retainAll() vs. costum code thingy

[ClickerMonkey]

That code snippet was from memory, and was a little wrong... here's something correct with the adding code. I have many other things going on in my update logic but here's the bare bones:

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Entity[] entities = new Entity[32]; int size = 0; public void add( Entity e ) {    if ( size >= entities.length ) {       entities = Arrays.copyOf( entities, size + (size >> 1) ); // + 50%   }    entites[ size++ ] = e; } public void update( Entity e ) {    int alive = 0;    for (int i = 0; i < size; i++) {       Entity e = entities[i];       e.update();       if ( e.isActive() ) {          entities[ alive++ ] = e;       }    }    while ( size > alive ) {       entities[ --size ] = null;    }   // I also have downsizing logic where once I go down to X% free space I start keeping track of time,  // once I hit Y seconds I know I can safely downsize the array. Ideally you should know exactly the  // number of entities you want to cap it at so you don't have to resize or downsize. }

And yes, I've optimized this code because I always end up having thousands, often tens of thousands, sometimes a hundred thousand entities being managed at once...