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trimToSize[] method is used for memory optimization. It trims the capacity of ArrayList to the current list size. For e.g. An arraylist is having capacity of 15 but there are only 5 elements in it, calling trimToSize[] method on this ArrayList would change the capacity from 15 to 5.
public void trimToSize[]
Example
Here I have defined the ArrayList of capacity 50. After adding 10 elements I called trimToSize[] method which would have reduced the capacity from 50 to 10 [current size of arraylist].
Output:
[1, 2, 3, 4, 5, 6, 7, 1, 1, 1]
I was thinking about it. You may have access to endless memory [one computer with lot of RAM] so that you can keep on adding more and more elements to your ArrayList.
But, I think that you can only access elements BY INDEX up to a certain value of index. The maximum size of this index could be = maximum number your computer can represent, that is long 9,223,372,036,854,775,807 in Java.
I know that you can access the NEXT element using an iterator. But, how do i access elements after the [9,223,372,036,854,775,807]TH index, using an index number ?
The theoretical limit for ArrayList capacity is Integer. MAX_VALUE, a.k.a. 2^31 - 1, a.k.a. 2,147,483,647. But you'll probably get an OutOfMemoryError long before that time because, well, you run out of memory. An ArrayList containing 11 million references should be about 42MB, assuming a reference is 4 bytes long.
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Simply so, does ArrayList have a limit?
The size limit of ArrayList is Integer. MAX_VALUE since it's backed by an ordinary array. java. util.
Subsequently, question is, what is the maximum size of HashMap in Java? A HashMap instance will occupy 32 * SIZE + 4 * CAPACITY bytes, while the theoretical map size limit could be equal to 8 * SIZE bytes [2 arrays of keys and values with no space wasted].
In this regard, how do you define the size of an ArrayList in Java?
Size is equal to the number of elements contained in the ArrayList [and any other List implementation]. The capacity is just the length of the underlying array which is used to internaly store the elements of the ArrayList , and is always greater or equal to the size of the list.
How do you find the size of an ArrayList?
The size of an ArrayList can be obtained by using the java. util. ArrayList. size[] method as it returns the number of elements in the ArrayList i.e. the size.