How to put a billion objects in a sheet?

Question

Java

Good day to all.
I sit torturing Java, in academic interests.
Faced with the fact that when trying to put a billion numbers in a sheet, I encounter:

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space

The code itself is simple.

public class billion {
    public static void main(String[] args){
        ArrayList<Long> s = new ArrayList<Long>(1000000000);
        for(long  i = 0; i< 1000000000;i++){
            s.add(i);
        }

        s.toString();
    }
}

Please tell me what needs to be corrected in the JVM in order to execute this code? IntelIdea Runtime.

Answer 1

You just need at least 64 gigabytes of free RAM (if I counted everything correctly), but in fact four times more, since we store not primitives, but objects. Therefore, if you own such memory, then the keys for java -Xms128G -Xmx128G

Answer 2

Above are the correct answers. But why do you need such a list? Usually it is beaten into subsets and work already with them. Try changing the algorithm like this

Answer 3

https://habr.com/en/post/312078/
read this article. Do not put the computer in an uncomfortable position. It is better to write the algorithm in such a way that it comes from the available resources.