Hey Everyone, was hoping that maybe someone out there would know what I am doing wrong.
  I am in a sketch that allows the user to selectInput(). I then want to find the file type (by finding the last three letters of the filename/path). That is all working fine, since I am printing as I go I know it is getting the correct substring. However, when I run the code below, every time, even if the extension is a .jpg or other acceptable format, there is a problem within my conditionals because I always get my _FileError2.
  The code below is a method where userfile is a global variable. The way I have it set up always works except when I threw in the substring check. Ideally I only want it to return true if the user chose a proper file type.
  Any help would be greatly appreciated.



boolean ChooseFile()
{
String _FileError2 = "The only acceptable file types are: .gif, .jpg, .tga, and .png.";
String userfile = selectInput();
int UserFileNameStringLength = userfile.length();
String extension = userfile.substring(UserFileNameStringLength-3);
print(extension);

if(extension != "jpg") //&& extension != "gif" && extension != "tga" && extension != "png")
 {
 println(_FileError2);
 exit();
 return false;
 }

 
 
if(userfile==null)
 {
 println(_FileError1);
 exit();
   return false;
 }
 
else
 {return true;}
 
}