Explanations “Top Java Quiz Questions”

Which of the following are valid Java identifiers? (Choose all that apply)

✅ A. A$B
✅ B. _helloWorld
❌ C. true
❌ D. java.lang
✅ E. Public
❌ F. 1980_s

Explanation:
Option A is valid because you can use the dollar sign in identifiers. Option B is
valid because you can use an underscore in identifiers. Option C is not a valid identifier
because true is a Java reserved word. Option D is not valid because the dot (.) is not allowed in identifiers. Option E is valid because Java is case sensitive, so Public is not a reserved word and therefore a valid identifier. Option F is not valid because the first character is not a letter, $, or _.

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287 viewsedited  Jan 3, 2021 at 15:02

Which of the following are valid Java identifiers? (Choose all that apply)

✅ A. A$B
✅ B. _helloWorld
❌ C. true
❌ D. java.lang
✅ E. Public
❌ F. 1980_s

Explanation:
Option A is valid because you can use the dollar sign in identifiers. Option B is
valid because you can use an underscore in identifiers. Option C is not a valid identifier
because true is a Java reserved word. Option D is not valid because the dot (.) is not allowed in identifiers. Option E is valid because Java is case sensitive, so Public is not a reserved word and therefore a valid identifier. Option F is not valid because the first character is not a letter, $, or _.

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