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Review Summary
You've built a solid foundation for the custom ArrayList, and the overall structure is well done. However, a few changes are needed to meet all the task requirements.
Here are the key points to address:
- Array Growth Factor: The internal array should grow 1.5 times its current size when full. Your implementation currently doubles it. Please adjust this logic and declare the growth factor as a constant.
- Use of
System.arraycopy(): The requirements explicitly state to useSystem.arraycopy()for moving elements within the array (e.g., when adding or removing elements) and for copying elements to a new array during resizing. Your solution currently usesforloops for these operations. [CHECKLIST ITEM #8] - Informative Exceptions: The
NoSuchElementExceptionshould be thrown with a descriptive message explaining why the exception occurred. [CHECKLIST ITEM #10]
Please make these adjustments. You're very close to a complete solution!
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Important
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Footnotes
| for (int i = size; i > index; i--) { | ||
| elements[i] = elements[i - 1]; | ||
| } |
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This violates checklist item #8: 'Use [System.arraycopy()] to move your array elements.' You should use System.arraycopy() to shift the elements to the right instead of a manual loop.
| for (int i = index; i < size - 1; i++) { | ||
| elements[i] = elements[i + 1]; | ||
| } |
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This violates checklist item #8: 'Use [System.arraycopy()] to move your array elements.' Please use System.arraycopy() to shift elements to the left after removing an element.
| return remove(i); | ||
| } | ||
| } | ||
| throw new NoSuchElementException(); |
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This violates checklist item #10: 'Make your exceptions informative.' The NoSuchElementException should be thrown with a descriptive message explaining why the exception occurred.
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| private void ensureCapacity() { | ||
| if (size == elements.length) { | ||
| Object[] newArray = new Object[elements.length * 2]; |
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The task requires the internal array to grow 1.5 times when it's full. This implementation doubles the capacity (* 2), which does not meet the requirement. Also, the growth factor should be a constant.
| for (int i = 0; i < elements.length; i++) { | ||
| newArray[i] = elements[i]; | ||
| } |
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This violates checklist item #8: 'Use [System.arraycopy()] to move your array elements.' You should use System.arraycopy() to copy elements to the new, larger array.
mateacademy-ai-mentor
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Review Summary
Excellent work on this revision! You've successfully addressed all the previous feedback, and your ArrayList implementation is now functionally complete and correct. I am approving your solution.
The build is failing due to a couple of minor style issues reported by checkstyle. Please fix them to get a green build:
- Declaration Order: Static variables like
DEFAULT_CAPACITYandGROWTH_FACTORshould be declared before instance variables. - Variable Usage Distance: In the
remove(int index)method, theremovedvariable is declared a bit too far from its final use. You can fix this by combining the last two lines before the return intoelements[--size] = null;.
Great job implementing the core logic and handling all the requirements!
✨ Please rate this review in the Platform's notification center1. I will be grateful for your feedback! ✨
Footnotes
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