Multiple choice java

Which of the following class level (nonlocal) variable declarations will not compile?

  1. protected int a;

  2. transient int b = 3;

  3. private synchronized int e;

  4. volatile int d;

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The 'synchronized' modifier applies only to methods and code blocks, not to class-level variable declarations. Therefore, 'private synchronized int e' is invalid. 'transient' and 'volatile' are valid field modifiers, and 'protected' is a valid access modifier for fields.

AI explanation

To answer this question, we need to understand the rules and restrictions for declaring class-level (nonlocal) variables in Java.

Let's go through each option to understand why it is correct or incorrect:

Option A) protected int a; This option is correct because there are no syntax errors or restrictions with declaring a protected class-level variable in Java.

Option B) transient int b = 3; This option is correct because there are no syntax errors or restrictions with declaring a transient class-level variable in Java.

Option C) private synchronized int e; This option is incorrect because it violates the rules for declaring class-level variables. In Java, the synchronized modifier is not allowed for class-level variables. It can only be used for instance-level methods or blocks.

Option D) volatile int d; This option is correct because there are no syntax errors or restrictions with declaring a volatile class-level variable in Java.

Therefore, the correct answer is C) private synchronized int e. This option will not compile because the synchronized modifier is not allowed for class-level variables in Java.

Please select the most appropriate option.

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