3) Which of the following are valid identifiers in java? A) final B) 4Execution C) _under$core D) $monthlyrent
3) Which of the following are valid identifiers in java? A) final B) 4Execution C) _under$core D) $monthlyrent
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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How do you do this? JAVA
![### Question 3: Identifiers in Java
**Question:**
Which of the following are *valid* identifiers in Java?
A) final
B) 4Execution
C) _under$core
D) $monthlyrent
**Explanation of Choices:**
- **A) final:** `final` is actually a reserved keyword in Java and cannot be used as an identifier.
- **B) 4Execution:** Identifiers cannot start with a digit. Therefore, this is not a valid identifier.
- **C) _under$core:** This is a valid identifier. Identifiers in Java can start with a letter, underscore (_), or dollar sign ($).
- **D) $monthlyrent:** This is also a valid identifier for the same reason as choice C.
When writing Java programs, it is crucial to adhere to the rules for valid identifiers to avoid syntax errors. Identifiers should begin with a letter, an underscore, or a dollar sign, and subsequent characters can be letters, digits, underscores, or dollar signs. Identifiers cannot be Java reserved keywords.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2fa8496d-6107-42de-bef2-538b720f0bb1%2F540edf61-2903-445a-8b35-121e1ec728ce%2F5mtvxks_processed.jpeg&w=3840&q=75)
Transcribed Image Text:### Question 3: Identifiers in Java
**Question:**
Which of the following are *valid* identifiers in Java?
A) final
B) 4Execution
C) _under$core
D) $monthlyrent
**Explanation of Choices:**
- **A) final:** `final` is actually a reserved keyword in Java and cannot be used as an identifier.
- **B) 4Execution:** Identifiers cannot start with a digit. Therefore, this is not a valid identifier.
- **C) _under$core:** This is a valid identifier. Identifiers in Java can start with a letter, underscore (_), or dollar sign ($).
- **D) $monthlyrent:** This is also a valid identifier for the same reason as choice C.
When writing Java programs, it is crucial to adhere to the rules for valid identifiers to avoid syntax errors. Identifiers should begin with a letter, an underscore, or a dollar sign, and subsequent characters can be letters, digits, underscores, or dollar signs. Identifiers cannot be Java reserved keywords.
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