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Java Programming help

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Last Modified: 2012-05-10
I'm trying to understand a java program that looks like followin:


interface Filter<T> {
    boolean matches(T t);
}
public class Test{
    Filter<Set<Set<Integer>>> filter = new Filter<Set<Set<Integer>>>() {
        public boolean matches(Set<Set<Integer>> integers) {
            Set<Integer> union = new LinkedHashSet<Integer>();
            for (Set<Integer> ints : integers)
                union.addAll(ints);
            return union.equals(solutionSet);
        }
    };

}

why does the code have filter interface at the top and inside the method declaration one of the parenthesis ends with semicolon..is that correct?
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