ShortcutListener on Multiple TextFields question

I'm kind of new to all this.
I have 2 TextFields.
public TextField t1 = new TextField();
public TextField t2 = new TextField();

I have 1 shortcutListener
ShortcutListener enter = new ShortcutListener("enter",
                KeyCode.ENTER, null) {
           @Override
            public void handleAction(Object sender, Object target) {
             ///HOW DO I CHECK WITCH TextField CALLED IT 
            ///something like
            if(t1){
                DO SOMETHING 
            }else{
                DO SOMETHING ELSE
             }

     }
};
t1.addShortcutListener(enter);
t2.addShortcutListener(enter);

I can't figure out from what Object (sender,target) I have to take what info.

Thanks Anna.