Win a copy of Microservices Testing (Live Project) this week in the Spring 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 Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Tim Cooke
  • Ron McLeod
  • Jeanne Boyarsky
  • Paul Clapham
Sheriffs:
  • Liutauras Vilda
  • Henry Wong
  • Devaka Cooray
Saloon Keepers:
  • Tim Moores
  • Stephan van Hulst
  • Tim Holloway
  • Al Hobbs
  • Carey Brown
Bartenders:
  • Piet Souris
  • Mikalai Zaikin
  • Himai Minh

mock exam question on repaint

 
Ranch Hand
Posts: 94
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi Friends,
Thi is a question from MindQ mock exam.
Which of the following describe the sequence of method calls that result in a component being redrawn?
a) invoke paint() directly
b) invoke update which calls paint()
c) invoke repaint() which invokes update(), which in turn invokes paint()
d) invoke repaint() which invokes paint directly
I think option c is right. Please confirm.
and also when I click link to see answer key, the link doesn't work and takes me to Javaranch site. Please suggest how to check answer key.
Regards
Jyotsna

 
Author and all-around good cowpoke
Posts: 13078
6
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Actually, none of those is precisely correct.
Calling repaint() registers the request to have the component repainted with the JVM, entirely indirectly. The JVM has a stack of these requests.
When the JVM gets around to it, the Thread devoted to event handling is used to call the Component update method, which normally calls paint. However, update can be overriden also.
Bill

------------------
author of:
 
arch rival
Posts: 2813
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Even better, this topic does not come up on the Programmers Certification exam (it used to on an older version).
Marcus
 
Consider Paul's rocket mass heater.
reply
    Bookmark Topic Watch Topic
  • New Topic