ArrayList LinkedList; 1) ArrayList internally uses a dynamic array to store the elements.: LinkedList internally uses a doubly linked list to store the elements.: 2) Manipulation with ArrayList is slow because it internally uses an array. If any element is removed from the array, all the bits are shifted in memory. You'll be able to invoke ArrayList-specific methods and use ArrayList-specific members in addition to those whose definitions are inherited from List. Nevertheless, when you call a method of a List interface in the first example, which was implemented in ArrayList, the method from ArrayList will be called. How can the answer be improved?

• Difference Between Array And Arraylist Python
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• Type List vs type ArrayList in Java 15 answers
• What is a List vs. an ArrayList? [duplicate] 6 answers

I've been using ArrayList recently in my android project at the office and I'm a bit confused between List and ArrayList, what is the difference of the two and what should I use?

Also I saw some implementations of it like.

What is the difference of those two instances?

marked as duplicate by Eric, Louis Wasserman, Matt Ball, A--C, Alex LockwoodFeb 15 '13 at 21:00

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1 Answer

There's no difference between list implementations in both of your examples.There's however a difference in a way you can further use variable myList in your code.

When you define your list as:

you can only call methods and reference members that are defined in the List interface.If you define it as:

you'll be able to invoke ArrayList-specific methods and use ArrayList-specific members in addition to those whose definitions are inherited from List.

Nevertheless, when you call a method of a List interface in the first example, which was implemented in ArrayList, the method from ArrayList will be called (because the List interface doesn't implement any methods).

That's called polymorphism. You can read up on it.

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Difference between Array and Array List in java include eight points namely Resizable, Performance, Traversal, Primitives, Length, Type-Safety, Adding elements, Multi-dimensional.

Resizable: Array is static in size; Array List is dynamic in size. Array is fixed length data structure; one cannot change the length after creating the Array object.

Each Array List object has instance variable capacity which indicates the size of the Array List. As elements are added to an Array List its capacity grows automatically.

Primitives: Array List cannot contain primitive data types (like int, float and double) it can only contain Object while Array can contain both primitive data types as well as objects.

Difference Between Array And Arraylist Python

One get a misconception that we can store primitives (int, float and double) in Array List, but it is not true

Iterating the values: We can use iterator to iterate through Array List. The iterators returned by the Array List class's iterator and listiterator method are fail-fast. We can use for loop or for each loop to iterate through array.

Difference Between Array And Arraylist Javatpoint

Multi-dimensional: Array can be multi dimensional, while Array List is always single dimensional.

Regards,

Anjali,