arraylist java problems
Why is ArrayList slow?
Arrays have fixed sizes as we remember.
Besides, ArrayList resizes itself and this operation slows its performance.
Furthermore, ArrayLists can hold only Objects, and they usually store more place than Arrays.
Even though Arrays are faster than ArrayLists, fast execution consumes more memory than ArrayList.The ArrayList data structure is a not type-safe, nor strongly-typed.
You cannot guarantee what type of object is in an ArrayList , thus everything is stored as an Object , similar to how objects are stored in Session cache for ASP.NET.
What is the disadvantage of ArrayList in Java?
If a data entry is added to or removed from an array-based list, data needs to be shifted to update the list.
In the worst case, for an array-based list with n data entries, an add and a remove takes O(n) time.
Also, all data in the array-based list must be stored sequentially in memory.
Why not always use ArrayList?
ArrayLists usually allocate about twice the memory you need now in advance so that you can append items very fast.
So there is wastage if you are never going to add any more items.
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