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

查看解析

登录即可查看完整答案

类似问题

What statement accurately describes the difference between a list and a dictionary?

A data structure is a simple unit that consists of one chunk of data only.

A data structure, such as a tuple, list or dictionary, controls the flow of logic in a module?

Sorted arrays and binary search trees can both be used as a dictionary data structure. Suppose that a dictionary is required to store n items that will be inserted in a randomized order. Which statement is not correct?

In a Queue ADT, which operation removes an element from the Queue?

Which of the following operations is not typically associated with a Stack ADT?

MutableMapping class provides concrete implementations for all behaviors other than the first five outlined earlier: 1._______ 2._______, 3.delitem, 4.len, and 5.iter. 2 essential methods are missing from this ADT, rest are there. Fill in the missing methods by selecting one of the choices.

Which of the following operations is not part of the Dictionary ADT?

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希望你的学习变得更简单

MutableMapping class provides concrete implementations for all behaviors other than the first five outlined earlier: 1._ 2._, 3.delitem, 4.len, and 5.iter. 2 essential methods are missing from this ADT, rest are there. Fill in the missing methods by selecting one of the choices.