Given a method that must ensue that its parameter is not null: Line 1. public void someMethod(Object value) { Line 2. // check for null value Line 3. System.out.println(value.getClass()); Line 4. } What, inserted at line 2, is the appropriate way to handle a null value? A. assert value == null; B. assert value !null, “value is null”; C. if (value == null) { throw new AssertionException(”value is null”); D. if (value == null) { throw new IllegalArgumentException(”value is null”);

technology programming languages

  1. A

  2. B

  3. C

  4. D

Show answer
Correct Option: D

AI Explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) A. assert value == null; - This option is incorrect because the assert statement is used for debugging purposes and is typically disabled in production code. It is not an appropriate way to handle a null value.

Option B) B. assert value !null, “value is null”; - This option is incorrect because the syntax is incorrect. The correct syntax for checking if a value is not null is value != null (without the exclamation mark).

Option C) C. if (value == null) { throw new AssertionException(”value is null”); - This option is incorrect because AssertionException is not a standard exception in Java. It is not appropriate to throw an assertion-specific exception to handle a null value.

Option D) D. if (value == null) { throw new IllegalArgumentException(”value is null”); - This option is correct because IllegalArgumentException is a standard exception in Java that is commonly used to indicate that an argument passed to a method is invalid. Throwing an IllegalArgumentException with an appropriate error message is an appropriate way to handle a null value in this context.

The correct answer is D. This option is correct because it uses the appropriate exception (IllegalArgumentException) to handle a null value.

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