How to transform List to another List [duplicate]

Answer 1

public static  List transform(List fromList,
                                      Function function

You might want to read up the API docs for Lists.transform() and Function, but basically the caller of the transform provides a Function object that converts an F to a T.

For example if you have a List intList and you want to create a List such that each element of the latter contains the english representation of that number (1 becomes "one" etc) and you have a access to a class such as IntToEnglish then

Function intToEnglish = 
    new Function() { 
        public String apply(Integer i) { return new IntToEnglish().english_number(i); }
    };

List wordsList = Lists.transform(intList, intToEnglish);

Does that conversion.

You can apply the same pattern to transform your List to List