File	Doc	Category	Size	Date	Package
Dictionary.java	API Doc	Java SE 5 API	5589	Fri Aug 26 14:57:22 BST 2005	java.util

Dictionary

• java.lang.Object

Fields Summary

Constructors Summary
public Dictionary() Sole constructor. (For invocation by subclass constructors, typically implicit.)

Methods Summary
public abstract java.util.Enumeration	elements() Returns an enumeration of the values in this dictionary. The general contract for the elements method is that an Enumeration is returned that will generate all the elements contained in entries in this dictionary. return an enumeration of the values in this dictionary. see java.util.Dictionary#keys() see java.util.Enumeration
public abstract V	get(java.lang.Object key) Returns the value to which the key is mapped in this dictionary. The general contract for the isEmpty method is that if this dictionary contains an entry for the specified key, the associated value is returned; otherwise, null is returned. return the value to which the key is mapped in this dictionary; param key a key in this dictionary. null if the key is not mapped to any value in this dictionary. exception NullPointerException if the key is null. see java.util.Dictionary#put(java.lang.Object, java.lang.Object)
public abstract boolean	isEmpty() Tests if this dictionary maps no keys to value. The general contract for the isEmpty method is that the result is true if and only if this dictionary contains no entries. return true if this dictionary maps no keys to values; false otherwise.
public abstract java.util.Enumeration	keys() Returns an enumeration of the keys in this dictionary. The general contract for the keys method is that an Enumeration object is returned that will generate all the keys for which this dictionary contains entries. return an enumeration of the keys in this dictionary. see java.util.Dictionary#elements() see java.util.Enumeration
public abstract V	put(K key, V value) Maps the specified key to the specified value in this dictionary. Neither the key nor the value can be null. If this dictionary already contains an entry for the specified key, the value already in this dictionary for that key is returned, after modifying the entry to contain the new element. If this dictionary does not already have an entry for the specified key, an entry is created for the specified key and value, and null is returned. The value can be retrieved by calling the get method with a key that is equal to the original key. param key the hashtable key. param value the value. return the previous value to which the key was mapped in this dictionary, or null if the key did not have a previous mapping. exception NullPointerException if the key or value is null. see java.lang.Object#equals(java.lang.Object) see java.util.Dictionary#get(java.lang.Object)
public abstract V	remove(java.lang.Object key) Removes the key (and its corresponding value) from this dictionary. This method does nothing if the key is not in this dictionary. param key the key that needs to be removed. return the value to which the key had been mapped in this dictionary, or null if the key did not have a mapping. exception NullPointerException if key is null.
public abstract int	size() Returns the number of entries (distinct keys) in this dictionary. return the number of keys in this dictionary.