• 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

Possible error OCJP Practice Exams, exam 3 question 28

 
Greenhorn
Posts: 14
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi all,

When I worked through this question, I ended up with five objects, but the answer says it's only four. It seems to me that one Banker, one Account and three Longs are created



I ran the code through the debugger in Eclipse and, indeed, Long instances are created with different IDs at lines 1,2 and 3.

Would anyone care to comment on that?

Many thanks!
-john
 
Ranch Hand
Posts: 137
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
You didn't post the exact question. If it asked you how many objects are created by the whole program that's one thing, but if it asked how many are created between certain lines that's another.

I'm going to examine how many are created just within the go() method.


I think the supplied answer, four objects, is correct if they meant just the doings within the go() method.
 
John Wintermute
Greenhorn
Posts: 14
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi Thomas,

Yes, you are indeed correct - it's how many are eligible when the method ends. Another case of "read the question properly"

thanks!

john
 
Greenhorn
Posts: 3
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
John, I think you're right. The question asks "When line 8 is reached, which are true?"

When line 8 is reached, you have those 4 objects mentioned by Thomas, plus the Banker object created in line 7 that would be eligible for GC.
That makes it five objects eligible for GC, right?
 
Greenhorn
Posts: 2
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Yes, it's 5 and was confirmed by the author here https://coderanch.com/t/531928/java-programmer-SCJP/certification/Garbage-Collection-found-OCP-Java
 
reply
    Bookmark Topic Watch Topic
  • New Topic