如何拆分字符串序列并将每个元素转换为double

Question

我遇到了编程课的问题。我们需要在逗号中分隔参数String以生成一个字符串数组，然后它需要解析每个单独的String以获得一个double，并按顺序存储这些双精度数。我们还给出了一些测试代码，输入参数如（＆＃34; 1,5＆＃34;）。

这是我目前的代码

public class Sequence
{

private double[] sequence;

public Sequence(String s)
{ 
  String[] res = s.split(",");

  int length = res.length;

  double[] result = new double[length];

  for ( int i =0; i<length; i++) {

  result[i] = Double.parseDouble(res[i])

  }

 }

我不确定从哪里开始，因为当我测试我的代码时，它会给出预期的结果。按顺序存储是什么意思？

Answer 1

我已经更新了我的答案，这可能就是你要找的东西：

import java.util.Arrays;

public class Four {

    public static void main(String[] args) {

        String string = "1,2,10,4,9";

        System.out.println(string);

        double[] ds = getDouble(string);

        for (int i = 0; i < ds.length; i++) {
            System.out.println(ds[i]);
        }

    }

    private static double[] getDouble(String string) {
        double[] _double;
        String[] _Strings = string.split(",");

        _double = new double[_Strings.length];

        for (int i = 0; i < _Strings.length; i++) {
            _double[i] = Double.parseDouble(_Strings[i]);
        }
        Arrays.sort(_double);
        return _double;
    }

}

输出

Answer 2

我会这样做：

public class Sequence {

    private double[] sequence;

    public void createSequence(int sequenceLength) {
        sequence = new double[sequenceLength];
    }

    public void addToSequence(int index, double value) {
        sequence[index] = value;
    }

    public double parseDouble(String s) {
        return Double.parseDouble(s);
    }

    public String[] splitString(String s) {
        return s.split(",");
    }

    @Override
    public String toString() {
        return Arrays.toString(sequence);
    }

    public static void main(String[] args) {
        String str = "10.10,20.20,30.30";

        Sequence sequence = new Sequence();
        String[] splitted = sequence.splitString(str);
        sequence.createSequence(splitted.length);

        for (int i = 0; i < splitted.length; i++) {
            double doubleValue = sequence.parseDouble(splitted[i]);
            sequence.addToSequence(i, doubleValue);
        }

        System.out.println(sequence);
    }
}

Answer 3

将private double[] sequence;更改为private Double[] sequence;  并使用下面的代码

public class Sequence {

    private Double[] sequence;

    public Sequence(String s) {
        String separated[] = s.replace(" ", "").split(",");
        ArrayList<Double> list = new ArrayList<>();
        for (String num : separated) {
            list.add(Double.parseDouble(num));
        }
        this.sequence = list.toArray(new Double[separated.length]);
    }

}