Common Types

Some common types are named differently in C# than in Java.

Java name	C# name	Notes
boolean	bool	C# uses a shorter name
String	string	While String also works in C#, string is preferred
ArrayList<T>	List<T>
List<T>	IList<T>	Interfaces for lists
HashMap<K, V>	Dictionary<K, V>
Map<K, V>	IDictionary<K, V>	Interfaces for maps/dictionaries

Note that List<T> is class implementing the interface IList<T> and Dictionary<K, V> implements IDictionary<K, V>.