1 /* |
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2 * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 |
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24 /* |
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25 * @test |
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26 * @bug 4916607 |
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27 * @summary Test casts (legal, warning, and errors) |
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28 * @author gafter |
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29 * |
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30 * @compile/fail -Werror -Xlint:unchecked CastWarn14.java |
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31 */ |
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32 |
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33 import java.util.*; |
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34 |
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35 class CastTest { |
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36 |
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37 // --- Directly transferring parameters --- |
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38 |
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39 private class AA<T> { } |
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40 |
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41 private class AB<T> extends AA<T> { } |
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42 private class AC<T> extends AA<Vector<T>> { } |
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43 private class AD<T> extends AA<Vector<? extends T>> { } |
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44 private class AE<T> extends AA<Vector<? super T>> { } |
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45 private class AF<T> extends AA<T[]> { } |
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46 private class AG<T> extends AA<String> { } |
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47 |
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48 private void parameterTransfer() { |
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49 Object o; |
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50 |
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51 o = (AB<String>) (AA<String>) null; // <<pass>> |
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52 o = (AB<String>) (AA<Number>) null; // <<fail 1>> |
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53 o = (AC<String>) (AA<Vector<String>>) null; // <<pass>> |
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54 o = (AC<String>) (AA<Vector<Number>>) null; // <<fail 2>> |
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55 o = (AC<String>) (AA<Stack<String>>) null; // <<fail 3>> |
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56 |
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57 o = (AD<Number>) (AA<Vector<? extends Number>>) null; // <<pass>> |
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58 o = (AD<String>) (AA<Vector<? extends Number>>) null; // <<fail 4>> |
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59 o = (AD<?>) (AA<Vector<? extends Object>>) null; // <<pass>> |
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60 o = (AD<Object>) (AA<Vector<?>>) null; // <<pass>> |
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61 |
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62 o = (AE<String>) (AA<Vector<? super String>>) null; // <<pass>> |
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63 o = (AE<Number>) (AA<Vector<? super String>>) null; // <<fail 5>> |
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64 |
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65 o = (AF<String>) (AA<String[]>) null; // <<pass>> |
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66 o = (AF<String>) (AA<Number[]>) null; // <<fail 6>> |
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67 |
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68 o = (AG<?>) (AA<String>) null; // <<pass>> |
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69 o = (AG<?>) (AA<Number>) null; // <<fail 7>> |
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70 } |
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71 |
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72 // --- Inconsistent matches --- |
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73 |
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74 private class BA<T> { } |
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75 private class BB<T, S> { } |
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76 |
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77 private class BC<T> extends BA<Integer> { } |
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78 private class BD<T> extends BB<T, T> { } |
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79 |
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80 private void inconsistentMatches() { |
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81 Object o; |
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82 |
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83 o = (BC<?>) (BA<Integer>) null; // <<pass>> |
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84 o = (BC<?>) (BA<String>) null; // <<fail 8>> |
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85 o = (BD<String>) (BB<String, String>) null; // <<pass>> |
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86 o = (BD<String>) (BB<String, Number>) null; // <<fail 9>> |
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87 o = (BD<String>) (BB<Number, String>) null; // <<fail 10>> |
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88 } |
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89 |
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90 private void whyMustEverythingBeSo_______Complicated() { |
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91 // This has to work... |
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92 BD<Number> bd = new BD<Number>(); |
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93 BB<? extends Number, ? super Integer> bb = bd; |
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94 // 4916620: wildcards: legal cast is rejected |
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95 // bd = (BD<Number>) bb; // <<warn>> <<todo: cast-infer>> |
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96 } |
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97 |
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98 // --- Transferring parameters via supertypes --- |
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99 |
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100 private interface CA<T> { } |
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101 private interface CB<T> extends CA<T> { } |
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102 private interface CC<T> extends CA<T> { } |
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103 |
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104 private class CD<T> implements CB<T> { } |
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105 private interface CE<T> extends CC<T> { } |
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106 |
