How do I access nested HashMaps in Java?

Question

I have a HashMap in Java, the contents of which (as you all probably know) can be accessed by

HashMap.get(\"keyname\");

If a have a HashMap

Answer 1

You can do it like you assumed. But your HashMap has to be templated:

Map> map = 
    new HashMap>();

Otherwise you have to do a cast to Map after you retrieve the second map from the first.

Map map = new HashMap();
((Map)map.get( "keyname" )).get( "nestedkeyname" );