How to lowercase every element of a collection efficiently?

Question

What\'s the most efficient way to lower case every element of a List or Set?

My idea for a List:

final List strings = new ArrayList<         


        

Answer 1

You can do this with Google Collections:

    Collection lowerCaseStrings = Collections2.transform(strings,
        new Function() {
            public String apply(String str) {
                return str.toLowerCase();
            }
        }
    );