/* * @(#)WildcardType.java	1.6 05/11/17 * * Copyright 2006 Sun Microsystems, Inc.  All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL.  Use is subject to license terms. */package com.sun.mirror.type;import java.util.Collection;/** * Represents a wildcard type argument. * Examples include:	<pre><tt> *   ? *   ? extends Number *   ? super T * </tt></pre> * * <p> A wildcard may have its upper bound explicitly set by an * <tt>extends</tt> clause, its lower bound explicitly set by a * <tt>super</tt> clause, or neither (but not both). * * @author Joseph D. Darcy * @author Scott Seligman * @version 1.6 05/11/17 * @since 1.5 */public interface WildcardType extends TypeMirror {    /**     * Returns the upper bounds of this wildcard.     * If no upper bound is explicitly declared, then     * an empty collection is returned.     *     * @return the upper bounds of this wildcard     */    Collection<ReferenceType> getUpperBounds();    /**     * Returns the lower bounds of this wildcard.     * If no lower bound is explicitly declared, then     * an empty collection is returned.     *     * @return the lower bounds of this wildcard     */    Collection<ReferenceType> getLowerBounds();}