ray Dean

Chapter 14

Type Details and Alternative Coding Mechanisms - all with Video Answers

Educators

Section 1

Review Questions

Problem 1

If you want a class you define to inherit methods from the Object class, you
must append the suffix extends Object to your class’s heading. (T / F)

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Problem 2

When used to compare reference variables, the == operator works the same
as the Object class’s equals method. (T / F)

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Problem 3

What does the equals method defined in the String class compare?

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Problem 4

What is returned by the Object class’s toString method?

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Problem 5

What’s wrong with replacing the println statement in Figure 14.2’s main
method with these two statements?
String description = car.toString();
System.out.println(description);

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Problem 6

The return type of an overriding method must be the same as the return type
of the overridden method. (T / F)

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Problem 7

In Java, polymorphic method calls are bound to method definitions at
compile time (not runtime). (T / F)

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Problem 8

Assume one reference variable’s class is descended from another reference
variable’s class. To be able to assign one reference variable to the other one
(without using a cast operator), the left-side variable’s class must be a(n)
______________ of the right-side reference variable’s class.

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Problem 9

A given array may contain different types of elements. (T / F)

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Problem 10

What are the syntax features of an abstract method?

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Problem 11

Any class that contains an abstract method must be declared to be an
abstract class. (T / F)

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Problem 12

You cannot instantiate an abstract class. (T / F)

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Problem 13

You can use an interface to provide direct access to a common set of
constants from many different classes. (T / F)

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Problem 14

You can declare reference variables to have an interface type and use them
just as you would use reference variables declared to be the type of a class
in an inheritance hierarchy. (T / F)

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Problem 15

Describe the access provided by the protected modifier.

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Problem 16

It’s illegal to use private for any method that overrides an abstract method.
(T / F)

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