/*
* This file is part of the Jikes RVM project (http://jikesrvm.org).
*
* This file is licensed to You under the Eclipse Public License (EPL);
* You may not use this file except in compliance with the License. You
* may obtain a copy of the License at
*
* http://www.opensource.org/licenses/eclipse-1.0.php
*
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership.
*/
package test.org.jikesrvm.basic.core.reflect;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Comparator;
class tClass {
private static class ToStringComparator implements Comparator<Object> {
static final ToStringComparator COMPARATOR = new ToStringComparator();
public int compare(Object x, Object y) {
return x.toString().compareTo(y.toString());
}
}
public static void gc() {
System.gc();
}
public static String hello(String say_this) {
System.out.println("before gc arg=" + say_this);
gc();
System.out.println("after gc arg=" + say_this);
return "And I Say Hello Back";
}
public static int iello(String say_this, int return_this) {
System.out.println("before gc arg=" + say_this);
gc();
System.out.println("after gc arg=" + say_this);
return return_this;
}
public static long lello(String say_this, long return_this) {
System.out.println("before gc arg=" + say_this);
gc();
System.out.println("after gc arg=" + say_this);
return return_this;
}
@SuppressWarnings({"UnusedDeclaration"})
public static int jello(int return_this, String say_this, int junk, int more_junk) {
System.out.println("before gc arg=" + say_this);
gc();
System.out.println("after gc arg=" + say_this);
return return_this;
}
public String vello(String say_this) {
return "And I Say Vello Back";
}
public tClass(String s) {
System.out.println("tClass constructor called with " + s);
}
@SuppressWarnings({"UnusedDeclaration"})
private tClass() {
System.out.println("tClass private constructor called!");
}
public static void main(String[] args) throws Exception {
// Class.forName
//
Class c = Class.forName("test.org.jikesrvm.basic.core.reflect.tClass");
System.out.println(c);
try {
Class.forName("NotAClassSoThrowAnExceptionPlease");
} catch (ClassNotFoundException e) {
System.out.println("caught ClassNotFoundException");
}
// ----------------------------- Class.isArray()
//
if (c.isArray()) System.out.println(c + " is an array????");
else System.out.println(c + " is not an array...good");
// ------------------------------ Class.getConstructors
//
Constructor[] ctors = c.getConstructors();
Arrays.sort(ctors, ToStringComparator.COMPARATOR);
System.out.println(c + " has " + ctors.length + " visible constructors");
for (int i = 0; i < ctors.length; ++i)
System.out.println(" " + i + ": " + ctors[i]);
Constructor[] declaredCtors = c.getDeclaredConstructors();
Arrays.sort(declaredCtors, ToStringComparator.COMPARATOR);
System.out.println(c + " has " + declaredCtors.length + " declared constructors");
for (int i = 0; i < declaredCtors.length; ++i)
System.out.println(" " + i + ": " + declaredCtors[i]);
// Class.getMethods Method.getName
//
Method[] methods = c.getMethods();
Method hello = null;
Method iello = null;
Method lello = null;
Method jello = null;
Method vello = null;
Method[] declaredMethods = c.getDeclaredMethods();
Arrays.sort(declaredMethods, ToStringComparator.COMPARATOR);
System.out.println(c + " has a total number of methods: " + methods.length);
for (final Method method : methods) {
// dont print the methods out, signitures are different in
// java and RVM libraries for java/lang/Object methods.
// System.out.println( methods[i] );
if (method.getName().equals("hello")) hello = method;
if (method.getName().equals("iello")) iello = method;
if (method.getName().equals("lello")) lello = method;
if (method.getName().equals("jello")) jello = method;
if (method.getName().equals("vello")) vello = method;
}
System.out.println(" Number of declared methods: " + declaredMethods.length);
for (Method method : declaredMethods) System.out.println(method);
// ------------------------------ invoke methods taking String, returning ref (String)
//
if (hello == null) {
System.out.println("tClass.hello not found!");
System.exit(1);
} else {
System.out.println("================= READY TO CALL: " + hello);
}
// Method.invoke
//
int n_calls = 3; // loop to see if we can crash gc
while (n_calls-- > 0) {
String result = (String) hello.invoke(null, "I Say Hello to You!");
System.out.println(result);
}
// ------------------------------ invoke methods taking String,int; returning int
//
if (iello == null) {
System.out.println("tClass.iello not found!");
System.exit(1);
} else {
System.out.println("================= READY TO CALL: " + iello);
}
// Method.invoke
//
n_calls = 3; // loop to see if we can crash gc
while (n_calls-- > 0) {
Integer result = (Integer) iello.invoke(null, "I Say Iello to You!", 99);
System.out.println("Does this>" + result + "< look like 99?");
}
// ------------------------------ invoke methods taking String,long; returning long
//
if (lello == null) {
System.out.println("tClass.lello not found!");
System.exit(1);
} else {
System.out.println("================= READY TO CALL: " + lello);
}
// Method.invoke
//
n_calls = 3; // loop to see if we can crash gc
while (n_calls-- > 0) {
Long result = (Long) lello.invoke(null, "I Say Lello to You!", 99);
System.out.println("Does this>" + result + "< look like 99?");
}
// ------------------------------ invoke methods taking String,int; returning int
//
if (jello == null) {
System.out.println("tClass.jello not found!");
System.exit(1);
} else {
System.out.println("================= READY TO CALL: " + jello);
}
// Method.invoke
//
n_calls = 3; // loop to see if we can crash gc
while (n_calls-- > 0) {
Integer result = (Integer) jello.invoke(null, 99, "I Say Jello to You!", 95, 94);
System.out.println("Does this>" + result + "< look like 99?");
}
// ------------------------------ newInstance
new tClass("Hi!");
tClass tc_dyn = (tClass) ctors[0].newInstance("I'm dynamic!");
// ------------------------------ invoke methods taking String, returning String, but now virtual
//
if (vello == null) {
System.out.println("tClass.vello not found!");
System.exit(1);
} else {
System.out.println("================= READY TO CALL: " + vello);
}
// Method.invoke
//
n_calls = 3; // loop to see if we can crash gc
while (n_calls-- > 0) {
String result = (String) vello.invoke(tc_dyn, "I Say Vello to You!");
System.out.println(result);
}
}
}