fileData = new TFileStream(applicationPath + "pay.ini", fmOpenReadWrite | fmShareExclusive);

import java.io.FileOutputStream;
import java.nio.channels.*;

public class FileLocking {
  public static void main(String[] args) throws Exception {
    FileOutputStream fos= new FileOutputStream("file.txt");
    FileLock fl = fos.getChannel().tryLock();
    if(fl != null) {
      System.out.println("Locked File");
      Thread.sleep(100);
      fl.release();
      System.out.println("Released Lock");
    }
    fos.close();
  }
}

public class RandomAccessFileIO extends RandomAccessFile
{
    public RandomAccessFileIO(File file, String mode) throws FileNotFoundException
    {
        super(file, mode);
    }
    public InputStream getInputStream()
    {
        return new RAFInputStream();
    }            
    public OutputStream getOutputStream()
    {
        return new RAFOutputStream();
    }
    private class RAFInputStream extends InputStream
    {
        @Override
        public int read() throws IOException
        {
            return RandomAccessFileIO.this.read();
        }        
    }
    private class RAFOutputStream extends OutputStream
    {
        @Override
        public void write(int b) throws IOException
        {
            RandomAccessFileIO.this.write(b);
        }        
    }
}