Ugly fake Java Lambdas

FakeLambda.java

package helpers;

import java.util.ArrayList;
import java.util.List;

/**
 * @author Wes Lanning
 * @version 2013-08-01
 */
public class FakeLambda
{
    public interface ƛƛ<A, B>
    {
        B apply(A a);
    }

    public interface ƛ<A>
    {
        void apply(A a);
    }

    public static <A> List<A> filter(Iterable<A> data, ƛƛ<A, Boolean> predicate)
    {
        List<A> result = new ArrayList<>();

        for (A a : data) {
            if (predicate.apply(a)) result.add(a);
        }
        return result;
    }

    public static <A> List<A> map(Iterable<A> data, ƛƛ<A, A> funct) {
        List<A> result = new ArrayList<>();

        for (A a : data) {
            result.add(funct.apply(a));
        }
        return result;
    }

    public static <A> void foreach(Iterable<A> data, ƛ<A> funct) {
        for (A a : data) {
            funct.apply(a);
        }
    }

    public static List<String> filterData(List<String> data)
    {
        return filter(data, new ƛƛ<String, Boolean>() {
            public Boolean apply(String elem) {
                return !elem.isEmpty();
            }
        });
    }

    public static List<String> mapData(List<String> data)
    {
        return map(data, new ƛƛ<String, String>() {
            public String apply(String elem) {
                return String.format("-- %s --", elem);
            }
        });
    }

    public static void formatData(List<String> data)
    {
        foreach(data, new ƛ<String>() {
            public void apply(String elem) {
                System.out.format("** %s **", elem);
            }
        });
    }
}