在Java中使用Pairs或2元组 [英] Using Pairs or 2-tuples in Java

问题描述

Java中的Hashtable将受益于具有元组结构的值。我可以在Java中使用哪种数据结构？

My Hashtable in Java would benefit from a value having a tuple structure. What data structure can I use in Java to do that?

Hashtable<Long, Tuple<Set<Long>,Set<Long>>> table = ...

推荐答案

我不认为那里是Java中的通用元组类，但自定义元组可能如下所示：

I don't think there is a general purpose tuple class in Java but a custom one might be as easy as the following:

public class Tuple<X, Y> { 
  public final X x; 
  public final Y y; 
  public Tuple(X x, Y y) { 
    this.x = x; 
    this.y = y; 
  } 
} 

当然，有一些重要的含义如何进一步设计这个类关于相等性，不变性等，特别是如果你打算使用实例作为散列的关键。

Of course, there are some important implications of how to design this class further regarding equality, immutability, etc., especially if you plan to use instances as keys for hashing.

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