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public abstract class gj.util.Dictionary<A, B>

(source file: util/Dictionary.java)

java.lang.Object
   |
   +----gj.util.Dictionary<A, B>

The pure class interface.

public abstract class Dictionary<A, B>

The Dictionary class is the abstract parent of Hashtable, which maps keys to values. Any object can be used as a key and/or value.


See also:: pizza.util.Hashtable, hashCode, equals

Dictionary()

elements(): Returns an enumeration of the elements
get(A): Gets the object associated with the specified key in the Dictionary.
isEmpty(): Returns true if the Dictionary contains no elements.
keys(): Returns an enumeration of the Dictionary's keys.
put(A, B): Puts the specified element into the Dictionary, using the specified key
remove(A): Removes the element corresponding to the key
size(): Returns the number of elements contained within the Dictionary

Dictionary

public Dictionary();

size

public abstract int size();

Returns the number of elements contained within the Dictionary.

isEmpty

public abstract boolean isEmpty();

Returns true if the Dictionary contains no elements.

keys

public abstract Enumeration<A> keys();

Returns an enumeration of the Dictionary's keys.


See also:: elements, Enumeration

elements

public abstract Enumeration<B> elements();

Returns an enumeration of the elements. Use the Enumeration methods on the returned object to fetch the elements sequentially.


See also:: keys, Enumeration

get

public abstract B get(A key);

Gets the object associated with the specified key in the Dictionary.


Parameters:: key - the key in the hash table @returns the element for the key, or null if the key is not defined in the hash table.
See also:: put

put

public abstract B put(A key,
                      B value);

Puts the specified element into the Dictionary, using the specified key. The element may be retrieved by doing a get() with the same key. The key and the element cannot be null.

Parameters:

key - the specified hashtable key

value - the specified element

Returns:

the old value of the key, or null if it did not have one.

Throws:

NullPointerException -If the value of the specified element is null.

See also:

get

remove

public abstract B remove(A key);

Removes the element corresponding to the key. Does nothing if the key is not present.


Parameters:: key - the key that needs to be removed
Returns:: the value of key, or null if the key was not found.


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public abstract class gj.util.Dictionary<A, B>

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