Java Map

gistfile1.java

import java.util.*;

public class Main {

	public static class Map {

		public static interface Fn<IN, OUT> {

			public OUT call(final IN in);
		}

		public static <IN, OUT> List<OUT> map(
				List<IN> xs,
				Fn<IN, OUT> fn) {

			final List<OUT> ys = new LinkedList<OUT>();

			for (final IN x : xs) {

				ys.add(fn.call(x));
			}

			return ys;
		}
	}

	public static void main(String[] args) {

		List<Integer> xs = new LinkedList<Integer>();
		for (int i = 0; i < 10; ++i) xs.add(i);

		List<Character> ys = Map.map(xs, new Map.Fn<Integer, Character>() {

			public Character call(final Integer x) {

				return new Character((char)('A' + x.intValue()));
			}
		});

		for (final Character y : ys) { System.out.println(y); }
	}
}