Set交集

import java.util.HashSet;
import java.util.Iterator;

public class Main {

public static HashSet intersectionSet(HashSet setA,
        HashSet setB) {
    HashSet intersectionSet = new HashSet();
    Iterator iterA = setA.iterator();
    while (iterA.hasNext()) {
        String tempInner = iterA.next();
        if (setB.contains(tempInner)) {
            intersectionSet.add(tempInner);
        }
    }
    return intersectionSet;
}

}