Core Java · interview question
Which of the following is a reason to prefer using a wrapper type over a primitive type in a Java domain model?
Multiple choiceEasychapter-7-curatedpremiumcore-javawrapper-types-and-autoboxing
Answer and explanation
Correct answer
B. Allows null values for optional fields
Why
Wrapper types like Integer can be null, which allows you to represent optional fields or the absence of a value, unlike primitive types which always have a default value.
Test yourself on Core Java
A free test with instant, explained results. No account needed.
More Core Java questions
- What happens if a class implements two interfaces that have methods with the same signature?
- Given the code snippet below, what will be the result of the comparison using '=='?
- Which of the following variable names is best for storing the total amount in a shopping cart?
- When does a local variable declared inside a method stop existing?
- Which of the following is a checked exception?
- Why might you choose 'int' over 'long' for storing the number of items in a small store's inventory?