This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
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??