Java 如何获取 HashTable 值作为 Arraylist？
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how to get HashTable values as Arraylist?
提问by Radi
Hashtable hw
哈希表硬件
How can I convert its values to:
如何将其值转换为：
ArrayList <Word> arr
thanks.
谢谢。
采纳答案by jjnguy
Use the ArrayListconstructor that takes a collection.
使用ArrayList接受集合的构造函数。
ArrayList<Word> arr = new ArrayList<Word>(hw.values());
Then every value that was in the HashTablewill be in the new ArrayList.
然后，在 中的每个值HashTable都将在新的ArrayList.
You can find documentation about the constructor in the javadocs.
您可以在javadocs 中找到有关构造函数的文档。
回答by karoberts
ArrayList<Word> arr = new ArrayList<Word>( hw.values() );
回答by Rakesh Juyal
use
用
hw.values();
it will simply return the Collection (like a List) of Wordobjects.
它将简单地返回对象的集合（如列表）Word。
from javadocs
来自 javadocs
values
价值观
public Collection values()
公共集合值()
Returns a Collection view of the values contained in this map. The collection is backed by the map, so changes to the map are reflected in the collection, and vice-versa. If the map is modified while an iteration over the collection is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. The collection supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Collection.remove, removeAll, retainAll and clear operations. It does not support the add or addAll operations.
返回此映射中包含的值的集合视图。集合由地图支持，因此对地图的更改会反映在集合中，反之亦然。如果在对集合进行迭代时修改了映射（通过迭代器自己的删除操作除外），则迭代的结果是不确定的。该集合支持元素移除，通过 Iterator.remove、Collection.remove、removeAll、retainAll 和 clear 操作从地图中移除相应的映射。它不支持 add 或 addAll 操作。
回答by Simon K. Gerges
Also you can use
你也可以使用
ArrayList<Word> arr = Collections.list(hw.keys());
for keys as ArrayList
对于键作为 ArrayList
