1Z0-811 Arrays and Methods Practice Question
A team is developing a Java application for an online store. The application has a class 'Inventory' that maintains an array of 'Product' objects. The method 'public void addProduct(Product p)' is intended to add a product to the array. The current implementation uses a fixed-size array of length 100. However, the business has grown, and the array may exceed its capacity. The team needs a solution that allows dynamic resizing without changing the method signature. Which approach should the team take?
⚠ Common exam trap
Many candidates think changing the return type or parameter type is acceptable, but the question explicitly requires keeping the method signature unchanged, so only internal implementation changes are allowed.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Modify the method to use an ArrayList<Product> internally and keep the signature.
Using an ArrayList<Product> internally allows the array to dynamically resize as needed, while keeping the method signature unchanged. The method still accepts a Product parameter, but the internal implementation leverages ArrayList's automatic capacity management, eliminating the fixed-size constraint.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Modify the method to use an ArrayList<Product> internally and keep the signature.
Why this is correct
Allows dynamic resizing with same signature.
- ✗
Change the method signature to accept a Product[] array and copy all elements.
Why it's wrong here
Changes signature; breaks existing code.
- ✗
Use a Collection<Product> as parameter and convert to array.
Why it's wrong here
Changes parameter type; callers must change.
- ✗
Change the return type to boolean and return false if array is full.
Why it's wrong here
Changes return type; callers need modification.
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