java java中的键值对实现？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/16733138/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
key value pair implementation in java?
提问by gurehbgui
Is there something like a KeyValuePairin Java?
KeyValuePairJava中有类似的东西吗？
I have a Very long list of elements of the following class:
我有一个很长的以下类的元素列表：
public class Foo {
int id;
Set<String> items;
}
which is stored here:
存储在这里：
LinkedList<Foo> myList;
each time I search for a item, I iterate over the list and search for the Item, but this takes to much time. I want to do something like this:
每次我搜索一个项目时，我都会遍历列表并搜索该项目，但这需要很多时间。我想做这样的事情：
myList.get(123) => items of the Foo with id = 123
回答by PSR
You can use Mapin Java for that purpose. It will allow key, value pairs.
Map为此，您可以在 Java 中使用。它将允许键值对。
Map<Integer,Set<String>> map = new HashMap<Integer,Set<String>>();
Adding item to map
将项目添加到地图
Set<String> set = new HashSet<String>();
set.add("ABC");
set.add("DEF");
map.put(123,set);
Getting item from map
从地图中获取物品
map .get(123) will give Set<String> associated with id 123
回答by Konstantin Yovkov
回答by Petros Tsialiamanis
I think the MultiMap<Integer,String>is suitable in your case.
我认为MultiMap<Integer,String>适合您的情况。
回答by AlexWien
you would need a so called MultiMap, java dont has that by default, but you always can use a Map for that purpose.
您将需要一个所谓的 MultiMap，默认情况下 java 没有，但您始终可以为此目的使用 Map。
Try using a HashMap<Integer, Set<String>>
尝试使用 HashMap<Integer, Set<String>>
