[java] How to pass an ArrayList to a varargs method parameter?

Basically I have an ArrayList of locations:

ArrayList<WorldLocation> locations = new ArrayList<WorldLocation>();

below this I call the following method:

.getMap();

the parameters in the getMap() method are:

getMap(WorldLocation... locations)

The problem I'm having is I'm not sure how to pass in the WHOLE list of locations into that method.

I've tried

.getMap(locations.toArray())

but getMap doesn't accept that because it doesn't accept Objects[].

Now if I use

.getMap(locations.get(0));

it will work perfectly... but I need to somehow pass in ALL of the locations... I could of course make keep adding locations.get(1), locations.get(2) etc. but the size of the array varies. I'm just not use to the whole concept of an ArrayList

What would be the easiest way to go about this? I feel like I'm just not thinking straight right now.

This question is related to java variadic-functions

The answer is


A shorter version of the accepted answer using Guava:

.getMap(Iterables.toArray(locations, WorldLocation.class));

can be shortened further by statically importing toArray:

import static com.google.common.collect.toArray;
// ...

    .getMap(toArray(locations, WorldLocation.class));

In Java 8:

List<WorldLocation> locations = new ArrayList<>();

.getMap(locations.stream().toArray(WorldLocation[]::new));

Though it is marked as resolved here my KOTLIN RESOLUTION

fun log(properties: Map<String, Any>) {
    val propertyPairsList = properties.map { Pair(it.key, it.value) }
    val bundle = bundleOf(*propertyPairsList.toTypedArray())
}

bundleOf has vararg parameter


You can do:

getMap(locations.toArray(new WorldLocation[locations.size()]));

or

getMap(locations.toArray(new WorldLocation[0]));

or

getMap(new WorldLocation[locations.size()]);

@SuppressWarnings("unchecked") is needed to remove the ide warning.