Examples of java.util.AbstractCollection

java.util.AbstractCollection
This class provides a skeletal implementation of the Collection interface, to minimize the effort required to implement this interface.
To implement an unmodifiable collection, the programmer needs only to extend this class and provide implementations for the iterator and size methods. (The iterator returned by the iterator method must implement hasNext and next.)
To implement a modifiable collection, the programmer must additionally override this class's add method (which otherwise throws an UnsupportedOperationException), and the iterator returned by the iterator method must additionally implement its remove method.
The programmer should generally provide a void (no argument) and Collection constructor, as per the recommendation in the Collection interface specification.
The documentation for each non-abstract method in this class describes its implementation in detail. Each of these methods may be overridden if the collection being implemented admits a more efficient implementation.
This class is a member of the Java Collections Framework. @author Josh Bloch @author Neal Gafter @version 1.38, 06/16/06 @see Collection @since 1.2

    map.clear();
    lst.clear();
  }


  public Collection values() {
    return new AbstractCollection() {
      public int size() {
        return map.size();
      }
      public boolean contains(Object value) {
        return map.containsValue(value);

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    return out;
  }


  public Collection values() {
    return new AbstractCollection() {
      public Iterator iterator() {
        return valueIterator();
      }


      public int size() {

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        return out;
    }


    public Collection values() {
        return new AbstractCollection() {
            public Iterator iterator() {
                return valueIterator();
            }


            public int size() {

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     */
    public Collection values() {
        // delegates to entrySet, because super method returns
        // WeakValues instead of value objects
  if (values == null) {
      values = new AbstractCollection() {
    public Iterator iterator() {
        return new Iterator() {
      private Iterator i = entrySet().iterator();


      public boolean hasNext() {

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     * @return a collection view of the values contained in this map.
     */
    public Collection valuesByValue() {


        if (collectionOfValues[VALUE] == null) {
            collectionOfValues[VALUE] = new AbstractCollection() {


                public Iterator iterator() {


                    return new DoubleOrderedMapIterator(VALUE) {

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     * @return a collection view of the values contained in this map.
     */
    public Collection values() {


        if (collectionOfValues[KEY] == null) {
            collectionOfValues[KEY] = new AbstractCollection() {


                public Iterator iterator() {


                    return new DoubleOrderedMapIterator(KEY) {

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    /**
     *  Implements {@link Map#values()}.
     */
    public Collection values() {
        return new AbstractCollection() {
            // required impl
            public Iterator iterator() {
                return new OrderedIterator(VALUE);
            }
            public boolean remove(Object value) {

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     *
     *  @return a collection view of this map's values.
     */
    public Collection values() {
        if (values != null) return values;
        values = new AbstractCollection()  {
            public int size() {
                return ReferenceMap.this.size();
            }


            public void clear() {

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        list = getList();
        assertEquals("List shouldn't equal String", false, list.equals(""));
        verify();


        final List listForC = Arrays.asList(getFullElements());
        Collection c = new AbstractCollection() {
            public int size() {
                return listForC.size();
            }


            public Iterator iterator() {

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    };
  }


  // per Map.values()
  public Collection values() {
    return new AbstractCollection() {
      // required impl
      public Iterator iterator() { return new OrderedIterator(VALUE); }
      public boolean remove(Object value) {
        // do null comparison outside loop so we only need to do it once.  This
        // provides a tighter, more efficient loop at the expense of slight

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