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Which of the following are valid Java identifiers? D. my variable A. $myvariable B. OReilly_&_Associates C. _score E. !digit F._9Levels G. interface H. 9pins I. main J. This_is_an_insanely_long_va

Which of the following are valid Java identifiers? D. my variable A. $myvariable B. OReilly_&_Associates C. _score E. !digit F._9Levels G. interface H. 9pins I. main J. This_is_an_insanely_long_va

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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### Question: Valid Java Identifiers **Which of the following are valid Java identifiers?** - A. `$myvariable` - B. `OReilly_&_Associates` - C. `_score` - D. `my variable` - E. `1digit` - F. `_9Levels` - G. `interface` - H. `9pins` - I. `main` - J. `This_is_an_insanely_long_variable` #### Explanation: In Java, an identifier is a name given to a variable, method, class, or any other user-defined item. There are certain rules that must be followed to define valid identifiers. Below are the rules and explanations: 1. **$myvariable** - Valid: Java allows identifiers to start with a dollar sign ($). 2. **OReilly_&_Associates** - Invalid: Identifiers cannot contain the ampersand (&) symbol. 3. **_score** - Valid: Identifiers can start with an underscore (_). 4. **my variable** - Invalid: Identifiers cannot contain spaces. 5. **1digit** - Invalid: Identifiers cannot start with a digit. 6. **_9Levels** - Valid: Identifiers can start with an underscore (_), followed by digits or letters. 7. **interface** - Invalid: 'interface' is a reserved keyword in Java. 8. **9pins** - Invalid: Identifiers cannot start with a digit. 9. **main** - Valid: Although 'main' is not a reserved keyword, it is often used as a method name. It is still a valid identifier. 10. **This_is_an_insanely_long_variable** - Valid: There is no limit on the length of an identifier, making this valid.
Transcribed Image Text:### Question: Valid Java Identifiers **Which of the following are valid Java identifiers?** - A. `$myvariable` - B. `OReilly_&_Associates` - C. `_score` - D. `my variable` - E. `1digit` - F. `_9Levels` - G. `interface` - H. `9pins` - I. `main` - J. `This_is_an_insanely_long_variable` #### Explanation: In Java, an identifier is a name given to a variable, method, class, or any other user-defined item. There are certain rules that must be followed to define valid identifiers. Below are the rules and explanations: 1. **$myvariable** - Valid: Java allows identifiers to start with a dollar sign ($). 2. **OReilly_&_Associates** - Invalid: Identifiers cannot contain the ampersand (&) symbol. 3. **_score** - Valid: Identifiers can start with an underscore (_). 4. **my variable** - Invalid: Identifiers cannot contain spaces. 5. **1digit** - Invalid: Identifiers cannot start with a digit. 6. **_9Levels** - Valid: Identifiers can start with an underscore (_), followed by digits or letters. 7. **interface** - Invalid: 'interface' is a reserved keyword in Java. 8. **9pins** - Invalid: Identifiers cannot start with a digit. 9. **main** - Valid: Although 'main' is not a reserved keyword, it is often used as a method name. It is still a valid identifier. 10. **This_is_an_insanely_long_variable** - Valid: There is no limit on the length of an identifier, making this valid.
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