unreported exception IOException; must be caught or declared to be thrown

Question

I have a question , why does java keeps throwing that exception ! Is the problem with the stream ? because I handeled all IOExceptionS !

[[jio0yh.java:12: error: unreported exception IOException; must be caught or declared to be thrown]]>>

That's the exception that I'm getting!

here is my code

import java.io.*;
public class jio0yh{

public static void main(String[]args){

 FileInputStream OD=null;

try{


   File f=new File("Binary.dat");

 OD= new FileInputStream(f);

byte[]b=new byte[(int)f.length()];

OD.read(b);

for(int i=0;i<b.length;i++)

System.out.println(b[i]);}catch(FileNotFoundException e){System.out.println
(e.getMessage());}

catch(IOException e){System.out.println(e.getMessage());OD.close();}

}}

score 1 · Answer 1 · edited May 23 '17 at 11:50

The OD.close(); in your IOException catch block is also susceptible to throwing another IOException.

You should surround the final OD.close() in a finally block:

// ... Any previous try catch code
} finally {
    if (OD != null) {
        try {
            OD.close();
        } catch (IOException e) {
            // ignore ... any significant errors should already have been
            // reported via an IOException from the final flush.
        }
    }
}

Refer to the following for a more thorough explanation:

Java try/catch/finally best practices while acquiring/closing resources

unreported exception IOException; must be caught or declared to be thrown

1 Answers1