Maximum number of elements in an array in java

Question

How can I store more than 2^128 elements in an array in java.

I tried Integer.MAX_value but this is not the range I want. I want more numbers.

This is the ERROR in using (Integer.MAX_VALUE):

Exception in thread "main" java.lang.OutOfMemoryError: Requested array size exceeds VM limit.

Even if you could store them, do you have that much memory available for the VM.init ? — Michael Chourdakis, Jul 15 '19 at 07:55
"How can I store more than 2^128 elements in an array in java." - You can't. You will need to use a different data structure. — Stephen C, Jul 15 '19 at 08:51

score 0 · Answer 1 · answered Jul 15 '19 at 08:04

In Java, arrays internally use integers (int not Integer) for index, the max size is limited by the max size of integers. So theoretically it is 2^31-1 = 2147483647, which is Integer.MAX_VALUE.

But in recent HotSpot JVM it has been observed that the max size of array can be Integer.MAX_VALUE - 5.

Maximum number of elements in an array in java

1 Answers1