unchecked exception

[hari krishnan]

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

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();
   }
}

[Nepomuk]

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

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