From ArrayList to HashMap

In my plugin nanobot (that is a world editor plugin) i use a ArrayList to store all blocks that my plugin as scanned and then a HashSet to what coordinates that been scanned so i don't scan the same block twice. now i maybe need to add a other ArrayList for my new save format

I'm planing of useing HashMap<String,NanoMemmory> to see what blocks have been scanned and to save there information the only problem with that is the editing code i have then, now i just loop threw it

Code:

while(!isCompleted() && hasTimeLeft())
{
nanoMemmory.get(progress).run();
progress++;
}

hasTimeLeft() is a function that stops the loop for one one second after very 250ms so the server don't freeze or lags then the block are being edited the problem i have with using a HashMap is if would do that how do i start from where i left off? i can't remove the block after being scanned for some of them i need later i don't know about clone() and keep in mind that that HashMap could contain 500 000 blocks

 

Converting an arraylist to a hashmap is probably not a very good idea. Considering you are only holding 1 data type where a hashmap maps values to keys which requires 2 values.

 

but i have a HashSet with the exact same amount of elements the ArrayList

 

You said hashmap, not hashset. If it's a hashset then just iterate through the array list and add each component to the hashset

 

If it's a hashset, you should use Collections.copy() and DO NOT iterate.