🚀 go-pugleaf

I'm wanting to concatenate a filename string to a directory string, both
of which came from a Filer selection.  For instance,

//*******************************************
String   sFileDir, sFileName;

dlg_File = new Filer(this, "Select File");
dlg_File.show();

sFileDir       = dlg_File.getDirectory();
sFileName   = dlg_File.getFile();

if (sFileName.length() > 0)
// Sidebar:  Is this the best way to check if a file was selected?
  {
   sle_FilePath.setText(sFileDir + "\\" + sFileName);        // show
path+file in Field control  <---Line13
   File  hdlFile = new File(sFileDir, sFileName);
   // do something with File
   }
//*******************************************

Unfortunately, the resulting text in sle_FilePath looks like:
"c:\winnt\temp\\file.txt"  If I change the expression in Line 13 to
(sFileDir + "\" + sFileName), the compiler chokes, saying I have an
unclosed quote.

So how do I add a backslash string to another string?

TIA.

Jack