Exceptions in Finally section

[satish]

Java tutorial mentions that one of the uses of Finally section is to close any open IO streams. That's what I did in the following code. However, I get "IoTest2.java [30:1] unreported exception java.io.IOException; must be caught or declared to be thrown" error when I compile the code. How should I hadle exceptions thrown in Finally section?

import java.io.*;
public class IoTest2 {

/** Creates a new instance of IoTest2 */
public IoTest2() {
}

public static void main(String[] args){

File f1 = new File("c:\\testfile");
FileReader in = null;
try {
f1.createNewFile();
in = new FileReader(f1);
} catch(IOException e) {
System.out.println(e.getMessage());
} finally {
in.close();
}
}
}

[David Harkness]

Originally posted by satish:
How should I hadle exceptions thrown in Finally section?

The same way you handle them anywhere else: catch them or declare that they will be thrown from the method. Since you print the message of any IOException that occurs while using the file, you may as well do the same when closing it.

finally {
    try {
        in.close();
    }
    catch ( IOException e ) {
        System.out.println(e.getMessage());
        // or
        e.printStackTrace();
    }
}

[satish kumar]

Thank you. If out1.close() fails, system goes to catch block and out2 remains open...right? Should there be another finally?

finally{
try {
out1.close();
out2.close();
} catch (IOException e) {
System.out.println(e.getMessage());
}

}

[Pritam Barhate]

no there is no need of another finally. Rather you should use two seperate try{}catch(){} blocks for each of the two close() calls.

  
finally{
try{
out1.close();
}catch(IOException ioe){
System.out.println(ioe.getMessage());
}
 
try{
out2.close();
}catch(IOException ioe1){
System.out.println(ioe.getMessage());
}
 
}