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 = 'x'; 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 } catch (IllegalArgumentException expected) { 123 expected.printStackTrace(); 124 } 125 126 f = Main.class.getDeclaredField("z"); 127 show(f.get(null)); 128 f = Main.class.getDeclaredField("b"); 129 show(f.get(null)); 130 f = Main.class.getDeclaredField("c"); 131 show(f.get(null)); 132 f = Main.class.getDeclaredField("d"); 133 show(f.get(null)); 134 f = Main.class.getDeclaredField("f"); 135 show(f.get(null)); 136 f = Main.class.getDeclaredField("i"); 137 show(f.get(null)); 138 f = Main.class.getDeclaredField("j"); 139 show(f.get(null)); 140 f = Main.class.getDeclaredField("s"); 141 show(f.get(null)); 142 143 /* 144 private static boolean z = true; 145 private static byte b = 8; 146 private static char c = 'x'; 147 private static double d = Math.PI; 148 private static float f = 3.14f; 149 private static int i = 32; 150 private static long j = 0x0123456789abcdefL; 151 private static short s = 16; 152 */ 153 } 154 155 private static void show(Object o) { 156 System.out.println(o + " (" + (o != null ? o.getClass() : "null") + ")"); 157 } 158 159 public static void testMethodReflection() throws Exception { 160 System.out.println(Arrays.toString(String.class.getDeclaredConstructors())); 161 System.out.println(Arrays.toString(String.class.getDeclaredFields())); 162 System.out.println(Arrays.toString(String.class.getDeclaredMethods())); 163 164 System.out.println(Arrays.toString(Main.class.getInterfaces())); 165 System.out.println(Arrays.toString(String.class.getInterfaces())); 166 167 System.out.println(Main.class.getModifiers()); 168 System.out.println(String.class.getModifiers()); 169 170 System.out.println(String.class.isAssignableFrom(Object.class)); 171 System.out.println(Object.class.isAssignableFrom(String.class)); 172 173 System.out.println(String.class.isInstance("hello")); 174 System.out.println(String.class.isInstance(123)); 175 176 Method m; 177 178 m = Main.class.getDeclaredMethod("IV", int.class); 179 System.out.println(Arrays.toString(m.getParameterTypes())); 180 show(m.invoke(null, 4444)); 181 System.out.println(Arrays.toString(m.getParameterTypes())); 182 183 m = Main.class.getDeclaredMethod("IIV", int.class, int.class); 184 System.out.println(Arrays.toString(m.getParameterTypes())); 185 show(m.invoke(null, 1111, 2222)); 186 187 m = Main.class.getDeclaredMethod("III", int.class, int.class); 188 System.out.println(Arrays.toString(m.getParameterTypes())); 189 show(m.invoke(null, 1111, 2222)); 190 191 m = Main.class.getDeclaredMethod("sumArray", int[].class); 192 System.out.println(Arrays.toString(m.getParameterTypes())); 193 show(m.invoke(null, new int[] { 1, 2, 3, 4 })); 194 195 m = Main.class.getDeclaredMethod("concat", String[].class); 196 System.out.println(Arrays.toString(m.getParameterTypes())); 197 show(m.invoke(null, (Object) new String[] { "h", "e", "l", "l", "o" })); 198 199 m = Main.class.getDeclaredMethod("ZBCDFIJSV", boolean.class, byte.class, char.class, double.class, float.class, int.class, long.class, short.class); 200 System.out.println(Arrays.toString(m.getParameterTypes())); 201 show(m.invoke(null, true, (byte) 0, '1', 2, 3, 4, 5, (short) 6)); 202 203 m = Main.class.getDeclaredMethod("ZBCDLFIJSV", boolean.class, byte.class, char.class, double.class, String.class, float.class, int.class, long.class, short.class); 204 System.out.println(Arrays.toString(m.getParameterTypes())); 205 show(m.invoke(null, true, (byte) 0, '1', 2, "hello world", 3, 4, 5, (short) 6)); 206 207 try { 208 m = Main.class.getDeclaredMethod("thrower"); 209 System.out.println(Arrays.toString(m.getParameterTypes())); 210 show(m.invoke(null)); 211 System.out.println("************* should have thrown!"); 212 } catch (Exception expected) { 213 expected.printStackTrace(); 214 } 215 } 216 217 private static void thrower() { 218 throw new ArithmeticException("surprise!"); 219 } 220 221 private static int sumArray(int[] xs) { 222 int result = 0; 223 for (int x : xs) { 224 result += x; 225 } 226 return result; 227 } 228 229 private static String concat(String[] strings) { 230 String result = ""; 231 for (String s : strings) { 232 result += s; 233 } 234 return result; 235 } 236 237 private static void IV(int i) { 238 System.out.println(i); 239 } 240 241 private static void IIV(int i, int j) { 242 System.out.println(i + " " + j); 243 } 244 245 private static int III(int i, int j) { 246 System.out.println(i + " " + j); 247 return i + j; 248 } 249 250 private static void ZBCDFIJSV(boolean z, byte b, char c, double d, float f, int i, long l, short s) { 251 System.out.println(z + " " + b + " " + c + " " + d + " " + f + " " + i + " " + l + " " + s); 252 } 253 254 private static void ZBCDLFIJSV(boolean z, byte b, char c, double d, String string, float f, int i, long l, short s) { 255 System.out.println(z + " " + b + " " + c + " " + d + " " + " " + string + " " + f + " " + i + " " + l + " " + s); 256 } 257 258 public static void testConstructorReflection() throws Exception { 259 Constructor<?> ctor; 260 261 ctor = String.class.getConstructor(new Class[0]); 262 show(ctor.newInstance((Object[]) null)); 263 264 ctor = String.class.getConstructor(char[].class, int.class, int.class); 265 show(ctor.newInstance(new char[] { 'x', 'y', 'z', '!' }, 1, 2)); 266 } 267 268 public static void main(String[] args) throws Exception { 269 testFieldReflection(); 270 testMethodReflection(); 271 testConstructorReflection(); 272 } 273 } 274
