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