1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 import java.lang.reflect.*; 18 import java.util.*; 19 20 class Main { 21 private static boolean z = true; 22 private static byte b = 8; 23 private static char c = '\u2714'; 24 private static double d = Math.PI; 25 private static float f = 3.14f; 26 private static int i = 32; 27 private static long j = 0x0123456789abcdefL; 28 private static short s = 16; 29 30 public static void testFieldReflection() throws Exception { 31 Field f; 32 33 f = Main.class.getDeclaredField("z"); 34 System.out.println(f.getBoolean(null)); 35 f = Main.class.getDeclaredField("b"); 36 System.out.println(f.getByte(null)); 37 f = Main.class.getDeclaredField("c"); 38 System.out.println(f.getChar(null)); 39 f = Main.class.getDeclaredField("d"); 40 System.out.println(f.getDouble(null)); 41 f = Main.class.getDeclaredField("f"); 42 System.out.println(f.getFloat(null)); 43 f = Main.class.getDeclaredField("i"); 44 System.out.println(f.getInt(null)); 45 f = Main.class.getDeclaredField("j"); 46 System.out.println(f.getLong(null)); 47 f = Main.class.getDeclaredField("s"); 48 System.out.println(f.getShort(null)); 49 50 f = Main.class.getDeclaredField("z"); 51 f.setBoolean(null, false); 52 f = Main.class.getDeclaredField("b"); 53 f.setByte(null, (byte) 7); 54 f = Main.class.getDeclaredField("c"); 55 f.setChar(null, 'y'); 56 f = Main.class.getDeclaredField("d"); 57 f.setDouble(null, 2.7); 58 f = Main.class.getDeclaredField("f"); 59 f.setFloat(null, 2.7f); 60 f = Main.class.getDeclaredField("i"); 61 f.setInt(null, 31); 62 f = Main.class.getDeclaredField("j"); 63 f.setLong(null, 63); 64 f = Main.class.getDeclaredField("s"); 65 f.setShort(null, (short) 15); 66 67 f = Main.class.getDeclaredField("z"); 68 System.out.println(f.getBoolean(null)); 69 f = Main.class.getDeclaredField("b"); 70 System.out.println(f.getByte(null)); 71 f = Main.class.getDeclaredField("c"); 72 System.out.println(f.getChar(null)); 73 f = Main.class.getDeclaredField("d"); 74 System.out.println(f.getDouble(null)); 75 f = Main.class.getDeclaredField("f"); 76 System.out.println(f.getFloat(null)); 77 f = Main.class.getDeclaredField("i"); 78 System.out.println(f.getInt(null)); 79 f = Main.class.getDeclaredField("j"); 80 System.out.println(f.getLong(null)); 81 f = Main.class.getDeclaredField("s"); 82 System.out.println(f.getShort(null)); 83 84 f = Main.class.getDeclaredField("z"); 85 f.set(null, Boolean.valueOf(true)); 86 f = Main.class.getDeclaredField("b"); 87 f.set(null, Byte.valueOf((byte) 6)); 88 f = Main.class.getDeclaredField("c"); 89 f.set(null, Character.valueOf('z')); 90 f = Main.class.getDeclaredField("d"); 91 f.set(null, Double.valueOf(1.3)); 92 f = Main.class.getDeclaredField("f"); 93 f.set(null, Float.valueOf(1.3f)); 94 f = Main.class.getDeclaredField("i"); 95 f.set(null, Integer.valueOf(30)); 96 f = Main.class.getDeclaredField("j"); 97 f.set(null, Long.valueOf(62)); 98 f.set(null, Integer.valueOf(62)); 99 f = Main.class.getDeclaredField("s"); 100 f.set(null, Short.valueOf((short) 14)); 101 102 f = Main.class.getDeclaredField("z"); 103 System.out.println(f.getBoolean(null)); 104 f = Main.class.getDeclaredField("b"); 105 System.out.println(f.getByte(null)); 106 f = Main.class.getDeclaredField("c"); 107 System.out.println(f.getChar(null)); 108 f = Main.class.getDeclaredField("d"); 109 System.out.println(f.getDouble(null)); 110 f = Main.class.getDeclaredField("f"); 111 System.out.println(f.getFloat(null)); 112 f = Main.class.getDeclaredField("i"); 113 System.out.println(f.getInt(null)); 114 f = Main.class.getDeclaredField("j"); 115 