collection.java

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     * @throws IllegalArgumentException some aspect of this element prevents
     *         it from being added to this collection.
     */
    boolean add(Object o);

    /**
     * Removes a single instance of the specified element from this
     * collection, if it is present (optional operation).  More formally,
     * removes an element <tt>e</tt> such that <tt>(o==null ?  e==null :
     * o.equals(e))</tt>, if this collection contains one or more such
     * elements.  Returns true if this collection contained the specified
     * element (or equivalently, if this collection changed as a result of the
     * call).
     *
     * @param o element to be removed from this collection, if present.
     * @return <tt>true</tt> if this collection changed as a result of the
     *         call
     * 
     * @throws ClassCastException if the type of the specified element
     * 	       is incompatible with this collection (optional).
     * @throws NullPointerException if the specified element is null and this
     *         collection does not support null elements (optional).
     * @throws UnsupportedOperationException remove is not supported by this
     *         collection.
     */
    boolean remove(Object o);


    // Bulk Operations

    /**
     * Returns <tt>true</tt> if this collection contains all of the elements
     * in the specified collection.
     *
     * @param  c collection to be checked for containment in this collection.
     * @return <tt>true</tt> if this collection contains all of the elements
     *	       in the specified collection
     * @throws ClassCastException if the types of one or more elements
     *         in the specified collection are incompatible with this
     *         collection (optional).
     * @throws NullPointerException if the specified collection contains one
     *         or more null elements and this collection does not support null
     *         elements (optional).
     * @throws NullPointerException if the specified collection is
     *         <tt>null</tt>.
     * @see    #contains(Object)
     */
    boolean containsAll(Collection c);

    /**
     * Adds all of the elements in the specified collection to this collection
     * (optional operation).  The behavior of this operation is undefined if
     * the specified collection is modified while the operation is in progress.
     * (This implies that the behavior of this call is undefined if the
     * specified collection is this collection, and this collection is
     * nonempty.)
     *
     * @param c elements to be inserted into this collection.
     * @return <tt>true</tt> if this collection changed as a result of the
     *         call
     * 
     * @throws UnsupportedOperationException if this collection does not
     *         support the <tt>addAll</tt> method.
     * @throws ClassCastException if the class of an element of the specified
     * 	       collection prevents it from being added to this collection.
     * @throws NullPointerException if the specified collection contains one
     *         or more null elements and this collection does not support null
     *         elements, or if the specified collection is <tt>null</tt>.
     * @throws IllegalArgumentException some aspect of an element of the
     *	       specified collection prevents it from being added to this
     *	       collection.
     * @see #add(Object)
     */
    boolean addAll(Collection c);

    /**
     * 
     * Removes all this collection's elements that are also contained in the
     * specified collection (optional operation).  After this call returns,
     * this collection will contain no elements in common with the specified
     * collection.
     *
     * @param c elements to be removed from this collection.
     * @return <tt>true</tt> if this collection changed as a result of the
     *         call
     * 
     * @throws UnsupportedOperationException if the <tt>removeAll</tt> method
     * 	       is not supported by this collection.
     * @throws ClassCastException if the types of one or more elements
     *         in this collection are incompatible with the specified
     *         collection (optional).
     * @throws NullPointerException if this collection contains one or more
     *         null elements and the specified collection does not support
     *         null elements (optional).
     * @throws NullPointerException if the specified collection is
     *         <tt>null</tt>.
     * @see #remove(Object)
     * @see #contains(Object)
     */
    boolean removeAll(Collection c);

    /**
     * Retains only the elements in this collection that are contained in the
     * specified collection (optional operation).  In other words, removes from
     * this collection all of its elements that are not contained in the
     * specified collection.
     *
     * @param c elements to be retained in this collection.
     * @return <tt>true</tt> if this collection changed as a result of the
     *         call
     * 
     * @throws UnsupportedOperationException if the <tt>retainAll</tt> method
     * 	       is not supported by this Collection.
     * @throws ClassCastException if the types of one or more elements
     *         in this collection are incompatible with the specified
     *         collection (optional).
     * @throws NullPointerException if this collection contains one or more
     *         null elements and the specified collection does not support null 
     *         elements (optional).
     * @throws NullPointerException if the specified collection is
     *         <tt>null</tt>.
     * @see #remove(Object)
     * @see #contains(Object)
     */
    boolean retainAll(Collection c);

    /**
     * Removes all of the elements from this collection (optional operation).
     * This collection will be empty after this method returns unless it
     * throws an exception.
     *
     * @throws UnsupportedOperationException if the <tt>clear</tt> method is
     *         not supported by this collection.
     */
    void clear();


    // Comparison and hashing

    /**
     * Compares the specified object with this collection for equality. <p>
     *
     * While the <tt>Collection</tt> interface adds no stipulations to the
     * general contract for the <tt>Object.equals</tt>, programmers who
     * implement the <tt>Collection</tt> interface "directly" (in other words,
     * create a class that is a <tt>Collection</tt> but is not a <tt>Set</tt>
     * or a <tt>List</tt>) must exercise care if they choose to override the
     * <tt>Object.equals</tt>.  It is not necessary to do so, and the simplest
     * course of action is to rely on <tt>Object</tt>'s implementation, but
     * the implementer may wish to implement a "value comparison" in place of
     * the default "reference comparison."  (The <tt>List</tt> and
     * <tt>Set</tt> interfaces mandate such value comparisons.)<p>
     *
     * The general contract for the <tt>Object.equals</tt> method states that
     * equals must be symmetric (in other words, <tt>a.equals(b)</tt> if and
     * only if <tt>b.equals(a)</tt>).  The contracts for <tt>List.equals</tt>
     * and <tt>Set.equals</tt> state that lists are only equal to other lists,
     * and sets to other sets.  Thus, a custom <tt>equals</tt> method for a
     * collection class that implements neither the <tt>List</tt> nor
     * <tt>Set</tt> interface must return <tt>false</tt> when this collection
     * is compared to any list or set.  (By the same logic, it is not possible
     * to write a class that correctly implements both the <tt>Set</tt> and
     * <tt>List</tt> interfaces.)
     *
     * @param o Object to be compared for equality with this collection.
     * @return <tt>true</tt> if the specified object is equal to this
     * collection
     * 
     * @see Object#equals(Object)
     * @see Set#equals(Object)
     * @see List#equals(Object)
     */
    boolean equals(Object o);

    /**
     * Returns the hash code value for this collection.  While the
     * <tt>Collection</tt> interface adds no stipulations to the general
     * contract for the <tt>Object.hashCode</tt> method, programmers should
     * take note that any class that overrides the <tt>Object.equals</tt>
     * method must also override the <tt>Object.hashCode</tt> method in order
     * to satisfy the general contract for the <tt>Object.hashCode</tt>method.
     * In particular, <tt>c1.equals(c2)</tt> implies that
     * <tt>c1.hashCode()==c2.hashCode()</tt>.
     *
     * @return the hash code value for this collection
     * 
     * @see Object#hashCode()
     * @see Object#equals(Object)
     */
    int hashCode();
}