JAVA如何按空间拆分并存储为双数组

Question

如何从文本文件读取数据，将每个单词/数字拆分并存储到数组中？

Answer 1

You should read the line of from the file as a String, split that and convert to double. Try this:

    try {
        Scanner scan = new Scanner(new File("path/to/file"));

        String str = scan.nextLine();

        String[] split = str.split("\\s+");

        // remove first element
        String[] x = new String[split.length-1];
        for (int i = 0; i < x.length; i++) {
            x[i] = split[i+1];
        }

        double[] numbers = new double[x.length];
        for (int i = 0; i < x.length; i++) {
            numbers[i] = Double.parseDouble(x[i]);
        }


    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }

I also added a bit to remove the first element since is not a double . You could condense the two for-loops together, avoiding having a separate x-array. This can be done as follows:

        String[] split = str.split("\\s+");

        // create double array while ignoring the first element 
        double[] numbers = new double[split.length-1];
        for (int i = 0; i < numbers .length; i++) {
            numbers[i] = Double.parseDouble(split[i+1]);
        }