如何存储在Java中对数组？ [英] How to store an array of pairs in java?

问题描述

我是新来的Java，我想存储对双打的数组。我的code是这样的：

I am new to java, I want to store an array of pair of doubles. My code looks like this:

import java.util.ArrayList;
import java.util.Map.Entry;

List<Entry<Double, Double>> values = new ArrayList<>();
Entry<Double, Double> pair;
// set pair values:
// pair.setKey(0.5); // this method does not exists
// pair.setValue(3.6);
values.add(pair);

我怎么能初始化对可变？
有没有更好的结构来存储我对双打的阵列？

How can I initialize the pair variable ? Is there a better structure to store my array of pair of doubles ?

推荐答案

创建自己的类来重新present一对，并添加一个构造函数有两个参数：

Create your own class to represent a pair and add a constructor that takes two arguments:

public class MyPair
{
    private final Double key;
    private final Double value;

    public MyPair(Double aKey, Double aValue)
    {
        key   = aKey;
        value = aValue;
    }

    public Double key()   { return key; }
    public Double value() { return value; }
}

看到这个答案的原因，一个对不存在于Java中：<一href=\"http://stackoverflow.com/questions/156275/what-is-the-equivalent-of-the-c-pairl-r-in-java\">What是C ++对＆LT相当于; L，R＆GT;在Java中？

See this answer for reasons why a Pair does not exist in Java: What is the equivalent of the C++ Pair<L,R> in Java?

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