This week's book giveaway is in the Go forum.
We're giving away four copies of Head First Go and have Jay McGavren on-line!
See this thread for details.
Win a copy of Head First Go this week in the Go forum!
  • 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 all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Liutauras Vilda
  • Bear Bibeault
  • Paul Clapham
  • Jeanne Boyarsky
Sheriffs:
  • Devaka Cooray
  • Junilu Lacar
  • Tim Cooke
Saloon Keepers:
  • Tim Moores
  • Ron McLeod
  • Tim Holloway
  • Claude Moore
  • Stephan van Hulst
Bartenders:
  • Winston Gutkowski
  • Carey Brown
  • Frits Walraven

Mock explanations #14 of chapter 3 (Java OCA 8 Programmer I Study Guide)  RSS feed

 
Ranch Hand
Posts: 207
27
Java jQuery Netbeans IDE
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi,

When I check my answers for review questions of chapter 3 I saw that my answer of #14 question is correct. But I look at explanation of this question I know that I think wrong in really. Because I forget one detail in this question. I remember substring don't change StringBuilder when I saw explanation. If option B returns "avaJ" I would choose it as correct answer. If we run this code we saw that option B returns "Java" so I didn't consider it as correct answer.
But explanation of #14 is written:

Option B is a nice distraction it does in fact return "avaJ". However, substring() returns a String, which is not stored anywhere.


Probably authors forget to put comment puzzle.reverse(); when run this code.
 
Sheriff
Posts: 11604
178
AngularJS Chrome Eclipse IDE Hibernate Java jQuery MySQL Database Spring Tomcat Server
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
The answers given in the book are correct: A and C will print the required avaJ.

The explanation why B is wrong, is wrong itself If you would print the String returned by option B Java is indeed printed and not avaJ. Therefore it's definitely an incorrect answer (as mentioned in the book). But with the code as-is it's also not a nice distraction as the book suggests. To be a nice distraction option B should be replaced withWith this statement the explanation why B is wrong, would be correct.

And what about the last part of the eplanation of this question: and length() counts starting with 1? Does length() not start with 0? Although I understand what's meant here, I wonder if it would not be better (as in more obvious/clear) to just state that length() just returns the character count.

 
author & internet detective
Posts: 39175
724
Eclipse IDE Java VI Editor
 
Don't get me started about those stupid light bulbs.
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!