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package pizza.util

public interface Enumeration<A> (pure interface)
The Enumeration interface specifies a set of methods that may be used to enumerate, or

public abstract class Dictionary<A, B> (pure interface)
The Dictionary class is the abstract parent of Hashtable, which maps keys to values
public class EmptyEnumerator<A> (pure interface)
A class for the empty enumerator, which yields no elements
public abstract class Enumerator<A> (pure interface)
an abstract class for implementations of the Enumeration interface
public class Hashtable<A, B> (pure interface)
Hashtable class
public class Option<A> (pure interface)
public class Set<A> (pure interface)
public class SingletonEnumerator<A> (pure interface)
A class for the empty enumerator, which yields no elements
public class Stack<A> (pure interface)
A stack class
public class Vector<A> (pure interface)
Vector class (a growable array).


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