Convert an Array objects to an Array of variables within that object

Question

Basically what I want to do is this:

Point[] points = new Point[]{new Point(2, 3), new Point(7,8), new Point(1, 8)};
int[] xCoords  = new int[points.length];

for (int i = 0; i < points.lenght; i++) {
    xCoords[i] = points[i].x;
}

So that in the end I would end up with xCoords looking like this:

{2, 7, 8}

Is it possible to archive this in a more general fashion?

First of all the result should be {2, 7, 1}

Theo
– Theo

2016-03-24 22:14:22 +00:00
Commented Mar 24, 2016 at 22:14 — Theo
– Theo, Commented Mar 24, 2016 at 22:14

Peter Lawrey · Accepted Answer · 2016-03-24 22:03:59Z

7

In java-8 you can do

int[] xCoords = Stream.of(points).mapToInt(p -> p.x).toArray();

answered Mar 24, 2016 at 22:03

Peter Lawrey

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2 Comments

Yassin Hajaj Over a year ago

Well, just for having used streams +1 :D

Busti Over a year ago

I KNEW it was possible using lambda functions!

Yassin Hajaj · Accepted Answer · 2016-03-24 22:04:07Z

5

If you're using java-8

int[] xCoords = Stream.of(points).mapToInt(Point::getX).toArray();

answered Mar 24, 2016 at 22:04

Yassin Hajaj

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2 Comments

Busti Over a year ago

Thank you very much! Now it just depends on which of the two options is more efficient, but I guess it just comes down to styling.

Yassin Hajaj Over a year ago

@Busti Both solutions work. It depends on the level of encapsulation :).

Darshan Mehta · Accepted Answer · 2016-03-24 22:04:42Z

4

You can do it by using a 2D array, e.g:

int[][] coordinates = new int[5][];
for(int i=0 ; i < points.size() ; i++){
    coordinates[i] = new int[]{points.get(i).getX(), points.get(i).getY()};
}

answered Mar 24, 2016 at 22:04

Darshan Mehta

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