whats wrong with this code? It is not filtering the collection!

public class CollectionsFilter {

    public static void main(String[] args) {
        List<Integer> list = Arrays.asList(new Integer[] { 1, 2, 3, 4, 5, 6, 7,
                8, 9, 10 });
        Collection<Integer> evenNumbers = Utils.filter(list,
                new Predicate<Integer>() {
                    public boolean apply(Integer i) {
                        if (i % 2 == 0) {
                            return true;
                        }
                        return false;
                    }
                });

        Collection<Integer> oddNumbers = Utils.filter(list,
                new Predicate<Integer>() {
                    public boolean apply(Integer i) {
                        if (i % 2 !开发者_运维技巧= 0) {
                            return true;
                        }
                        return false;
                    }
                });
        System.out.println("EVEN Numbers > " + evenNumbers);
        System.out.println("ODD Numbers > " + oddNumbers);
    }

}

where my Utils.filter() method is :

public static <T> Collection<T> filter(Collection<T> target,
            Predicate<T> predicate) {
        Collection<T> filteredCollection = new ArrayList<T>();
        for (T t : filteredCollection) {
            if (predicate.apply(t)) {
                filteredCollection.add(t);
            }
        }
        return filteredCollection;
    }

and the Prdicate:

public interface Predicate<T> {
    public boolean apply(T type);
}

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First of all, don't write this kind of code yourself. There's Google Collections for that.

Having said that: Try to iterate over target instead of over filteredCollection in your filter() method, that should fix it.

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That's because your Util.filter runs over empty filteredCollection which it creates in the beginning.