[5802] in java-interest
Re: Exception handling and throwing
daemon@ATHENA.MIT.EDU (Walter Szewelanczyk)
Tue Feb 27 03:34:08 1996
From: "Walter Szewelanczyk" <Walter@adco.com>
To: Susan McDaniel <mcdaniel@umich.edu>
Date: Tue, 27 Feb 1996 01:55:04 +0000
CC: java-interest@java.sun.com
Hi Susan,
On Mon, 26 Feb 1996 14:19:49 -0500 (EST) Susan McDaniel
wrote :
> I'm trying to do file i/o and am having some trouble with exceptions. I know
> how to use the try{}catch{}finally{} stuff (or at least I think I do). But
> the error message from the compiler says:
>
> Exception java.io.IO Exception must be caught, or it must be declared in the
> throws clause of this method.
>
> What is a throws clause? How do I invoke one? The error is occuring in the
> following line of code:
>
> RandomAccessFile file = new RandomAccessFile(input, "rw");
> ^
>
>
> Thanks for any and all help
>
> Susan McDaniel
> mcdaniel@umich.edu
you need to create a RandomAccessFile in a try/catch block
try
{
RandomAccessFile file = new RandomAccessFile(input, "rw");
}
catch(IOExcpetion E)
{
// erro r code here
}
alternatively you could declare that your method "throws" an
IOException so that you do not have to deal with it in that method
but from where you called this method.
class MyObject
{
public void MyMethod() throws IOException
{
// do soem stuff
RandomAccessFile file = new RandomAccessFile(input, "rw");
// do more stuff
}
public void SomeOtherMethod()
{
try
MyMethod();
catch(IOException E)
{
//ERROR CODE HERE
}
}
}
Hope this helps,
Walt
********************************************************************************************
Walter Szewelanczyk Technical Director
Walter@adco.com NET VENTURE, Inc.
http://www.adco.com RR1 Box 1168A
(207) 737-8205 Richmond, Maine 04357
"One must stay in a very RIGID state of FLEXIBILITY"
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