Question at position 2 Why is an ArrayList's remove( ) slower than a LinkedList's remove( )?It has to move elementsIt creates a new ArrayList on the heapIt converts the data to a LinkedList firstIt has to garbage collect the array entry

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Question at position 2 Why is an ArrayList's remove( ) slower than a LinkedList's remove( )?It has to move elementsIt creates a new ArrayList on the heapIt converts the data to a LinkedList firstIt has to garbage collect the array entry

BlackTom AI · Accepted Answer

Consider the question about why removing from an ArrayList can be slower than removing from a LinkedList. 
Option 1: It has to move elements. This is true because an ArrayList stores elements contiguously in an array; when you remove an element at a given index, all subsequent elements must be shifted left to fill the gap, which takes time proportional to the number of elements after the removed one. This shifting is the main cause of the slower removal operation in an ArrayList relative to a LinkedList. 
Option 2: It creates a new ArrayList on the heap. In typical implementations of ArrayList, a remove operation does not allocate a new ArrayList instance or copy all elements into a new collection; the operation works in place by shifting elements. Therefore this statement is inaccurate. 
Option 3: It converts the data to a LinkedList first. There is no automatic conversion from ArrayList to LinkedList during a remove; a LinkedList is a different data structure, and a removal in ArrayList does not involve converting the data to a LinkedList. Hence this is false. 
Option 4: It has to garbage collect the array entry. Removing an element may leave a slot unused, but the removal itself does not inherently trigger garbage collection of that array entry in a meaningful, direct way; GC behavior is not part of the remove operation’s mechanical cost. Therefore this claim misrepresents how GC interacts with a single removal. 
Overall, the most accurate explanation centers on the need to move elements after the removed position, which explains the relative slowness of ArrayList removals compared to LinkedList removals.

Question at position 2 Why is an ArrayList's remove( ) slower than a LinkedList's remove( )?It has to move elementsIt creates a new ArrayList on the heapIt converts the data to a LinkedList firstIt has to garbage collect the array entry

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Question at position 2 Why is an ArrayList's remove( ) slower than a LinkedList's remove( )?It has to move elementsIt creates a new ArrayList on the heapIt converts the data to a LinkedList firstIt has to garbage collect the array entry

View Explanation

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