Wednesday, November 23, 2005

Concise Java Collection Syntax with varargs

Here's some utility methods that makes declaring and initializing Collections in Java 5 more concise. Note that this does not make sense to use for Collections that contain a lot of items. Here's the utility methods.

public static <T> List<T> newArrayList(T... elems) {
List<t> newList = new ArrayList<T>(elems.length);
fillCollection(newList, elems);
return newList;

public static <T> List<T> newLinkedList(T... elems) {
List<T> newList = new LinkedList<T>(elems.length);
fillCollection(newList, elems);
return newList;

private static <T> void fillCollection(Collection<T> coll, T... elems) {
for (T elem : elems) {


So code that looked like this before:

List<String> programmingLanguages = new ArrayList<String>(3);

Now looks like this:

List<String> programmingLanguages = CollectionUtils.newList(
"Java", "C++", "Ruby");


Blogger Francis Freeman said...

Just the same as

December 2, 2005 at 11:42 AM  
Blogger Rob Smith said...

Good catch. I was not aware that this method was changed in Java 5 to accept a vararg argument. Thanks!

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