Processing 1.0 - Processing Discourse - int and float in collections

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int and float in collections (Read 691 times)

zai

int and float in collections
May 25^th, 2005, 6:46am

Since Java collections stores objects, I would have to make ints and floats into Integer and Float before putting them into, say, a linked list right?

It seems a little convoluted and I'm just wondering if the creation of the new objects would create inefficiencies. Is there a simple way around this? Or would the resultant bytecode generated by Processing be optimized anyway.

e.g.
ArrayList al;
al.add(new Integer(i));
LinkedList ll;
ll.addFirst(new Float(f));

fry

Re: int and float in collections
Reply #1 - May 25^th, 2005, 5:16pm

it's going to be really inefficient to use the objects, and create lots of temporary objects like that. that's one of the things with java that tends to make programs slow.

if you just need a list of ints or floats, you're better off using just an array and keeping track of the count:

Code:


int xcount;
float x[] = new float[10];

void add(float what) {
  if (xcount == x.length) {
    x = expand(x, xcount * 2);
  }
  x[xcount++] = what;
}

then when using them:

for (int i = 0; i < xcount; i++) {
  // do something with x[i]
}

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