CODEWITHSUNDEEP
javaarraylist
Bryan Ho
Bryan Ho

Reputation: 13

Maximum size of Java arrayList containing Points

What is the maximum number of elements an ArrayList of Points can store?

In other words, given this code:

ArrayList<Point> x = new ArrayList<>();
for (int i = 0; i < maxElements; i++) {
    x.add(new Point(0, 0));
}

what is the maximum allowed value for maxElements (given enough heap space) such that x.get(0) is the correct value and is accessible?

Upvotes: 0

Views: 6419

Answers (4)

Absurd-Mind
Absurd-Mind

Reputation: 7994

Integer.MAX_VALUE - 8

Since this is the maximum size of an ArrayList

Source: Line 191

Upvotes: 2

talex
talex

Reputation: 20534

Theoretically is 2^31, but practically it is depend on how mach memory do you have.

Upvotes: 0

Kumar Abhinav
Kumar Abhinav

Reputation: 6675

What is the maximum number of elements an ArrayList of Points can store?

ArrayList and Points are Objects and are stored in heap memory.If the heap memory can support,it can store a maximum of Integer.MAX_VALUE(2^31-1) but you may get java.lang.OutOfMemoryError before that.

What is the value of maxElements such that x.get(0) is the correct value and is accessible?

maxElements can have any value grater than equal to 1(so that it contains at least 1 element)

Upvotes: 0

user2173738
user2173738

Reputation:

The maxElements could be a limit for the list. You can use x.size() > 0 check if you want x.get(0).

ArrayList<Points> x = new ArrayList<>();
for (int i = 0; i < maxElements; i++) {
    x.add(new Point(0, 0));
}
Points p;
if (x.size() > 0)
  p = x.get(0);

Upvotes: 0

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