/*
* 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();
}
}