You will have to forgive me for asking this but I can't seem to find the exact answer to my question. I need to know how to copy this list:
List<String> jpmcRouting
into a new List (the name doesn't matter).
I have found answers on copying an ArrayList but not a standard list. I've tried a lot of solutions but nothing seems to work. I would appreciate any help!
List<String> myCopy = new ArrayList<String>(jpmcRouting);
does the job. Collections.copy is not what you want; that only works if the destination list already has the right number of elements.
I could be wrong, but I think Collections.copy(b, a); will do the trick.
Do this:
List<String> b = new ArrayList<String>(jpmcRouting.size());
Collections.copy(b, jpmcRouting);
IndexOutOfBoundsException at runtime unless the original list is empty, meaning it will basically never work.The simplest way for me is:
List<String> copy = jpmcRouting.stream().collect(Collectors.toList());
if your result doesnt depend on order of elements in list, you can use
List<String> copy = jpmcRouting.parallelStream().collect(Collectors.toList());
it will work mutch faster, but it can change order of elements
Listare you trying to copy? Do you want the result to have the same class as the original?