Loop through HashMap

[Joe Man]

Can someone show me how to loop through a HashMap?
I have a HashMap that contains 20 keys and 20 values. I need to loop through all of those keys and values and display it all. may be using a for loop..
Thanks in advance..

[Michael Morris]

Hi Joe,
You need to do something like this:

  Iterator it = hashMap.values().iterator();
  while (it.hasNext()) {
      Object obj = it.next();
      ... process Object here ...
  }

You'll have to typecast the Object back to its true class like this:

 SomeClass sc = (SomeClass) obj;

Hope this helps
Michael Morris
SCJP

[Joe Man]

Thanks alot!!
I really appreciate your help..

[Jim Yingst]

If you need to know keys as well as values, then the values() method will be of limited use. Most efficient would be to use entrySet() instead, followed by getKey() and getValue().