14. Inheritance is a form of software reuse.
SOLUTION MANUAL
All Chapters Included
, 14. Inheritance is a form of software reuse.
Table of Contents
1. Introduction
2. Data and Expressions
3. Using Classes and Objects
4. Writing Classes
5. Conditionals and Loops
6. More Conditionals and Loops
7. Object-Oriented Design
8. Arrays
9. Inheritance
10. Polymorphism
11. Exceptions
12. Recursion
13. Collections
TRUE/FALSE
1. All information is stored in the computer using binary numbers.
ANSWER: T
The computer is a digital device meaning that it stores information in one of two states
using binary.We must determine then how to represent meaningful information (such
as a name or a program instruction or an image) in binary.
2. Java is an object-oriented programming language.
ANSWER: T
Java is classified as a high-level programming language but it is also classified as an
object-orientedprogramming language because it allows the programmer to
implement data structures as classes.
, 14. Inheritance is a form of software reuse.
3. System.out.printis used in a program to denote that a documentation comment follows.
ANSWER: F
Documentation comments follow // marks or are embedded between */ and */.
System.out.printis an instruction used to output a message to the screen (the Java
consolewindow).
4. Java byte codes are directly executable whereas Java source code is not.
ANSWER: F
Neither Java source code nor Java byte codes are executable. Both must be compiled
or interpretedinto machine code. Java byte codes are useful however in that they
are machine-independent but semi-compiled code that allows your Java code to be
transmitted over the Internet and executed onanother computer even if that other
computer is a completely different type.
5. The Java compiler is able to find all programmer errors.
ANSWER: F
The Java compiler can find syntax errors but cannot find either logical errors (errors
that are caused because of poor logic in writing the program) or run-time errors
(errors that arise during the executionof the program).
6. Java is a case-sensitive language which means Current, CURRENT, and currentwill all
referencethe same identifier.
ANSWER: F
identifier consistently in terms of upper and lower case characters.
7. Code placed inside of comments will not be compiled and, therefore, will not execute.
ANSWER: T
The compiler discards comments; therefore, any code inside a comment is discarded
and is notcompiled. Your executable program consists only of the code that is compiled.
8. The word Publicis a reserved word.
ANSWER: F
publicis a reserved word, but since Java is case sensitive, Publicdiffers from publicand
therefore Publicis not a reserved word.
9. Reserved words in Java can be redefined by the programmer to mean something
other than theiroriginal intentions.
, 14. Inheritance is a form of software reuse.
ANSWER: F
Java reserved words cannot be redefined.
10. In a Java program, dividing by zero is a syntax error.
ANSWER: F
Dividing by 0 is not detected at compile time, and because a computer cannot divide by
0, this is a run-time error.
11. In a Java program, dividing by zero is a syntax error.
ANSWER: F
Dividing by 0 is not detected at compile time, and because a computer cannot divide by
0, this is a run-time error.
12. During translation, the compiler puts its output (the compiled Java
program) into ROM.ANSWER: F
ROM stands for read-only-memory. The compiled output (the byte codes) may be
placed into RAM(writable random access memory) or into a file (on your hard drive,
for example).
13. Objects are defined by a class that describes the characteristics common to all instances of
the class.
ANSWER: T
An object is an instance of a class. And, the purpose of a class is to describe
these commoncharacteristics.
ANSWER: T
Inheritance allows us to capitalize on the similarities among various kinds of classes
that have acommon base (parent) class. Thus we reuse the base class each time a class
inherits from it.
15. Polymorphism is the idea that we can refer to multiple types of related objects in
consistent ways.
ANSWER: T
Polymorphism allows us to use the same name for similar behaviors that occur
among diverse andpossibly unrelated objects. For example, to "open" may refer to a
file, or to a device, or to a communications line, etc. The same term, "open," is being
used even though the objects that are being opened are quite different.
