看JDK说明
Set<K> keySet()
Returns a Set view of the keys contained in this map.
Collection<V> values()
Returns a Collection view of the values contained in this map.
返回类型,直接说明问题,返回键集合是set,返回值集合是Collection(很明显JDK意思是:不排除重复)[/quote]
好解释
看JDK说明
Set<K> keySet()
Returns a Set view of the keys contained in this map.
Collection<V> values()
Returns a Collection view of the values contained in this map.
返回类型,直接说明问题,返回键集合是set,返回值集合是Collection(很明显JDK意思是:不排除重复)