unchecked exception

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • hari krishnan
    New Member
    • Jun 2011
    • 5
    #1

    unchecked exception

    why unchecked exception raise while run this program. if i tack it out (throws Exeception ) this code will work well .


    Code:
    interface Foldable {
	 public void fold() throws Exception ;

}


class Paper implements Foldable {
	public void fold() { 
          System.out.print("Fold");
        }
}


public class Tester {
   public static void main(String args []) {
          Foldable obj1 = new Paper();
          obj1.fold(); 
          Paper obj2 = new Paper(); 
          obj2.fold();
   }
}
    Last edited by Niheel; Jun 26 '11, 09:42 PM.
    Tags: None
    • Nepomuk
      Recognized Expert Specialist
      • Aug 2007
      • 3111
      #2
      In short, every Exception has to be caught by a try-catch block or passed on to the next higher instance. This is true, even if there's just a possibility that an Exception might be thrown but never is.
      So, if you change the main function to
      Code:
      try {
   Foldable obj1 = new Paper();
   obj1.fold(); 
   Paper obj2 = new Paper(); 
   obj2.fold();
} catch (Exception e) {
   System.err.println("Exception was thrown");
}
      then you shouldn't have any problems.

      For more information, check out the article I wrote about exceptions.

      Greetings,
      Nepomuk

        Comment

        Previous template Next
        Working...