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

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

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

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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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  @Override
  public Collection values() {
    if (values != null) {
      return values;
    }
    values = new AbstractCollection() {
      @Override
      public int size() {
        return size;
      }

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   * @return a collection view of the values contained in this map.
   */
  @Override
  public Collection values() {
    if (values == null) {
      values = new AbstractCollection() {
        @Override
        public Iterator iterator() {
          return new IntHashIterator(VALUES);
        }

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