Will catch ( EOFException eof ) catch an IOException that is not an EOFException?

A good answer might be:

No.

Since EOFException is a subclass of IOException the catch block will not catch the latter. But readInt() may throw an IOException and it must be caught somewhere. Here is an attempt to finish the loop:

      // Loop with problems

      try
      {
        while ( true )
          sum += instr.readInt();
      }

      catch ( EOFException  eof )
      {
        System.out.println( "The sum is: " + sum );
        instr.close();
      }

      catch ( IOException  eof )
      {
        System.out.println( "Problem reading input" );
        instr.close();
      }

This is syntactically correct. It is OK to have several catch{} blocks with the most specific exceptions listed first. But there is a problem.

QUESTION 9:

Does DataInputStream.close() throw an exception? (Look at the documentation ).