Java中KV对象的最佳实践是什么？

Question

What is the best practice for creating a single key value object in java? I know there is: Object, Pair, Map.Entry , KeyValue. For a simple KV use such as {"name":"coolName"} what should i use?

Answer 1

The most standard way to represent a key-value pair is with Map.Entry :

A map entry (key-value pair).

This is better than the others you suggest because:

• Object : has no notion of it having any meaningful structure
• Pair : better, but does not semantically convey that the first thing is a key and the second is a value.
• KeyValue : don't know what this is, but I don't think it's part of the standard SDK.

Map.Entry is in java.util , so it's available everywhere.

You can create an instance using:

new AbstractMap.SimpleEntry<>(key, value)

As pointed out by Michael , Java 9 adds a helper method :

Map.entry(key, value)

Answer 2

您可以使用Pair<K,V> （来自commons-lang3的Map.Entry<K,V>的实现）和Java 11中的相关方法： Map.entry 。