How to store 2D Array coordinates in a list in java

Question

Question is kind of hard to ask. I'll try my best to explain it.

I have a 2D array that is a grid. This grid has its contents filled with 0 and 1.

I want to store in a list the coordinates of the array that only have 0. How would you do that?

For example: the coordinate location 2, 3 has the value of 0. How should one go about storing the 2, 3?

by "list" do you mean a java.util.List, or a one-dimensional array? — jcomeau_ictx
– jcomeau_ictx, Commented Apr 18, 2011 at 1:41

duffymo · Accepted Answer · 2011-04-18 01:41:40Z

5

Create a Point class that has coordinates (x,y) and the value 0 or 1. Store a List<Point> and you're all set.

answered Apr 18, 2011 at 1:41

duffymo

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3 Comments

abc123 Over a year ago

THANK YOU, wow I feel stupid. I've been using point all this time and didn't realize I should do it that way...

corsiKa Over a year ago

As a side note, I find that having a Map<Point,SomeValue> works a lot better than a SomeValue[]. Three reasons: 1) Separation from 0. 2) Negative coords. 3) Non-rectangular grids (Think shaped like Utah) don't waste tons of space.

Andrew Thompson Over a year ago

@abc123 If duffymo's reply answered your question, please mark it correct.

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