| /* |
| * Copyright (C) 2011 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| import java.lang.reflect.*; |
| import java.util.*; |
| |
| class Main { |
| private static boolean z = true; |
| private static byte b = 8; |
| private static char c = '\u2714'; |
| private static double d = Math.PI; |
| private static float f = 3.14f; |
| private static int i = 32; |
| private static long j = 0x0123456789abcdefL; |
| private static short s = 16; |
| |
| public static void testFieldReflection() throws Exception { |
| Field f; |
| |
| f = Main.class.getDeclaredField("z"); |
| System.out.println(f.getBoolean(null)); |
| f = Main.class.getDeclaredField("b"); |
| System.out.println(f.getByte(null)); |
| f = Main.class.getDeclaredField("c"); |
| System.out.println(f.getChar(null)); |
| f = Main.class.getDeclaredField("d"); |
| System.out.println(f.getDouble(null)); |
| f = Main.class.getDeclaredField("f"); |
| System.out.println(f.getFloat(null)); |
| f = Main.class.getDeclaredField("i"); |
| System.out.println(f.getInt(null)); |
| f = Main.class.getDeclaredField("j"); |
| System.out.println(f.getLong(null)); |
| f = Main.class.getDeclaredField("s"); |
| System.out.println(f.getShort(null)); |
| |
| f = Main.class.getDeclaredField("z"); |
| f.setBoolean(null, false); |
| f = Main.class.getDeclaredField("b"); |
| f.setByte(null, (byte) 7); |
| f = Main.class.getDeclaredField("c"); |
| f.setChar(null, 'y'); |
| f = Main.class.getDeclaredField("d"); |
| f.setDouble(null, 2.7); |
| f = Main.class.getDeclaredField("f"); |
| f.setFloat(null, 2.7f); |
| f = Main.class.getDeclaredField("i"); |
| f.setInt(null, 31); |
| f = Main.class.getDeclaredField("j"); |
| f.setLong(null, 63); |
| f = Main.class.getDeclaredField("s"); |
| f.setShort(null, (short) 15); |
| |
| f = Main.class.getDeclaredField("z"); |
| System.out.println(f.getBoolean(null)); |
| f = Main.class.getDeclaredField("b"); |
| System.out.println(f.getByte(null)); |
| f = Main.class.getDeclaredField("c"); |
| System.out.println(f.getChar(null)); |
| f = Main.class.getDeclaredField("d"); |
| System.out.println(f.getDouble(null)); |
| f = Main.class.getDeclaredField("f"); |
| System.out.println(f.getFloat(null)); |
| f = Main.class.getDeclaredField("i"); |
| System.out.println(f.getInt(null)); |
| f = Main.class.getDeclaredField("j"); |
| System.out.println(f.getLong(null)); |
| f = Main.class.getDeclaredField("s"); |
| System.out.println(f.getShort(null)); |
| |
| f = Main.class.getDeclaredField("z"); |
| f.set(null, Boolean.valueOf(true)); |
| f = Main.class.getDeclaredField("b"); |
| f.set(null, Byte.valueOf((byte) 6)); |
| f = Main.class.getDeclaredField("c"); |
| f.set(null, Character.valueOf('z')); |
| f = Main.class.getDeclaredField("d"); |
| f.set(null, Double.valueOf(1.3)); |
| f = Main.class.getDeclaredField("f"); |
| f.set(null, Float.valueOf(1.3f)); |
| f = Main.class.getDeclaredField("i"); |
| f.set(null, Integer.valueOf(30)); |
| f = Main.class.getDeclaredField("j"); |
| f.set(null, Long.valueOf(62)); |
| f.set(null, Integer.valueOf(62)); |
| f = Main.class.getDeclaredField("s"); |
| f.set(null, Short.valueOf((short) 14)); |
| |
| f = Main.class.getDeclaredField("z"); |
| System.out.println(f.getBoolean(null)); |
| f = Main.class.getDeclaredField("b"); |
| System.out.println(f.getByte(null)); |
| f = Main.class.getDeclaredField("c"); |
| System.out.println(f.getChar(null)); |
| f = Main.class.getDeclaredField("d"); |
| System.out.println(f.getDouble(null)); |
| f = Main.class.getDeclaredField("f"); |
| System.out.println(f.getFloat(null)); |
| f = Main.class.getDeclaredField("i"); |
