Chapter 1

Question 1

Java is platform neutral. What does that mean?

Answer 1

It can run without modification on different computing environments.

Question 2

An approach to building computer programs that mimics how objects relate to each other in the real world is known as…

Answer 2

Object-oriented programming

Question 3

A template used to create an object is called a…

Answer 3

Class

Question 4

A self-contained element of a computer program that has certain attributes and can accomplish certain tasks is called an…

Answer 4

Object

Question 5

In a class, attributes are defined using…

Answer 5

Variables

Question 6

Variables that define an attribute of a particular object are called…

Answer 6

Instance variables, or object variables

Question 7

Variables that have the same value in all objects of a class are called…

Answer 7

Class variables

Question 8

The behavior that a class is capable of is defined by …

Answer 8

Methods

Question 9

Groups of related statements in a class that perform a specific task are called…

Answer 9

Methods

Question 10

How many tasks does a well-defined method typically perform?

Answer 10

One

Question 11

What is the Java command for printing text and

moving to the next line?

Answer 11

System.out.println(“Text goes here”);

Question 12

The mechanism that enables one class to possess all the behavior and attributes of another class is called…

Answer 12

Inheritance

Question 13

A class that inherits from another class is called a…

Answer 13

Subclass

Question 14

A class that passes its attributes and behavior to another class is called a

Answer 14

Superclass

Question 15

At the top of the Java class hierarchy is the class called _____________

Answer 15

Object

Question 16

If you create a new class that doesn’t indicate a superclass, Java assumes that the new class inherits directly from what superclass?

Answer 16

Object

Question 17

When you invoke the method of a particular object, how does Java go about attempting to find it in the object hierarchy?

Answer 17

Java looks for the method in the current object. If it doesn’t find it, it moves up the class hierarchy until it finds it.

Question 18

What does it mean to override a method?

Answer 18

Replacing the behavior defined in a method higher up the class hierarchy by creating a method that has the same name.

Question 19

How many superclasses can a Java class have?

Answer 19

One.

This differs from some other languages, such as C++, which can have multiple superclasses.

Question 20

A group of related classes and interfaces is called a ________________.

Answer 20

Package

Question 21

What is the name of the package in which the class “java.lang.Object” is found?

Answer 21

java.lang

Question 22

By default, objects in which Java package do NOT need to include a reference to the package?

Answer 22

java.lang

Question 23

What command is used to import a package so that the classes in those packages can be referenced without including their package names?

Answer 23

import

Question 24

When a Java class imports an entire package, does it increase the compiled size of that class?

Answer 24

No, the sole reason for using the import command is to eliminate the need to refer to the full package names in your code.

Question 25

When you create a subclass, what must you define about that class?

Answer 25

Anything that is different from its superclass.