I/O Class

[DK]

I've been trying to write a method to do input in this class. I import java.io.* and create a BufferedReader as usual but the thing is, we always had a main method with 'throws IOException' in the header. If the InputOutput class doesn't have a main method, how do I throw an IOException???Can anyone help me?? :-/Thanks.

[Majin_Blues]

hmm... my guess is you insert the "throws IOException" in the header of the method in which you are calling a readline or something...

public void getStuff(String a) throws IOException{
}

but that's a guess...

[DK]

I tried that but it seems that I also need to add 'throws IOException' to the header of the main method where I actually call the input method of the I/O class. Otherwise, I get an error message.  

[pandachan]

I had problem with that too.  Finally I found a code that uses
try and catch.  It seems to work!

[DK]

Just need some reassurance.
Are we allowed to have throws IOException in the main method or would that count as doing I/O stuff where we're not supposed to?

Concerning the try & catch stuff, how does it work?

[pandachan]

I'm not sure how "try and catch" works...but as the website that I found says that there are 3 types of throw something stuff.  And throw sth after the main method doesn't work if you wanna pass it to methods.  try and catch is the one that works...ah...I dunno..but try..it works...

sth like this:

try {
   line = in.readLine();
} catch (IOException ioe) {
                 
}

try the line inside the "try" and if the IOException is caught, then do sth...so do nth(<== this is the above case).
well...there might be another way to do this...does anyone did differently??

[Majin_Blues]

why not throw in the "Throws IOException" in the main header anyway?

it won't affect the program even if you removed all bufferedreader  stuff...

[DK]

would it be ok then if I just added throws IOException to the main header and to the input method's header of the I/O class?   :-/cuz it works without having to do the try & catch stuff.

[gundamf91]

all i did was
(part of my code) this is a method not main

  public void Input() throws IOException {
...
}
and it works fine

[DK]

I think the reason why yours works is that you have 'void' instead of returning a value. When I replace 'void' with something like 'int', then I get an error (at main) saying that I need to be able to throw an IOException.

gundamf91 said:

all i did was
(part of my code) this is a method not main

  public void Input() throws IOException {
...
}
and it works fine

[gundamf91]

i have other methods to return the values...my input method just does input and output...

[DK]

oh.why didn't I think of that? It sure solves the problem I'm having. thanx.

[gundamf91]

oh my god i actually helped? hahha what a fluke i am  ;D

[DK]

umm... :-/just wondering... this is what the handout says:
"When you want to read something from the keyboard, you will have to call a method in the input/output class which reads from the keyboard and returns the information to the calling method as a return value."

does this mean we must return the value inputted from the keyboard once we call the input method?

[gundamf91]

oh my god.....sigh....