task competed#1770
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Review Summary
This requires changes. While you've correctly implemented the core logic for capacity and growth, your solution violates several critical requirements from the task checklist.
Here are the main points to address:
- Use of
System.arraycopy(): The task explicitly requires usingSystem.arraycopy()for moving elements within the array. Your implementation usesforloops in thegrow(),add(T value, int index), andremove(int index)methods, which needs to be corrected. [CHECKLIST ITEM #8] - Forbidden Utility Class: The use of
Math.max()is not allowed, asMathis a utility class forbidden by the task rules. You should replace this with your own logic. [CHECKLIST ITEM #2] - Duplicated Code: The index validation logic is repeated in the
get(),set(), andremove(int)methods. Please extract this into a separate private method to adhere to the DRY (Don't Repeat Yourself) principle. [CHECKLIST ITEM #5]
Please revise your code to meet these requirements.
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Important
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Footnotes
| if (elements == null) { | ||
| throw new IllegalArgumentException("Array cannot be null"); | ||
| } | ||
| this.elements = new Object[Math.max(DEFAULT_CAPACITY, elements.length)]; |
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This violates checklist item #2: 'Don't use Objects, Arrays, or any other util class'. The Math class is considered a utility class. You should implement this logic without using external library methods.
| for (Object newArray : this.elements) { | ||
| newElements[i] = newArray; | ||
| i++; | ||
| } |
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This violates checklist item #8: 'Use System.arraycopy() to move your array elements'. A for loop is used to copy the elements to the new array, but the task requires you to use System.arraycopy() for this operation.
| if (index < 0 || index > size) { | ||
| throw new ArrayListIndexOutOfBoundsException("Index " | ||
| + index + " out of bounds for size " + size); | ||
| } |
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This violates checklist item #5: 'Don't create repeating code'. The logic for checking if an index is out of bounds is repeated in the get(), set(), and remove(int) methods. This should be extracted into a separate private method to avoid duplication.
| for (int i = size - 1; i >= index; i--) { | ||
| elements[i + 1] = elements[i]; | ||
| } |
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This violates checklist item #8: 'Use System.arraycopy() to move your array elements'. Instead of manually shifting elements in a loop, you should use a single call to System.arraycopy().
| for (int i = index; i < size - 1; i++) { | ||
| this.elements[i] = this.elements[i + 1]; |
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This violates checklist item #8: 'Use System.arraycopy() to move your array elements'. This loop to shift elements after removal should be replaced with System.arraycopy() as required by the task.
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Review Summary
Great job addressing most of the feedback from the last review! Your use of System.arraycopy() and the refactored index validation method have really improved the code.
However, changes are still needed because your solution uses a forbidden utility class. The ArrayList(T[] elements) constructor still uses Math.max(), which violates the task requirements [CHECKLIST ITEM #2]. You can easily replace this with a ternary operator or a simple if-else statement.
I also noticed a small issue: the variable resoul in the arrayListIndexOutOfBoundException method is declared but never used and should be removed.
Please fix the use of Math.max(), and your solution will be ready. Keep up the great work!
✨ 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
| if (elements == null) { | ||
| throw new IllegalArgumentException("Array cannot be null"); | ||
| } | ||
| this.elements = new Object[Math.max(DEFAULT_CAPACITY, elements.length)]; |
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The use of Math.max() is not allowed, as Math is a forbidden utility class according to checklist item #2. You should replace this with your own logic, for example, by using a ternary operator or an if-else statement.
| } | ||
|
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| private void arrayListIndexOutOfBoundException(int index) { | ||
| boolean resoul = true; |
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This variable resoul is declared and initialized but is never used. It should be removed to make the code cleaner. This violates the checklist recommendation against creating redundant variables.
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Review Summary
Excellent work on this task! You've done a great job addressing the previous feedback. I am approving your solution as an educational override so you can continue to the next topic. Just keep a couple of things in mind for the future: the ArrayList(T[] elements) constructor could be more efficient using System.arraycopy() instead of a loop [CHECKLIST ITEM #8], and the nested if-else in the remove(T element) method can be simplified for better readability [CHECKLIST ITEM #4]. These are small points in an otherwise strong submission. Keep up the great momentum!
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Footnotes
| for (T elem : elements) { | ||
| this.elements[i] = elem; | ||
| i++; | ||
| } |
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While this loop works correctly, the checklist recommends using System.arraycopy() to move array elements. Applying it here would be more efficient and consistent with the implementation of your other methods. [CHECKLIST ITEM #8]
| if (element == null) { | ||
| if (this.elements[i] == null) { | ||
| index = i; | ||
| break; | ||
| } | ||
| } else { | ||
| if (element.equals(this.elements[i])) { | ||
| index = i; | ||
| break; | ||
| } | ||
| } |
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This nested if-else structure can be simplified into a single if statement with a compound condition. This would make the code more concise and easier to read, in line with the guideline to avoid complicated if-else constructions. [CHECKLIST ITEM #4]
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