Hey,

I'm starting to learn Java and I have a question concerning reflection.

I have the following class:


import java.util.regex.*;
public class parsePacket extends Thread {
private String strPacket;
private String strGame;
public parsePacket(String myPacket) {
Pattern p = Pattern.compile("[^A-Za-z0-9|@|=|.|&]");
Matcher m = p.matcher(myPacket);
myPacket=m.replaceAll("");
strPacket= myPacket;
}
public void run() {
strPacket=strPacket.substring(strPacket.indexOf("&")+1);
strGame=strPacket.substring(strPacket.indexOf("game")+5,strPacket.indexOf("&"));
logger.printAction("Loading class for "+strGame);
try{
Class plugin = Class.forName("games."+strGame+"."+strGame);
//What goes here???

}
catch(ClassNotFoundException e){
logger.printError("The plugin for that game was not found on the server", false);
}
}
}


And I am wondering how I can initialize a constructor of the class determined and pass a String to that constructor?

parsePacket myPacket = new parsePacket("blah");
myPacket.run();

That wasn't the question, I'm talking about reflection, not multithreading. The answer you gave me isn't correct for multithreading either; it would be parsePacketobject.start() (run is used for multithreading, read about it here: http://web.cefriel.it/~alfonso/SEBook/Part2/Multithreading.pdf

Anyway, The problem is I dont know how to use the object "plugin"

Class plugin = Class.forName("games."+strGame+"."+strGame);

You can't just do Plugin c = (Plugin)c.newInstance(); It doesn't work.

I seem to have gotten a little farther:

import java.util.regex.*;
import java.lang.reflect.*;
public class parsePacket extends Thread {
private String strPacket;
private String strGame;
public parsePacket(String myPacket) {
Pattern p = Pattern.compile("[^A-Za-z0-9|@|=|.|&]");
Matcher m = p.matcher(myPacket);
myPacket=m.replaceAll("");
strPacket= myPacket;
}
public void run() {
strPacket=strPacket.substring(strPacket.indexOf("&")+1);
strGame=strPacket.substring(strPacket.indexOf("game")+5,strPacket.indexOf("&"));
logger.printAction("Loading class for "+strGame);
try{
Class[] strArgsClass = new Class[] {String.class};
Object[] strArgs = new Object[] {strPacket};
Constructor strArgsConstructor;
Class plugin = Class.forName("games."+strGame+"."+strGame);
strArgsConstructor=plugin.getConstructor(strArgsCl ***);

}
catch(ClassNotFoundException e){
logger.printError("The plugin for that game was not found on the server", false);
}
catch(InstantiationException e){
logger.printError("There seems to be a bug with the plugin " + strGame+". ("+e+")",false);
}
catch(IllegalAccessException e){
logger.printError("There seems to be a bug with the plugin " + strGame+". ("+e+")",false);
}
catch(NoSuchMethodException e){
logger.printError("There seems to be a bug with the plugin " + strGame+". ("+e+")",false);
}
}
}

Any ideas on that last line?

Figured it out:


import java.util.regex.*;
import java.lang.reflect.*;
public class parsePacket extends Thread {
private String strPacket;
private String strGame;
public parsePacket(String myPacket) {
Pattern p = Pattern.compile("[^A-Za-z0-9|@|=|.|&]");
Matcher m = p.matcher(myPacket);
myPacket=m.replaceAll("");
strPacket= myPacket;
}
public void run() {
strPacket=strPacket.substring(strPacket.indexOf("&")+1);
strGame=strPacket.substring(strPacket.indexOf("game")+5,strPacket.indexOf("&"));
logger.printAction("Loading class for "+strGame);
try{
Class[] strArgsClass = new Class[] {String.class};
Object[] strArgs = new Object[] {strPacket};
Constructor strArgsConstructor;
Class plugin = Class.forName("games."+strGame+"."+strGame);
strArgsConstructor=plugin.getConstructor(strArgsCl ***);
strArgsConstructor.newInstance(strArgs);
}
catch(ClassNotFoundException e){
logger.printError("The plugin for that game was not found on the server", false);
}
catch(InstantiationException e){
logger.printError("There seems to be a bug with the plugin " + strGame+". ("+e+")",false);
}
catch(IllegalAccessException e){
logger.printError("There seems to be a bug with the plugin " + strGame+". ("+e+")",false);
}
catch(NoSuchMethodException e){
logger.printError("There seems to be a bug with the plugin " + strGame+". ("+e+")",false);
}
catch(InvocationTargetException e){
logger.printError("There seems to be a bug with the plugin " + strGame+". ("+e+")",false);
}
}
}