Hi!

I tried to append an array with a new object, but unfortunately it didn't work:


void setup() {
 size(400, 400);

 a = new test[0];
}

test[] a;

void draw() {
 a = append(a, new test());
}

class test {
 float x;
 test() {
   x = 3.11;
 }
}


Why does this piece of code not work?

controller

If you're interested, Java has 2 mutable structures for storing object references:ArrayList and Vector. Here's a simple Vector implementation.
The only complicated part is having to cast returned Object object references back to their original type:
e.g (Test)a.get(i)

To get at the property, you need some more parentheses:
((Test)a.get(i)).x

Here's your example (kind of) converted. You had coded an infinite loop, using draw(), which I took the liberty of removing.

Vector a = new Vector();
void setup() {
 for (int i =0; i<10; i++){
   a.add(new Test());
   println(((Test)a.get(i)).x);
 }
 println(a.size());
}

class Test {
 float x;
 Test() {
   x = 3.11;
 }
}