16. In Java, identifiers may be of any length up to a limit determined by the compiler.
SOLUTION MANUAL
All Chapters Included
, 14. Inheritance is a form of software reuse.
Table of Contents
1. Introduction
2. Data and Expressions
3. Using Classes and Objects
4. Writing Classes
5. Conditionals and Loops
6. More Conditionals and Loops
7. Object-Oriented Design
8. Arrays
9. Inheritance
10. Polymorphism
11. Exceptions
12. Recursion
13. Collections
TRUE/FALSE
1. All information is stored in the computer using binary numbers.
ANSWER: T
The computer is a digital device meaning that it stores information in one of two states
using binary.We must determine then how to represent meaningful information (such
as a name or a program instruction or an image) in binary.
2. Java is an object-oriented programming language.
ANSWER: T
Java is classified as a high-level programming language but it is also classified as an
object-orientedprogramming language because it allows the programmer to
implement data structures as classes.
, 14. Inheritance is a form of software reuse.
3. System.out.printis used in a program to denote that a documentation comment follows.
ANSWER: F
Documentation comments follow // marks or are embedded between */ and */.
System.out.printis an instruction used to output a message to the screen (the Java
consolewindow).
4. Java byte codes are directly executable whereas Java source code is not.
ANSWER: F
Neither Java source code nor Java byte codes are executable. Both must be compiled
or interpretedinto machine code. Java byte codes are useful however in that they
are machine-independent but semi-compiled code that allows your Java code to be
transmitted over the Internet and executed onanother computer even if that other
computer is a completely different type.
5. The Java compiler is able to find all programmer errors.
ANSWER: F
The Java compiler can find syntax errors but cannot find either logical errors (errors
that are caused because of poor logic in writing the program) or run-time errors
(errors that arise during the executionof the program).
6. Java is a case-sensitive language which means Current, CURRENT, and currentwill all
referencethe same identifier.
ANSWER: F
identifier consistently in terms of upper and lower case characters.
7. Code placed inside of comments will not be compiled and, therefore, will not execute.
ANSWER: T
The compiler discards comments; therefore, any code inside a comment is discarded
and is notcompiled. Your executable program consists only of the code that is compiled.
8. The word Publicis a reserved word.
ANSWER: F
publicis a reserved word, but since Java is case sensitive, Publicdiffers from publicand
therefore Publicis not a reserved word.
9. Reserved words in Java can be redefined by the programmer to mean something
other than theiroriginal intentions.
, 14. Inheritance is a form of software reuse.
ANSWER: F
Java reserved words cannot be redefined.
10. In a Java program, dividing by zero is a syntax error.
ANSWER: F
Dividing by 0 is not detected at compile time, and because a computer cannot divide by
0, this is a run-time error.
11. In a Java program, dividing by zero is a syntax error.
ANSWER: F
Dividing by 0 is not detected at compile time, and because a computer cannot divide by
0, this is a run-time error.
12. During translation, the compiler puts its output (the compiled Java
program) into ROM.ANSWER: F
ROM stands for read-only-memory. The compiled output (the byte codes) may be
placed into RAM(writable random access memory) or into a file (on your hard drive,
for example).
13. Objects are defined by a class that describes the characteristics common to all instances of
the class.
ANSWER: T
An object is an instance of a class. And, the purpose of a class is to describe
these commoncharacteristics.
ANSWER: T
Inheritance allows us to capitalize on the similarities among various kinds of classes
that have acommon base (parent) class. Thus we reuse the base class each time a class
inherits from it.
15. Polymorphism is the idea that we can refer to multiple types of related objects in
consistent ways.
ANSWER: T
Polymorphism allows us to use the same name for similar behaviors that occur
among diverse andpossibly unrelated objects. For example, to "open" may refer to a
file, or to a device, or to a communications line, etc. The same term, "open," is being
used even though the objects that are being opened are quite different.
16. In Java, identifiers may be of any length up to a limit determined by the compiler.
