• 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
  • Liutauras Vilda
  • Paul Clapham
Sheriffs:
  • paul wheaton
  • Tim Cooke
  • Henry Wong
Saloon Keepers:
  • Stephan van Hulst
  • Tim Holloway
  • Carey Brown
  • Frits Walraven
  • Piet Souris
Bartenders:
  • Mike London

How many Objects are elligible for Gabbage Collection at Line 17?

 
Greenhorn
Posts: 9
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator

1. class A{
2.
3. A a1;
4. A a2;
5.
6. public void finalize(){
7. System.out.println("-");
8. }
9.
10. public static void main(String args[]){
11. A s1=new A();
12. s1.a1=new A();
13. s1.a2=s1;
14. s1.a1.a2=new A();
15. s1.a1.a2.a2=new A();
16. s1.a1.a2.a2.a1=s1.a1;
17. s1.a2.a1.a2=null;
18. System.gc();
19. }
20.
21. }
 
Ranch Hand
Posts: 2066
IntelliJ IDE Clojure Linux
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Welcome to JavaRanch! Please => QuoteYourSources, => ShowSomeEffort, and => UseCodeTags when you post a code snaps, it will be more readable.
 
Ranch Hand
Posts: 62
Netbeans IDE Eclipse IDE Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Just for my own sanity:

 
Hrishikesh Yeshwant Alshi
Ranch Hand
Posts: 62
Netbeans IDE Eclipse IDE Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
In my opinion, two objects can be GCed.
 
Ranch Hand
Posts: 83
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
yep. 2.
 
Abimaran Kugathasan
Ranch Hand
Posts: 2066
IntelliJ IDE Clojure Linux
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Yes, answer is 2, but fir these kind of questions, draw diagrams with pencil. You can count it then.
 
Greenhorn
Posts: 12
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
why 2???
 
Ranch Hand
Posts: 76
IntelliJ IDE Spring Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
I agree with Abimaran. You can solve these types of questions easily if you draw a diagram of what is happening. I draw usually the given objects in circles and then I draw a arrow pointing to that circle. The arrows thus begins with the reference variable name and ends with the circle which represents the object. Then I delete and move the arrows as the code follows and at the desired line, I count the circles to which there are no arrows pointing to. This is the number of objects eligible for GC. I hope I wrote it understandably :-)
reply
    Bookmark Topic Watch Topic
  • New Topic