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Review Summary
Great work on the ArrayList implementation! Your solution is very close, but it requires a few changes to meet all the requirements. Specifically, there are three checklist items that need to be addressed. First, the array growth logic should be exactly 1.5 times the current capacity; your formula capacity * 3 / 2 + 1 should be adjusted to capacity * 3 / 2. Second, the default capacity (10) and growth factors (3, 2) are hardcoded and must be declared as private static final constants [CHECKLIST ITEM #3]. Finally, the method name ensureCapacity isn't fully descriptive; a name like growIfFull would better reflect its conditional behavior [CHECKLIST ITEM #6]. After fixing these points, your code will be ready for approval!
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Important
Fix the issues, commit the changes, and then re-request my review using the Re-request review button2 in the Reviewers tab.
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Footnotes
| import java.util.NoSuchElementException; | ||
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| public class ArrayList<T> implements List<T> { | ||
| private int capacity = 10; |
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This violates checklist item #3: 'Any magic numbers should be constants'. The default capacity 10 should be declared as a private static final constant with an informative name, for example, DEFAULT_CAPACITY.
| return size == 0; | ||
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| private void ensureCapacity() { |
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This violates checklist item #6: 'Use informative names for your variables and methods'. The name ensureCapacity is not ideal because the method contains conditional logic. According to the checklist, a name like growIfFull would be more descriptive, as the array only grows when the condition size == capacity is met.
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| private void ensureCapacity() { | ||
| if (size == capacity) { | ||
| capacity = capacity * 3 / 2 + 1; |
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This growth logic deviates from the requirement to behave like java.util.ArrayList, which grows by exactly 1.5 times. The + 1 part should be removed. Additionally, this line violates checklist item #3: 'Any magic numbers should be constants'. The numbers 3 and 2 should be extracted into named constants.
mateacademy-ai-mentor
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Review Summary
Great job addressing most of the feedback from the previous review! You've corrected the array growth formula and improved the method naming, which is a significant improvement.
However, one critical requirement still needs your attention. The magic numbers used for the default capacity and growth factor must be declared as constants. This is a violation of a core requirement [CHECKLIST ITEM #3].
Please declare the default capacity (10) and the growth factors (3 and 2) as private static final constants and use them instead of the hardcoded values. Once that's done, your solution will be ready for approval!
✨ Please rate this review in the Platform's notification center1. I will be grateful for your feedback! ✨
Important
Fix the issues, commit the changes, and then re-request my review using the Re-request review button2 in the Reviewers tab.
Tip
If you have any comments about this review, please leave a message in the Add a comment section below and mention me with the @mateacademy-ai-mentor tag3.
I will read your message during my next review of your pull request. Please do not reply directly to my comments, as that feature is not supported yet.
Caution
Do not close the pull request until the review is complete. Closing it early can lead to unexpected behavior and disrupt the review process.
Footnotes
| import java.util.NoSuchElementException; | ||
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| public class ArrayList<T> implements List<T> { | ||
| private int capacity = 10; |
There was a problem hiding this comment.
This violates checklist item #3: 'Any magic numbers should be constants'. The default capacity should be defined as a private static final constant, for example, DEFAULT_CAPACITY, and used for initialization here.
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| private void growIfFull() { | ||
| if (size == capacity) { | ||
| capacity = capacity * 3 / 2; |
There was a problem hiding this comment.
This violates checklist item #3: 'Any magic numbers should be constants'. The growth factor values 3 and 2 are magic numbers. They should be extracted into named constants to improve readability and maintainability.
mateacademy-ai-mentor
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mateacademy-ai-mentor
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Review Summary
I'm providing an educational approval for this solution to help you move forward, as your implementation is very close to perfect. You did an excellent job addressing the previous feedback by making DEFAULT_CAPACITY a constant! The only remaining issue is that the numbers used for the array growth calculation (3 and 2) are still hardcoded. To fully meet the requirements, these should also be declared as private static final constants, which makes the code more readable and easier to maintain. [CHECKLIST ITEM #3] Fantastic work on this task, keep this feedback in mind for the future!
✨ Please rate this review in the Platform's notification center1. I will be grateful for your feedback! ✨
Footnotes
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| private void growIfFull() { | ||
| if (size == capacity) { | ||
| capacity = capacity * 3 / 2; |
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This still violates checklist item #3: 'Any magic numbers should be constants'. The growth factors 3 and 2 should be declared as named constants, similar to how DEFAULT_CAPACITY is handled. This was also a key point from the previous review.
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