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java.util
Class Dictionary
java.lang.Objectjava.util.Dictionary
- Direct Known Subclasses:
- Hashtable
- public abstract class Dictionary
- extends java.lang.Object
A Dictionary maps keys to values; how it does that is implementation-specific. This is an abstract class which has really gone by the wayside. People at Javasoft are probably embarrassed by it. At this point, it might as well be an interface rather than a class, but it remains this poor, laughable skeleton for the sake of backwards compatibility. At any rate, this was what came before the Map interface in the Collections framework.
- Since:
- 1.0
| Constructor Summary | |
Dictionary()
Sole constructor (often called implicitly). |
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| Method Summary | |
abstract Enumeration |
elements()
Returns an Enumeration of the values in this Dictionary. |
abstract java.lang.Object |
get(java.lang.Object key)
Returns the value associated with the supplied key, or null if no such value exists. |
abstract boolean |
isEmpty()
Returns true when there are no elements in this Dictionary. |
abstract Enumeration |
keys()
Returns an Enumeration of the keys in this Dictionary |
abstract java.lang.Object |
put(java.lang.Object key,
java.lang.Object value)
Inserts a new value into this Dictionary, located by the supplied key. |
abstract java.lang.Object |
remove(java.lang.Object key)
Removes from the Dictionary the value located by the given key. |
abstract int |
size()
Returns the number of values currently in this Dictionary. |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
Dictionary
public Dictionary()
- Sole constructor (often called implicitly).
| Method Detail |
elements
public abstract Enumeration elements()
- Returns an Enumeration of the values in this Dictionary.
get
public abstract java.lang.Object get(java.lang.Object key)
- Returns the value associated with the supplied key, or null
if no such value exists. Since Dictionaries are not allowed null keys
or elements, a null result always means the key is not present.
isEmpty
public abstract boolean isEmpty()
- Returns true when there are no elements in this Dictionary.
keys
public abstract Enumeration keys()
- Returns an Enumeration of the keys in this Dictionary
put
public abstract java.lang.Object put(java.lang.Object key, java.lang.Object value)
- Inserts a new value into this Dictionary, located by the
supplied key. Dictionary does not support null keys or values, so
a null return can safely be interpreted as adding a new key.
remove
public abstract java.lang.Object remove(java.lang.Object key)
- Removes from the Dictionary the value located by the given key. A null
return safely means that the key was not mapped in the Dictionary.
size
public abstract int size()
- Returns the number of values currently in this Dictionary.
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