Java---Dictionary 字典

Note：这个抽象类有点过时了，子类必须实现接口Map

Dictionary 

抽象类，key to value，key   1对多个  value

package java.util;

子类有：HashTable

包含的方法：

abstract public int size();

abstract public boolean isEmpty();

abstract public Enumeration keys();

abstract public Enumeration elements();

abstract public V get(Object key);

abstract public V put(K key, V value);

abstract public V remove(Object key);