let me get out of that triblocal need to know that okay now i'm not going to hinder stuff anymore in the programmer needs to know that when they see the files they need to understand when you're doing dangerous stuff first is not senate questions about them this notion of throwing an exception so now here's the interesting thing that happens sometimes one exception gets thrown you know what you want to be like you want to say hey now file didn't exist i write out bad file and i keep executing sometimes you again exception and you have no idea what to do you try to you know you created this course plus the students that works just fine and you start reading lines from the file and it's just fine but before you get to the end of the file what happens you're a roomate comes along and deletes the file or like beecher computer on the head and your guests crashes or whatever your program selects kidding but your disc is no longer working this is actually happened before you try to say hey it buffered reader get me a line and it says does not want mine like i thought i had the file everything but there's no more 