Core Java · interview question
How can autoboxing lead to a subtle bug when comparing Integer objects using '=='?
Multiple choiceHardchapter-7-curatedpremiumcore-javawrapper-types-and-autoboxing
Answer and explanation
Correct answer
B. Different Integer objects with the same value may not be equal
Why
Using '==' for Integer objects checks reference equality, not value equality. This can lead to bugs when different Integer objects with the same value are not equal, especially outside the cached range.
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?