Playing around with Java lambdas.

Collections8.java

import java.util.*;
import java.util.function.Predicate;
import java.util.function.Consumer;

public class Collections8 {
        public static void main(String[] args) {
                List<String> names = Arrays.asList("Alice", "Bob", "Charlie");
                forEach(filter(names, e -> e.length() > 4), e -> { System.out.println(e); });
                //names.filter().forEach(e -> { System.out.println(e); });
        }

        private static <T> List<T> filter(List<T> list, Predicate<T> p) {
          List<T> buf = new ArrayList<T>();
        	for (T e : list) {
        		if (p.test(e))
        			buf.add(e);
        	}
        	return buf;
        }

        private static <T> void forEach(List<T> list, Consumer<T> f) {
        	for (T e : list) {
        		f.accept(e);
        	}
        }
}