Examples of org.apache.commons.collections15.Bag.retainAll()

org.apache.commons.collections15.Bag.retainAll()

(Violation) Remove any members of the bag that are not in the given collection, respecting cardinality. That is, if the given collection coll contains n copies of a given object and the bag has m > n copies, then delete m - n copies from the bag. In addition, if e is an object in the bag but !coll.contains(e), then remove e and any of its copies.

The {@link Collection#retainAll(Collection)} method specifiesthat cardinality should not be respected; this method should keep all occurrences of every object contained in the given collection. @param coll the collection to retain @return true if this call changed the collection

        bag.add("B");
        bag.add("C");
        List retains = new ArrayList();
        retains.add("B");
        retains.add("C");
        bag.retainAll(retains);
        assertEquals("Should have 2 total items", 2, bag.size());
    }


    public void testIterator() {
        Bag bag = makeBag();

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