| System.out.println(f.getInt(null)); |
| f = Main.class.getDeclaredField("j"); |
| System.out.println(f.getLong(null)); |
| f = Main.class.getDeclaredField("s"); |
| System.out.println(f.getShort(null)); |
| |
| try { |
| f = Main.class.getDeclaredField("s"); |
| f.set(null, Integer.valueOf(14)); |
| System.out.println("************* should have thrown!"); |
| } catch (IllegalArgumentException expected) { |
| System.out.println("got expected IllegalArgumentException"); |
| } |
| |
| f = Main.class.getDeclaredField("z"); |
| show(f.get(null)); |
| f = Main.class.getDeclaredField("b"); |
| show(f.get(null)); |
| f = Main.class.getDeclaredField("c"); |
| show(f.get(null)); |
| f = Main.class.getDeclaredField("d"); |
| show(f.get(null)); |
| f = Main.class.getDeclaredField("f"); |
| show(f.get(null)); |
| f = Main.class.getDeclaredField("i"); |
| show(f.get(null)); |
| f = Main.class.getDeclaredField("j"); |
| show(f.get(null)); |
| f = Main.class.getDeclaredField("s"); |
| show(f.get(null)); |
| |
| /* |
| private static boolean z = true; |
| private static byte b = 8; |
| private static char c = '\u2714'; |
| private static double d = Math.PI; |
| private static float f = 3.14f; |
| private static int i = 32; |
| private static long j = 0x0123456789abcdefL; |
| private static short s = 16; |
| */ |
| } |
| |
| private static void show(Object o) { |
| System.out.println(o + " (" + (o != null ? o.getClass() : "null") + ")"); |
| } |
| |
| /** |
| * Sorts the input array using the comparator and returns the sorted array. |
| */ |
| private static Object[] sort(Object[] objects, Comparator<Object> comp) { |
| Arrays.sort(objects, comp); |
| return objects; |
| } |
| |
| public static void testMethodReflection() throws Exception { |
| Comparator<Object> comp = new Comparator<Object>() { |
| public int compare(Object a, Object b) { |
| return a.toString().compareTo(b.toString()); |
| } |
| public boolean equals(Object b) { |
| return this == b; |
| } |
| }; |
| |
| // Sort the return values by their string values since the order is undefined by the spec. |
| System.out.println(Arrays.toString(sort(String.class.getDeclaredConstructors(), comp))); |
| System.out.println(Arrays.toString(sort(String.class.getDeclaredFields(), comp))); |
| System.out.println(Arrays.toString(sort(String.class.getDeclaredMethods(), comp))); |
| |
| System.out.println(Arrays.toString(Main.class.getInterfaces())); |
| System.out.println(Arrays.toString(String.class.getInterfaces())); |
| |
| System.out.println(Main.class.getModifiers()); |
| System.out.println(String.class.getModifiers()); |
| |
| System.out.println(String.class.isAssignableFrom(Object.class)); |
| System.out.println(Object.class.isAssignableFrom(String.class)); |
| |
| System.out.println(String.class.isInstance("hello")); |
| System.out.println(String.class.isInstance(123)); |
| |
| Method m; |
| |
| m = Main.class.getDeclaredMethod("IV", int.class); |
| System.out.println(Arrays.toString(m.getParameterTypes())); |
| show(m.invoke(null, 4444)); |
| System.out.println(Arrays.toString(m.getParameterTypes())); |
| |
| m = Main.class.getDeclaredMethod("IIV", int.class, int.class); |
| System.out.println(Arrays.toString(m.getParameterTypes())); |
| show(m.invoke(null, 1111, 2222)); |
| |
| m = Main.class.getDeclaredMethod("III", int.class, int.class); |
| System.out.println(Arrays.toString(m.getParameterTypes())); |
| show(m.invoke(null, 1111, 2222)); |
| |
| m = Main.class.getDeclaredMethod("sumArray", int[].class); |
| System.out.println(Arrays.toString(m.getParameterTypes())); |
| show(m.invoke(null, new int[] { 1, 2, 3, 4 })); |
| |
