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java.lang.Object | +----java.util.Dictionary
Dictionary class is the abstract parent of any
class, such as Hashtable, which maps keys to values.
Any non-null object can be used as a key and as a value.
As a rule, the equals method should be used by
implementations of this class to decide if two keys are the same.
key to the specified
value in this dictionary.
key (and its corresponding
value) from this dictionary.
public Dictionary()
public abstract int size()
public abstract boolean isEmpty()
true if this dictionary maps no keys to values;
false otherwise.
public abstract Enumeration keys()
public abstract Enumeration elements()
public abstract Object get(Object key)
null if the key is not mapped to any value in
this dictionary.
public abstract Object put(Object key,
Object value)
key to the specified
value in this dictionary. Neither the key nor the
value can be null.
The value can be retrieved by calling the
get method with a key that is equal to
the original key.
key was mapped
in this dictionary, or null if the key did not
have a previous mapping.
key or
value is null.
public abstract Object remove(Object key)
key (and its corresponding
value) from this dictionary. This method does nothing
if the key is not in this dictionary.
key had been mapped in this
dictionary, or null if the key did not have a
mapping.
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