Maximum Size of Array?

import java.util.*;

public class Main {
    private static ArrayList<SomePoint> _points = new ArrayList<SomePoint>();

    private static class SomePoint {
        private long x;
        private long y;
        private long z;

        public SomePoint() {
            x = 0;
            y = 0;
            z = 0;
        }
        public long getX()
            {return this.x;}
        public long getY()
            {return this.y;}
        public long getZ()
            {return this.z;}
        public void setPoint(long x, long y, long z)
        {
            this.x = x;
            this.y = y;
            this.z = z;
        }
    }


    public Main() {
     }

    public static void main(String[] args) {
             //Add 1000 default points
        for (int x=0; x<1000; x++)
        {
            _points.add(new SomePoint());
        }
        
        //Dump the points collection to the output
        for (SomePoint item : _points)
        {
            System.out.println("x:" + item.getX() + " y:" + item.getY() + " z:" + item.getZ());
        }
    }

long[,]contourArray = new long[1000,3];