In this article, I develop a Chess application that runs on the desktop. I call it dummy chess because the algorithm I used just selects a move at random.
Tweet Imagine a situation where you suddenly need to obtain the bytecode of all the loaded classes in a the Java process.
You need to dig deeper. Obtain the bytecode of all classes loaded into the JVM. Got the coffee already? OK, three things then. Above is a slide from my talk: The important thing to remember here is that our VM will try to locate our class that we specify in our -javaagent parameter to the VM, and execute its premain method before the main method.
A registered ClassFileTransformer will intercept the loading of all application classes and will have access to their bytecode.
Incidentally, ClassFileTransformer can also transform the bytecode of the application classes and make the JVM load behave completely differently to the originally intended bytes.
The transform method has access to the application class name and the bytes that correspond to the body of the class. In our case we just dump the bytes into a file. Do it like a pro with a HSDB Earlier, we looked at how to create a simple javaagent that would intercept the classloading and write the bytes of all loaded classes into files on our file system.
That would be my default way of solving the problem of obtaining the bytecode for all loaded classes. In fact javaagents are particularly powerful, in fact the defacto way to tackle many similar problems as well.
HSDB resides in a sa-jdi.
Straight after connecting, we can see a list of Threads in the target Java process I picked Eclipse as my Java process. You can see the Create. The HotSpot Debugger functionality is of course not limited to generating class files. At the beginning of this post, we set ourselves on the path of obtaining the class files and we achieved just that.
Let me know how you got on!
What would be your way of solving the problem at hand? Tell me in the comment section below or find me on Twitter:For chess programming Java has lots of advantages but also some disadvantages.
Advantages The usage of a virtual machine makes Java chess programs able to run on any OS as Windows or Linux. Java programming - Chess moves (basic, no AI) Ask Question.
up vote 10 down vote favorite. 9. into something like [d4]?
So that instead of writing the two coordinates to access the element I would just write the "chess coordinate". Would I have to make an array that represents a line and then an array of that array?
Java is object. I'm writing a program that should be able to read and parse chess moves (SAN). RegEx help for chess moves (SAN) Ask Question. up vote 3 down vote favorite.
1. Splitting one method into multiple methods - Java Chess. 0. Regex negative lookbehind AND positive lookahead. We’ll use a slightly adjusted version of piece-square tables that are originally described in the chess-programming-wiki. The visualized piece-square tables visualized. We can decrease or increase the evaluation, depending on the location of the piece.
Need to create a java applet Need to create a java applet Hi people i need to create a java applet for which there will be 2 buttons to indicate small and big. I need to make a circle. When i click small the circle should be small and when i click big. This is par for the course for chess programs of that generation, though.
I remember an old DOS chess program that would allow "castling" by just switching the king and rook, regardless of whether there were pieces between them. One Win chess program I remember, was ridiculously easy to break if you used the take back a move function.