Why ArrayList cannot store color in processing?

Question

List<color> cr = new ArrayList<color>();

Why does the above code show me Error on Dimensions?

Without knowing what you want to do, or without having at least a snippet of runnable code, it's hard to help. The question becomes too broad to answer. It seems like ArrayList accepts objects only, and colour is not a valid one. I would suggest you create a class, with inside an object that has all the values you need to store in the ArrayList and use that instead as the ArrayList object! — Niccolò Granieri
– Niccolò Granieri, Commented Jun 22, 2017 at 9:31
I want to initial a set of custom objects' color. I must create a new class instead of using the already existing datatype(color) in processing? — xinyue Liu
– xinyue Liu, Commented Jun 22, 2017 at 10:43
Exactly. If you have a look at this question, you'll see that a new class, with a new object is created to assign a different colour to every circle drawn on screen. Once you've tried, if you're still struggling, edit the question to make it less broad. — Niccolò Granieri
– Niccolò Granieri, Commented Jun 22, 2017 at 10:50

George Profenza · Accepted Answer · 2017-06-22 15:26:02Z

Use Integer instead of color:

import java.util.*; List<Integer> cr = new ArrayList<Integer>(); //populate list for(int i = 0 ; i < 100; i++){ cr.add(color(random(255),random(255),random(255))); } //retrieve values from list for(int i = 0 ; i < 100; i++){ fill(cr.get(i)); rect(i % 10 * 10, i / 10 * 10,10,10); }

Why ?

ArrayList can only reference types, not primitives. Integer is a class, not a primitive.

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