• 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

private method for changing the string instance

 
Greenhorn
Posts: 5
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi, does anyone have idea why this doesnt work. I want to make a private method that will change the value of a instance variable like this:


String bla = "bla bla bla";

private void changeString (String x) { x = "eee";}

changeString(bla);


Now value of the variable bla should be "eee" but its not, it is stil "bla bla bla".
 
Marshal
Posts: 79177
377
  • Likes 1
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Welcome to the Ranch

It has to do with pass‑by‑value. The String you have inside the method is a local copy of the reference passed. When you change the reference inside the method, nothing happens to the original. There is more about it here but you will take a long time reading that thread.
 
Ranch Hand
Posts: 135
5
Eclipse IDE Postgres Database Java
  • Likes 1
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi vojin,
Welcome to Ranch. Please read this article. This will clear all your doubts and definitely give you the answer for your question.
Regards,
Jude
 
vojin djukic
Greenhorn
Posts: 5
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Thanks! Articles were very helpful.
 
Campbell Ritchie
Marshal
Posts: 79177
377
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
You're welcome
 
Don't get me started about those stupid light bulbs.
reply
    Bookmark Topic Watch Topic
  • New Topic