This might be space efficient but sometimes costs performance issues when the Garbage Collector ends up doing some work to free up a necessary contiguous block of memory in a heap. But since the memory needed for each node might not be contiguous, LinkedList won’t result in any major performance issues.ĪrrayList, however, needs a contiguous block of memory in a heap for allocating the dynamic array. LinkedList comes up with memory overhead since every element is a node object which stores pointers to the next and previous elements. On the other hand, a LinkedList’s capacity is exactly equal to the list size, and we cannot specify the capacity during the list initialization. Since resizing degrades performance, it is always better to specify the initial capacity of the ArrayList during initialization itself. Its default capacity is just 10 elements. CapacityĪn ArrayList’s capacity at least as large as the list size, and it grows automatically as more elements are added to it. ArrayList is a resizable-array implementation, whereas LinkedList is a Doubly-linked list implementation of the List interface. Underlying Data Structureīoth ArrayList and LinkedList are two different implementations of the List interface. This post will discuss differences between the ArrayList and LinkedList in Java.
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