Java将ArrayList转换为int数组 [英] Java convert ArrayList to int array

问题描述

我想将我的arraylist转换为一个double array []. 为什么我不能使用这种方法进行投射，这是怎么回事?

I want to convert my arraylist to a double array[]. Why can't I cast with this method, what is wrong?

public static void convert(ArrayList list, double array[]) {



    array = new double [list.size()];

    for (int x = 0; x < list.size(); x++) {

        array[x]=(double) list.get(x);

    }

}

我收到此错误消息

String cannot be cast to java.lang.Double

如果我将fropm原始类型ArrayList更改为Double，那么我就没有这种和平的代码，也许是建议更改此代码?

I have this peace of code that does not work if I change fropm raw type ArrayList to Double, maybe suggestions to change this code?

getTest().addAll(Arrays.asList(line.split(",")));

推荐答案

使用此:

array[x]=Double.parseDouble(list.get(x));

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