| m = Main.class.getDeclaredMethod("concat", String[].class); |
| System.out.println(Arrays.toString(m.getParameterTypes())); |
| show(m.invoke(null, (Object) new String[] { "h", "e", "l", "l", "o" })); |
| |
| m = Main.class.getDeclaredMethod("ZBCDFIJSV", boolean.class, byte.class, char.class, double.class, float.class, int.class, long.class, short.class); |
| System.out.println(Arrays.toString(m.getParameterTypes())); |
| show(m.invoke(null, true, (byte) 0, '1', 2, 3, 4, 5, (short) 6)); |
| |
| m = Main.class.getDeclaredMethod("ZBCDLFIJSV", boolean.class, byte.class, char.class, double.class, String.class, float.class, int.class, long.class, short.class); |
| System.out.println(Arrays.toString(m.getParameterTypes())); |
| show(m.invoke(null, true, (byte) 0, '1', 2, "hello world", 3, 4, 5, (short) 6)); |
| |
| try { |
| m = Main.class.getDeclaredMethod("thrower"); |
| System.out.println(Arrays.toString(m.getParameterTypes())); |
| show(m.invoke(null)); |
| System.out.println("************* should have thrown!"); |
| } catch (InvocationTargetException expected) { |
| System.out.println("got expected InvocationTargetException"); |
| } |
| } |
| |
| private static void thrower() { |
| throw new ArithmeticException("surprise!"); |
| } |
| |
| private static int sumArray(int[] xs) { |
| int result = 0; |
| for (int x : xs) { |
| result += x; |
| } |
| return result; |
| } |
| |
| private static String concat(String[] strings) { |
| String result = ""; |
| for (String s : strings) { |
| result += s; |
| } |
| return result; |
| } |
| |
| private static void IV(int i) { |
| System.out.println(i); |
| } |
| |
| private static void IIV(int i, int j) { |
| System.out.println(i + " " + j); |
| } |
| |
| private static int III(int i, int j) { |
| System.out.println(i + " " + j); |
| return i + j; |
| } |
| |
| private static void ZBCDFIJSV(boolean z, byte b, char c, double d, float f, int i, long l, short s) { |
| System.out.println(z + " " + b + " " + c + " " + d + " " + f + " " + i + " " + l + " " + s); |
| } |
| |
| private static void ZBCDLFIJSV(boolean z, byte b, char c, double d, String string, float f, int i, long l, short s) { |
| System.out.println(z + " " + b + " " + c + " " + d + " " + " " + string + " " + f + " " + i + " " + l + " " + s); |
| } |
| |
| public static void testConstructorReflection() throws Exception { |
| Constructor<String> ctor = String.class.getConstructor(); |
| show(ctor.newInstance()); |
| |
| ctor = String.class.getConstructor(char[].class, int.class, int.class); |
| show(ctor.newInstance(new char[] { '\u2714', 'y', 'z', '!' }, 1, 2)); |
| } |
| |
| private static void testPackagePrivateConstructor() { |
| try { |
| Class<?> c = Class.forName("sub.PPClass"); |
| Constructor<?> cons = c.getConstructor(); |
| cons.newInstance(); |
| throw new RuntimeException("Expected IllegalAccessException."); |
| } catch (IllegalAccessException e) { |
| // Expected. |
| } catch (Exception e) { |
| // Error. |
| e.printStackTrace(System.out); |
| } |
| } |
| |
| private static void testPackagePrivateAccessibleConstructor() { |
| try { |
| Class<?> c = Class.forName("sub.PPClass"); |
| Constructor<?> cons = c.getConstructor(); |
| cons.setAccessible(true); // ensure we prevent IllegalAccessException |
| cons.newInstance(); |
| } catch (Exception e) { |
| // Error. |
| e.printStackTrace(System.out); |
| } |
| } |
| |
| public static void main(String[] args) throws Exception { |
| testFieldReflection(); |
| testMethodReflection(); |
| testConstructorReflection(); |
| testPackagePrivateConstructor(); |
| testPackagePrivateAccessibleConstructor(); |
| } |
| } |