Win a copy of Re-engineering Legacy Software this week in the Refactoring forum
or Docker in Action in the Cloud/Virtualization forum!
  • Post Reply
  • Bookmark Topic Watch Topic
  • New Topic

HashMap Help?!

 
Tricia Yap
Greenhorn
Posts: 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
How would you check that a given key corresponds to a given object (if you stored an Object)?
And how would, given a specific key, retrieve the corresponding details of that Object?
Eg: if i have a Person with String fname, String lname, String ID (and methods to return those Strings)
in :
HashMap hm = new HashMap();
Person person = new Person();
hm.put(person.ID(), person);
How would I retrieve corresponding String fname given a specific ID??
 
Matt Siegel
Ranch Hand
Posts: 55
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Person person = (Person) hm.get(id);
String fname = person.fname();
or, in one line:
String fname = ((Person) hm.get(id)).fname();
 
  • Post Reply
  • Bookmark Topic Watch Topic
  • New Topic