System.out.println(f.getLong(null)); 116 f = Main.class.getDeclaredField("s"); 117 System.out.println(f.getShort(null)); 118 119 try { 120 f = Main.class.getDeclaredField("s"); 121 f.set(null, Integer.valueOf(14)); 122 System.out.println("************* should have thrown!"); 123 } catch (IllegalArgumentException expected) { 124 System.out.println("got expected IllegalArgumentException"); 125 } 126 127 f = Main.class.getDeclaredField("z"); 128 show(f.get(null)); 129 f = Main.class.getDeclaredField("b"); 130 show(f.get(null)); 131 f = Main.class.getDeclaredField("c"); 132 show(f.get(null)); 133 f = Main.class.getDeclaredField("d"); 134 show(f.get(null)); 135 f = Main.class.getDeclaredField("f"); 136 show(f.get(null)); 137 f = Main.class.getDeclaredField("i"); 138 show(f.get(null)); 139 f = Main.class.getDeclaredField("j"); 140 show(f.get(null)); 141 f = Main.class.getDeclaredField("s"); 142 show(f.get(null)); 143 144 /* 145 private static boolean z = true; 146 private static byte b = 8; 147 private static char c = '\u2714'; 148 private static double d = Math.PI; 149 private static float f = 3.14f; 150 private static int i = 32; 151 private static long j = 0x0123456789abcdefL; 152 private static short s = 16; 153 */ 154 } 155 156 private static void show(Object o) { 157 System.out.println(o + " (" + (o != null ? o.getClass() : "null") + ")"); 158 } 159 160 /** 161 * Sorts the input array using the comparator and returns the sorted array. 162 */ 163 private static Object[] sort(Object[] objects, Comparator<Object> comp) { 164 Arrays.sort(objects, comp); 165 return objects; 166 } 167 168 public static void testMethodReflection() throws Exception { 169 Comparator<Object> comp = new Comparator<Object>() { 170 public int compare(Object a, Object b) { 171 return a.toString().compareTo(b.toString()); 172 } 173 public boolean equals(Object b) { 174 return this == b; 175 } 176 }; 177 178 // Sort the return values by their string values since the order is undefined by the spec. 179 System.out.println(Arrays.toString(sort(String.class.getDeclaredConstructors(), comp))); 180 System.out.println(Arrays.toString(sort(String.class.getDeclaredFields(), comp))); 181 System.out.println(Arrays.toString(sort(String.class.getDeclaredMethods(), comp))); 182 183 System.out.println(Arrays.toString(Main.class.getInterfaces())); 184 System.out.println(Arrays.toString(String.class.getInterfaces())); 185 186 System.out.println(Main.class.getModifiers()); 187 System.out.println(String.class.getModifiers()); 188 189 System.out.println(String.class.isAssignableFrom(Object.class)); 190 System.out.println(Object.class.isAssignableFrom(String.class)); 191 192 System.out.println(String.class.isInstance("hello")); 193 System.out.println(String.class.isInstance(123)); 194 195 Method m; 196 197 m = Main.class.getDeclaredMethod("IV", int.class); 198 System.out.println(Arrays.toString(m.getParameterTypes())); 199 show(m.invoke(null, 4444)); 200 System.out.println(Arrays.toString(m.getParameterTypes())); 201 202 m = Main.class.getDeclaredMethod("IIV", int.class, int.class); 203 System.out.println(Arrays.toString(m.getParameterTypes())); 204 show(m.invoke(null, 1111, 2222)); 205 206 m = Main.class.getDeclaredMethod("III", int.class, int.class); 207 System.out.println(Arrays.toString(m.getParameterTypes())); 208 show(m.invoke(null, 1111, 2222)); 209 210 m = Main.class.getDeclaredMethod("sumArray", int[].class); 211 System.out.println(Arrays.toString(m.getParameterTypes())); 212 show(m.invoke(null, new int[] { 1, 2, 3, 4 })); 213 214 m = Main.class.getDeclaredMethod("concat", String[].class); 