How to set my working directory?

Question

Hy! This is my first post on this forum. I hope you can help me.
I need to save a file in an existing folder, inside my current working directory. I've tried to set the folder where I want to save my file as the working directory.This is what I tried to do:
try{
          System.setProperty("user.dir",myDirectoryName);
          PrintWriter file = new PrintWriter(new BufferedWriter(new FileWriter(jtp.getTitleAt(jtp.getSelectedIndex()))));
                              file.print(((JTextArea)jtp.getSelectedComponent()).getText());
file.close();          
}catch(IOException mes){
          System.out.println("Nu pot sa creez fisier");
But....is not working,because the file is created in the old working directory.
I thought that using a file chooser could help me,but the problem is that this saving is just an intermediate step in compiling the file,so the use of a FileChooser would not be appropiate.
Thank's.

Answer 1

Thank you,it helped me a lot.
I have now another problem: I want to run some 16 bits programs. Since there are some problems with that, I've created some 32 bit programs in C that run those 16 bit programs,and then I ran those programs from my Java program. The problem is that this approach works fine only for some programs,not for all. I'll put below the code I wrote(hope it won't be too much):
     try{//the launching programs runs tasm.exe program-works fine
          //          Process proc=Runtime.getRuntime().exec(args);
                    Process proc = new ProcessBuilder("launching","p0.asm"/*"p"+jtp.getSelectedIndex()+".asm"*/).start();
                    InputStream istr = proc.getInputStream();
     BufferedReader br = new BufferedReader(new InputStreamReader(istr));
     String str; // Temporary String variable
     while ((str = br.readLine()) != null) temp+=(str+"\n");
     try { proc.waitFor(); }
     catch (InterruptedException ee){
                         System.err.println("Process was interrupted");
//...link program runs tlink.exe program- the tlink.exe doesn't stops,altough it //works fine when it runs from the command line
     Process proc = new ProcessBuilder("link","p0").start();
The launching program is:
#include <shlobj.h>
#include <shlwapi.h>
int main(int argc, char* argv[])
     SHELLEXECUTEINFO ShExecInfo;
     ShExecInfo.cbSize = sizeof(SHELLEXECUTEINFO);
ShExecInfo.fMask = NULL;
ShExecInfo.hwnd = NULL;
ShExecInfo.lpVerb="open";
     ShExecInfo.lpFile="tasm.exe";
     ShExecInfo.lpParameters=argv[1];
ShExecInfo.lpDirectory = NULL;
ShExecInfo.nShow = SW_MAXIMIZE;
ShExecInfo.hInstApp = NULL;
ShellExecuteEx(&ShExecInfo);
     return 0;
The link program is:
#include <shlobj.h>
#include <shlwapi.h>
int main(int argc, char* argv[])
     SHELLEXECUTEINFO ShExecInfo;
     ShExecInfo.cbSize = sizeof(SHELLEXECUTEINFO);
ShExecInfo.fMask = NULL;
ShExecInfo.hwnd = NULL;
ShExecInfo.lpVerb="open";
     ShExecInfo.lpFile="tlink.exe";
     ShExecInfo.lpParameters=argv[1];
ShExecInfo.lpDirectory = NULL;
ShExecInfo.nShow = SW_MAXIMIZE;
ShExecInfo.hInstApp = NULL;
ShellExecuteEx(&ShExecInfo);
     return 0;
My question is: why does it work for tasm and doesn't work for tlink? The programs are pretty much the some,don't they?
Thanks again for youre help.