Win a copy of Testing JavaScript Applications this week in the HTML Pages with CSS and JavaScript 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
  • Bear Bibeault
  • Ron McLeod
  • Jeanne Boyarsky
  • Paul Clapham
Sheriffs:
  • Tim Cooke
  • Liutauras Vilda
  • Junilu Lacar
Saloon Keepers:
  • Tim Moores
  • Stephan van Hulst
  • Tim Holloway
  • fred rosenberger
  • salvin francis
Bartenders:
  • Piet Souris
  • Frits Walraven
  • Carey Brown

HashMap Duplicate Key should give error?

 
Ranch Hand
Posts: 226
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
the following code should have given me error for "duplicate" key. but it is not giving. why?

 
Ranch Hand
Posts: 99
Android Tomcat Server Java
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
It is just replacing the value mapped by key 'word'. It is not creating any new entry in map.

After first call of put method a mapping is created.
And for any subsequent call to put method if the map contained a mapping for key, the old value is replaced.
 
Em Aiy
Ranch Hand
Posts: 226
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

Anuj Prashar wrote:It is just replacing the value mapped by key 'word'. It is not creating any new entry in map.


but it should give error "duplicate entry" (word). isn't it so ?
 
Anuj Prashar
Ranch Hand
Posts: 99
Android Tomcat Server Java
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
check this this

After first call, subsequent call to put method will replace old value if mapping for key you are using in your put method already exist.
 
Evil is afoot. But this tiny ad is just an ad:
Building a Better World in your Backyard by Paul Wheaton and Shawn Klassen-Koop
https://coderanch.com/wiki/718759/books/Building-World-Backyard-Paul-Wheaton
    Bookmark Topic Watch Topic
  • New Topic