Starting Out with Java: From Control Structures through Objects (7th Edition) (What's New in Computer Science)

7th Edition

ISBN: 9780134802213

Author: Tony Gaddis

Publisher: PEARSON

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Textbook Question

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Chapter 9, Problem 1MC

The isDigit, isLetter, and isLetterOrDigit methods are members of this class.

a. String
b. Char
c. Character
d. StringBuilder

Expert Solution & Answer

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Program Description Answer

Methods of the class:

The methods “isDigit”, “isLetter”and “isLetterOrDigit” are some of the members of the class “Character”.

Hence, the correct answer is option “C”.

Explanation of Solution

Character class:

A wrapper class that is used for the char data type is called as “Character” class.
It contains various method for testing and converting the data that is of character type.
The character is a part of “java.lang” package and it does not needed to be imported for using the class.
It contains various static methods for testing the value of the character variables.

Reason for the incorrect answers:

String:

The class is used to represent character of strings.

Hence, the option “A” is wrong.

Char:

“char” is considered as the data type but not the class.

Hence, the option “B” is wrong.

StringBuilder:

The class is used to create a changeable strings and it is similar to String objects.

Hence, the option “D” is wrong.

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Chapter 9.6, Problem 9.31CP

Chapter 9, Problem 2MC

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Chapter 9 Solutions

Starting Out with Java: From Control Structures through Objects (7th Edition) (What's New in Computer Science)

Ch. 9.2 - Prob. 9.1CP Ch. 9.2 - Write an if statement that displays the word digit... Ch. 9.2 - Prob. 9.3CP Ch. 9.2 - Write a loop that asks the user, Do you want to... Ch. 9.2 - Prob. 9.5CP Ch. 9.2 - Write a loop that counts the number of uppercase... Ch. 9.3 - Prob. 9.7CP Ch. 9.3 - Modify the method you wrote for Checkpoint 9.7 so... Ch. 9.3 - Look at the following declaration: String cafeName... Ch. 9.3 - Prob. 9.10CP

Ch. 9.3 - Prob. 9.11CP Ch. 9.3 - Prob. 9.12CP Ch. 9.3 - Prob. 9.13CP Ch. 9.3 - Look at the following code: String str1 = To be,... Ch. 9.3 - Prob. 9.15CP Ch. 9.3 - Assume that a program has the following... Ch. 9.4 - Prob. 9.17CP Ch. 9.4 - Prob. 9.18CP Ch. 9.4 - Prob. 9.19CP Ch. 9.4 - Prob. 9.20CP Ch. 9.4 - Prob. 9.21CP Ch. 9.4 - Prob. 9.22CP Ch. 9.4 - Prob. 9.23CP Ch. 9.4 - Prob. 9.24CP Ch. 9.5 - Prob. 9.25CP Ch. 9.5 - Prob. 9.26CP Ch. 9.5 - Look at the following string:... Ch. 9.5 - Prob. 9.28CP Ch. 9.6 - Write a statement that converts the following... Ch. 9.6 - Prob. 9.30CP Ch. 9.6 - Prob. 9.31CP Ch. 9 - The isDigit, isLetter, and isLetterOrDigit methods... Ch. 9 - Prob. 2MC Ch. 9 - The startsWith, endsWith, and regionMatches... Ch. 9 - The indexOf and lastIndexOf methods are members of... Ch. 9 - Prob. 5MC Ch. 9 - Prob. 6MC Ch. 9 - Prob. 7MC Ch. 9 - Prob. 8MC Ch. 9 - Prob. 9MC Ch. 9 - Prob. 10MC Ch. 9 - To delete a specific character in a StringBuilder... Ch. 9 - Prob. 12MC Ch. 9 - This String method breaks a string into tokens. a.... Ch. 9 - These static final variables are members of the... Ch. 9 - Prob. 15TF Ch. 9 - Prob. 16TF Ch. 9 - True or False: If toLowerCase methods argument is... Ch. 9 - True or False: The startsWith and endsWith methods... Ch. 9 - True or False: There are two versions of the... Ch. 9 - Prob. 20TF Ch. 9 - Prob. 21TF Ch. 9 - Prob. 22TF Ch. 9 - Prob. 23TF Ch. 9 - int number = 99; String str; // Convert number to... Ch. 9 - Prob. 2FTE Ch. 9 - Prob. 3FTE Ch. 9 - Prob. 4FTE Ch. 9 - The following if statement determines whether... Ch. 9 - Write a loop that counts the number of space... Ch. 9 - Prob. 3AW Ch. 9 - Prob. 4AW Ch. 9 - Prob. 5AW Ch. 9 - Modify the method you wrote for Algorithm... Ch. 9 - Prob. 7AW Ch. 9 - Look at the following string:... Ch. 9 - Assume that d is a double variable. Write an if... Ch. 9 - Write code that displays the contents of the int... Ch. 9 - Prob. 1SA Ch. 9 - Prob. 2SA Ch. 9 - Prob. 3SA Ch. 9 - How can you determine the minimum and maximum... Ch. 9 - Prob. 1PC Ch. 9 - Prob. 2PC Ch. 9 - Prob. 3PC Ch. 9 - Prob. 4PC Ch. 9 - Prob. 5PC Ch. 9 - Prob. 6PC Ch. 9 - Check Writer Write a program that displays a... Ch. 9 - Prob. 8PC Ch. 9 - Prob. 9PC Ch. 9 - Word Counter Write a program that asks the user... Ch. 9 - Sales Analysis The file SalesData.txt, in this... Ch. 9 - Prob. 12PC Ch. 9 - Alphabetic Telephone Number Translator Many... Ch. 9 - Word Separator Write a program that accepts as... Ch. 9 - Pig Latin Write a program that reads a sentence as... Ch. 9 - Prob. 16PC Ch. 9 - Lottery Statistics To play the PowerBall lottery,... Ch. 9 - Gas Prices In the student sample program files for...

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The isDigit, isLetter, and isLetterOrDigit methods are members of this class. a. String b. Char c. Character d. StringBuilder

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Chapter 9 Solutions