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107 private interface CF<S> { } |
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108 private interface CG<T> { } |
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109 private class CH<S, T> implements CF<S>, CG<T> { } |
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110 private interface CI<S> extends CF<S> { } |
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111 private interface CJ<T> extends CG<T> { } |
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112 private interface CK<S, T> extends CI<S>, CJ<T> { } |
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113 |
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114 private void supertypeParameterTransfer() { |
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115 Object o; |
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116 CD<?> cd = (CE<?>) null; // <<fail 11>> |
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117 CE<?> ce = (CD<?>) null; // <<fail 12>> |
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118 o = (CE<String>) (CD<String>) null; // <<pass>> |
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119 o = (CE<Number>) (CD<String>) null; // <<fail 13>> |
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120 |
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121 // 4916622: unnecessary warning with cast |
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122 // o = (CH<String, Integer>) (CK<String, Integer>) null; // <<pass>> <<todo: cast-infer>> |
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123 } |
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124 |
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125 // --- Disjoint --- |
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126 |
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127 private interface DA<T> { } |
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128 private interface DB<T> extends DA<T> { } |
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129 private interface DC<T> extends DA<Integer> { } |
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130 |
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131 private <N extends Number, I extends Integer, R extends Runnable, S extends String> void disjointness() { |
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132 Object o; |
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133 |
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134 // Classes |
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135 o = (DA<Number>) (DA<Integer>) null; // <<fail 14>> |
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136 o = (DA<? extends Number>) (DA<Integer>) null; // <<pass>> |
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137 o = (DA<? extends Integer>) (DA<Number>) null; // <<fail 15>> |
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138 o = (DA<? super Integer>) (DA<Number>) null; // <<pass>> |
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139 o = (DA<? super Number>) (DA<Integer>) null; // <<fail 16>> |
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140 o = (DA<?>) (DA<Integer>) null; // <<pass>> |
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141 |
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142 o = (DA<? extends Runnable>) (DA<? extends Number>) null; // <<warn 2>> |
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143 o = (DA<? extends Runnable>) (DA<? extends String>) null; // <<fail 17>> |
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144 |
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145 o = (DA<? super Integer>) (DA<? extends Number>) null; // <<warn 3>> |
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146 o = (DA<? super Number>) (DA<? extends Integer>) null; // <<fail 18>> |
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147 o = (DA<?>) (DA<? extends Integer>) null; // <<pass>> |
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148 |
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149 o = (DA<? super String>) (DA<? super Number>) null; // <<warn 4>> |
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150 o = (DA<?>) (DA<? super String>) null; // <<pass>> |
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151 |
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152 o = (DA<?>) (DA<?>) null; // <<pass>> |
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153 |
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154 // Typevars |
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155 o = (DA<? extends Number>) (DA<I>) null; // <<pass>> |
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156 o = (DA<? extends Integer>) (DA<N>) null; // <<warn 5>> |
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157 o = (DA<? extends String>) (DA<I>) null; // <<fail 19>> |
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158 |
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159 o = (DA<I>) (DA<? extends Number>) null; // <<warn 6>> |
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160 o = (DA<N>) (DA<? extends Integer>) null; // <<warn 7>> |
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161 o = (DA<N>) (DA<? extends Runnable>) null; // <<warn 8>> |
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162 |
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163 o = (DA<N>) (DA<I>) null; // <<warn 9>> |
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164 o = (DA<N>) (DA<R>) null; // <<warn 10>> |
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165 o = (DA<S>) (DA<R>) null; // <<fail 20>> |
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166 |
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167 // Raw (asymmetrical!) |
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168 o = (DA) (DB<Number>) null; // <<pass>> |
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169 o = (DA<Number>) (DB) null; // <<warn 11>> |
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170 o = (DA<?>) (DB) null; // <<pass>> |
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171 o = (DA<? extends Object>) (DB) null; // <<pass>> |
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172 o = (DA<? extends Number>) (DB) null; // <<warn 12>> |
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173 |
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174 o = (DB) (DA<Number>) null; // <<pass>> |
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175 o = (DB<Number>) (DA) null; // <<warn 13>> |
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176 o = (DB<?>) (DA) null; // <<pass>> |
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177 o = (DB<? extends Object>) (DA) null; // <<pass>> |
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178 o = (DB<? extends Number>) (DA) null; // <<warn 14>> |
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179 |
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180 o = (DC<?>) (DA<?>) null; // <<pass>> |
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181 o = (DC<?>) (DA<? super String>) null; // <<fail 21>> |
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182 } |
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183 |
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184 } |
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