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1  Game Development / Performance Tuning / Re: clearing or make new array? on: 2014-06-02 03:06:24
Ugh, this sounds exactly like an Object Pool to me. But, then you wouldn't need to delete the Objects, instead, you would just set them to a value that you wouldn't use so they can be used again. Below is an implementation for objects (not written by me but borrowed...)

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    /**
     * Acquires an object from the pool, if a recycled one is available, then
     * the pool will return the recycled one rather than creating a new one.
     *
     * @return object instance
     */

    public final T acquireObject()
    {
        if( collectedTrash.size() > 0 )
            return collectedTrash.remove(0);
        else
            return createInstance();
    }


You realise when you call collectedTrash.remove(0) you're causing the entire backing array of ArrayList to be copied 1 place to the left?  If it's large you're probably costing yourself a lot more than you gain from eliminating GC.  Better off using a LinkedList or collectedTrash.remove(collectedTrash.size() - 1).

edit:  Don't use a LinkedList because that will create another wrapper object which will get GC'd in place of the pooled object.
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