Dictionary抽象类源码解析

package java.util;

public abstract
class Dictionary<K,V> {

public Dictionary() {
}

abstract public int size();

abstract public boolean isEmpty();

abstract public Enumeration<K> keys(); // 枚举类型 ,在Map中是 set类型

abstract public Enumeration<V> elements();// 枚举类型

abstract public V get(Object key);

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

abstract public V remove(Object key);
}