Java Hashtable

创建: 2020/11/21

完成: 2020/11/21

 

https://docs.oracle.com/javase/8/docs/api/java/util/Hashtable.html

 

构造函数

Hashtable<K, V>()
Hashtable<K, V>(int n)
Hashtable<K, V>(int n, float lf)	n: size lf: load factor

实例函数

void clear()

判断

boolean isEmpty()
boolean contains(Object v) throws NullPointerException	对比的是value不是key
boolean containsKey(Object k)
boolean containsValue(Object v)

Enumeration<K> keys()

Enumeration<V> elements()

Object get(Object k) 

Object put(K k, V v) throws NullPointerException

• k或v为null是抛出异常

V remove(Object k)

 返回的是value, 不带key

int size()

String toString()