1 /* 2 * Copyright (c) 2003, 2004, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package java.lang.reflect; 27 28 /** 29 * WildcardType represents a wildcard type expression, such as 30 * {@code ?}, {@code ? extends Number}, or {@code ? super Integer}. 31 * 32 * @since 1.5 33 */ 34 public interface WildcardType extends Type { 35 /** 36 * Returns an array of {@code Type} objects representing the upper 37 * bound(s) of this type variable. Note that if no upper bound is 38 * explicitly declared, the upper bound is {@code Object}. 39 * 40 * <p>For each upper bound B : 41 * <ul> 42 * <li>if B is a parameterized type or a type variable, it is created, 43 * (see {@link java.lang.reflect.ParameterizedType ParameterizedType} 44 * for the details of the creation process for parameterized types). 45 * <li>Otherwise, B is resolved. 46 * </ul> 47 * 48 * @return an array of Types representing the upper bound(s) of this 49 * type variable 50 * @throws TypeNotPresentException if any of the 51 * bounds refers to a non-existent type declaration 52 * @throws MalformedParameterizedTypeException if any of the 53 * bounds refer to a parameterized type that cannot be instantiated 54 * for any reason 55 */ getUpperBounds()56 Type[] getUpperBounds(); 57 58 /** 59 * Returns an array of {@code Type} objects representing the 60 * lower bound(s) of this type variable. Note that if no lower bound is 61 * explicitly declared, the lower bound is the type of {@code null}. 62 * In this case, a zero length array is returned. 63 * 64 * <p>For each lower bound B : 65 * <ul> 66 * <li>if B is a parameterized type or a type variable, it is created, 67 * (see {@link java.lang.reflect.ParameterizedType ParameterizedType} 68 * for the details of the creation process for parameterized types). 69 * <li>Otherwise, B is resolved. 70 * </ul> 71 * 72 * @return an array of Types representing the lower bound(s) of this 73 * type variable 74 * @throws TypeNotPresentException if any of the 75 * bounds refers to a non-existent type declaration 76 * @throws MalformedParameterizedTypeException if any of the 77 * bounds refer to a parameterized type that cannot be instantiated 78 * for any reason 79 */ getLowerBounds()80 Type[] getLowerBounds(); 81 // one or many? Up to language spec; currently only one, but this API 82 // allows for generalization. 83 } 84