• 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

on constructor

 
Ranch Hand
Posts: 137
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
hai ranchers
why this code is giving compile time error
can any one explain


Q43.What will be the result of compiling and running the given program?
Select one correct answer.

1. class Q43
2. {
3. int y=1;
4. Q43()
5. {
6. this(y);
7. }
8. Q43(int x)
9. {
10. y=x++ + ++x;
11. }
12. public static void main(String [] args)
13. {
14. Q43 t = new Q43();
15. System.out.println(t.y);
16. }
17. }
a Program compiles correctly and prints 1 when executed.
b Program compiles correctly and prints 4 when executed.
c Compile time error.
d None of above.

by
velan vel
 
Ranch Hand
Posts: 481
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi

The code doesnot compile because the key word "this" cannot refer to any instance variable but can refer to static variables.

I had the change the code below at //////1 now it works fine and prints 4

Also remember that both this and super keyword cannot have instance variable as arguments but can have static variables.

 
Ranch Hand
Posts: 64
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi velan,

same type of question has already been asked.
see this:
https://coderanch.com/t/252273/java-programmer-SCJP/certification/Superclass-Reference

i think you and Mithran Perry are on the same page.

regards,
Harshil
reply
    Bookmark Topic Watch Topic
  • New Topic