在 ArrayList 中的单个索引处添加多个值 [英] Adding Multiple Values in ArrayList at a single index

问题描述

我在 java 中有一个双 ArrayList 像这样.

I have a double ArrayList in java like this.

List<double[]> values = new ArrayList<double[]>(2);

现在我想做的是通过循环在列表的零索引中添加 5 个值，在索引 1 中添加 5 个值.

Now what I want to do is to add 5 values in zero index of list and 5 values in index one through looping.

第零个索引的值是 {100,100,100,100,100}索引 1 的值是 {50,35,25,45,65}

The zeroth index would have values {100,100,100,100,100} The index 1 would have values {50,35,25,45,65}

并且所有这些值都按照以下顺序存储在一个双数组中

and all of these values are stored in a double array in following order

double[] values = {100,50,100,35,100,25,100,45,100,65}

我该怎么做?

推荐答案

@Ahamed 有一个观点，但如果你坚持使用列表，那么你可以像这样拥有三个数组列表:

@Ahamed has a point, but if you're insisting on using lists so you can have three arraylist like this:

ArrayList<Integer> first = new ArrayList<Integer>(Arrays.AsList(100,100,100,100,100));
ArrayList<Integer> second = new ArrayList<Integer>(Arrays.AsList(50,35,25,45,65));
ArrayList<Integer> third = new ArrayList<Integer>();

for(int i = 0; i < first.size(); i++) {
      third.add(first.get(i));
      third.add(second.get(i));
}

如果您的列表中有以下这些值:

If you have those values on your list that below:

List<double[]> values = new ArrayList<double[]>(2);

您想做的是将它们组合起来，对吗?你可以尝试这样的事情:(我假设两个数组的大小相同，否则您需要使用两个 for 语句)

what you want to do is combine them, right? You can try something like this: (I assume that both array are same sized, otherwise you need to use two for statement)

ArrayList<Double> yourArray = new ArrayList<Double>();
for(int i = 0; i < values.get(0).length; i++) {
    yourArray.add(values.get(0)[i]);
    yourArray.add(values.get(1)[i]);
}

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