aspose file tools*
The moose likes Beginning Java and the fly likes HashMap Help?! Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login


Win a copy of EJB 3 in Action this week in the EJB and other Java EE Technologies forum!
JavaRanch » Java Forums » Java » Beginning Java
Bookmark "HashMap Help?!" Watch "HashMap Help?!" New topic
Author

HashMap Help?!

Tricia Yap
Greenhorn

Joined: Aug 26, 2001
Posts: 1
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

Joined: Jul 18, 2000
Posts: 55
Person person = (Person) hm.get(id);
String fname = person.fname();
or, in one line:
String fname = ((Person) hm.get(id)).fname();
 
 
subject: HashMap Help?!
 
Similar Threads
Hashmap doubt from K&B
Front controller and DAO, design question!
HashMap and its cousins
how hashmap identify the duplicate values? (i need internal logic)
Map, Hashmap: when would one use them?