Java:

HashMap<Integer, String> m = new HashMap<>();
m.put(1, "one");

C#:

Dictionary<int, string> d = new Dictionary<int, string>();
d.Add(1, "one");

Okay, fine so far...

Java:

String s = m.get(1);

C#:

String s;
m.TryGetValue(1, out s);

#wat #CSharp