215 System.out.println(Arrays.toString(m.getParameterTypes())); 216 show(m.invoke(null, (Object) new String[] { "h", "e", "l", "l", "o" })); 217 218 m = Main.class.getDeclaredMethod("ZBCDFIJSV", boolean.class, byte.class, char.class, double.class, float.class, int.class, long.class, short.class); 219 System.out.println(Arrays.toString(m.getParameterTypes())); 220 show(m.invoke(null, true, (byte) 0, '1', 2, 3, 4, 5, (short) 6)); 221 222 m = Main.class.getDeclaredMethod("ZBCDLFIJSV", boolean.class, byte.class, char.class, double.class, String.class, float.class, int.class, long.class, short.class); 223 System.out.println(Arrays.toString(m.getParameterTypes())); 224 show(m.invoke(null, true, (byte) 0, '1', 2, "hello world", 3, 4, 5, (short) 6)); 225 226 try { 227 m = Main.class.getDeclaredMethod("thrower"); 228 System.out.println(Arrays.toString(m.getParameterTypes())); 229 show(m.invoke(null)); 230 System.out.println("************* should have thrown!"); 231 } catch (InvocationTargetException expected) { 232 System.out.println("got expected InvocationTargetException"); 233 } 234 } 235 236 private static void thrower() { 237 throw new ArithmeticException("surprise!"); 238 } 239 240 private static int sumArray(int[] xs) { 241 int result = 0; 242 for (int x : xs) { 243 result += x; 244 } 245 return result; 246 } 247 248 private static String concat(String[] strings) { 249 String result = ""; 250 for (String s : strings) { 251 result += s; 252 } 253 return result; 254 } 255 256 private static void IV(int i) { 257 System.out.println(i); 258 } 259 260 private static void IIV(int i, int j) { 261 System.out.println(i + " " + j); 262 } 263 264 private static int III(int i, int j) { 265 System.out.println(i + " " + j); 266 return i + j; 267 } 268 269 private static void ZBCDFIJSV(boolean z, byte b, char c, double d, float f, int i, long l, short s) { 270 System.out.println(z + " " + b + " " + c + " " + d + " " + f + " " + i + " " + l + " " + s); 271 } 272 273 private static void ZBCDLFIJSV(boolean z, byte b, char c, double d, String string, float f, int i, long l, short s) { 274 System.out.println(z + " " + b + " " + c + " " + d + " " + " " + string + " " + f + " " + i + " " + l + " " + s); 275 } 276 277 public static void testConstructorReflection() throws Exception { 278 Constructor<String> ctor = String.class.getConstructor(); 279 show(ctor.newInstance()); 280 281 ctor = String.class.getConstructor(char[].class, int.class, int.class); 282 show(ctor.newInstance(new char[] { '\u2714', 'y', 'z', '!' }, 1, 2)); 283 } 284 285 private static void testPackagePrivateConstructor() { 286 try { 287 Class<?> c = Class.forName("sub.PPClass"); 288 Constructor<?> cons = c.getConstructor(); 289 cons.newInstance(); 290 throw new RuntimeException("Expected IllegalAccessException."); 291 } catch (IllegalAccessException e) { 292 // Expected. 293 } catch (Exception e) { 294 // Error. 295 e.printStackTrace(System.out); 296 } 297 } 298 299 private static void testPackagePrivateAccessibleConstructor() { 300 try { 301 Class<?> c = Class.forName("sub.PPClass"); 302 Constructor<?> cons = c.getConstructor(); 303 cons.setAccessible(true); // ensure we prevent IllegalAccessException 304 cons.newInstance(); 305 } catch (Exception e) { 306 // Error. 307 e.printStackTrace(System.out); 308 } 309 } 310 311 public static void main(String[] args) throws Exception { 312 testFieldReflection(); 313 testMethodReflection(); 314 testConstructorReflection(); 315 testPackagePrivateConstructor(); 316 testPackagePrivateAccessibleConstructor(); 317 } 318 } 319
