3 ArrayList Mistakes Every Beginner Makes ❌ #dsa #java #shortsfeed #shorts #ytshorts #short #fypシ

Are you making these 3 Silent Mistakes with ArrayLists in Java? 🛑

Mistake 1: Removing from Index 0 🐢
Doing `list.remove(0)` forces the entire array to shift left. This is O(N) time complexity.
✅ Solution: Remove from the end (O(1)) or use a LinkedList!

Mistake 2: Fixed-Size Crash 💥
`Arrays.asList()` creates a fixed-size list. Adding to it throws an UnsupportedOperationException.
✅ Solution: Wrap it
`new ArrayList (Arrays.asList(...))`

Mistake 3: The Loop Crash (ConcurrentModificationException) 💀
If you try to remove an item inside a `for-each` loop, Java throws this error.
✅ Solution: Always use the `Iterator.remove()` method to safely delete items while looping!

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Видео 3 ArrayList Mistakes Every Beginner Makes ❌ #dsa #java #shortsfeed #shorts #ytshorts #short #fypシ канала Chetna Patankar