• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Jeanne Boyarsky
  • Ron McLeod
  • Paul Clapham
  • Liutauras Vilda
Sheriffs:
  • paul wheaton
  • Rob Spoor
  • Devaka Cooray
Saloon Keepers:
  • Stephan van Hulst
  • Tim Holloway
  • Carey Brown
  • Frits Walraven
  • Tim Moores
Bartenders:
  • Mikalai Zaikin

Doubt with Dan's Mock exam - Flow Control & Exception Handling Q7

 
Ranch Hand
Posts: 61
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Can somebody explain why the result comes out this way.
class Level1Exception extends Exception {}
class Level2Exception extends Level1Exception {}
class Level3Exception extends Level2Exception {}
class Brown {
public static void main(String args[]) {
int a, b, c, d, f;
a = b = c = d = f = 0;
int x = 1;
try {
switch (x) {
case 1: throw new Level1Exception();
case 2: throw new Level2Exception();
case 3: throw new Level3Exception();
}
a++;
}
catch (Level3Exception e) { b++;}
catch (Level2Exception e) { c++;}
catch (Level1Exception e) { d++;} // Doubt
finally {f++;}
System.out.print(a+","+b+","+c+","+d+","+f);
}
}
Answer is 0,0,0,1,1
My question is why is that only the catch(Level1Exception e) is handling inspite of the case 2 and 3 statements throwing Level2Exception and Level3Exception respectively. Is it because Level1Exception is the super class?
 
Ranch Hand
Posts: 257
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
When Level1Exception is thrown, it does not execute the following statements, the compiler searches for a handler to handle the exception. Since it is Level1Exception that is thrown handler for Level1Exception is invoked.
 
Priya Venkatesan
Ranch Hand
Posts: 61
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Thank You. I got it.
 
Ranch Hand
Posts: 203
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
When ever an exception is thrown the following code is completely skipped and next executed statement is catch block. If catch block is not present for the current try block compiler searches for finally block. If finally is found then it is executed and compiler searches for catch blocks if any are present in the nested try block....
try{
// throw exception
try{
}
finally{
// don't return here. We still have some work..
}
catch{
// this is executed for the above exception
}
}
[ March 10, 2003: Message edited by: Sarma Lolla ]
 
incandescent light gives off an efficient form of heat. You must be THIS smart to ride this ride. Tiny ad:
a bit of art, as a gift, the permaculture playing cards
https://gardener-gift.com
reply
    Bookmark Topic Watch Topic
  • New Topic