gistfile1.java

interface Function1<T1, R> {
        public R apply(T1 v);
}

public class Functional {
        public static void main(String[] args) {
                Integer[] i = {1, 2, 3, 4};
                foreach(new Function1<Integer, Object>() {
                        public Object apply(Integer v) {
                                System.out.println("" + v);
                                return null;
                        }
                }, i);
        }

        private static <T> void foreach(Function1<T, Object> fun, T[] values) {
                for(T o: values) {
                        fun.apply(o);
                }
        }
}