java - 分割数字对的字符串，然后在java中分割它们中的每一个

Question

假设我有以下行:

ball_velocities:45,500 46,500 47,500

我愿意:

• 将这些对分开
• 将数字对本身和其中的数字分开在我已有的函数中使用这两个数字

   String[] numbers = data.split("\\\\s+");
   if (numbers.length > 0) {
            List<Velocity> velocities = new ArrayList<>();
         for (String number : numbers) {
             try {
                 int firstNum = Integer.parseInt(number);
                      int secondNum = Integer.parseInt(number);
                velocities.add(Velocity.pair(firstNum,secondNum));

我知道我搞砸了，所以我很高兴听到一些建议。

我认为这非常简单，我所要做的就是像我已经做的那样按空格进行 data.split数据再次用逗号分割，然后我不知道如何将这两个数字组合成一个函数。

我的意思是最终我希望它是:包含以下值的速度列表:

Velocity.pair(45,500)
Velocity.pair(46,500)
Velocity.pair(47,500)

谢谢。

Answer 1

假设类(class) Velocity看起来像这样:

class Velocity {
    private int firstNumber;
    private int secondNumber;

    public Velocity(int firstNumber, int secondNumber) {
        super();
        this.firstNumber = firstNumber;
        this.secondNumber = secondNumber;
    }

    public int getFirstNumber() {
        return firstNumber;
    }

    public void setFirstNumber(int firstNumber) {
        this.firstNumber = firstNumber;
    }

    public int getSecondNumber() {
        return secondNumber;
    }

    public void setSecondNumber(int secondNumber) {
        this.secondNumber = secondNumber;
    }

    public String toString() {
        return "[" + firstNumber + ", " + secondNumber + "]";
    }
}

你基本上必须一步一步进行:

1. 删除介绍标签ball_velocities:来自String你想 split ，
2. split结果由任意数量的空格组成，然后
3. split每个结果都用逗号表示，
4. 将结果解析为 int s
5. 实例化 Velocity以及解析结果，最后
6. 添加 Velocity 的每个实例到List<Velocity>

可以按如下方式完成，例如:

public static void main(String[] args) throws ParseException {
    String data = "ball_velocities:45,500 46,500 47,500";

    List<Velocity> velocities = new ArrayList<>();
    // remove the intro tag and then split by whitespace(s)
    String[] numberPairs = data.replace("ball_velocities:", "").split("\\s+");

    // handle each result (which still consists of two numbers separated by a comma
    for (String numberPair : numberPairs) {
        // that means, split again, this time by comma
        String[] numbers = numberPair.split(",");
        // parse the results to ints
        int firstNum = Integer.parseInt(numbers[0]);
        int secondNum = Integer.parseInt(numbers[1]);
        // instantiate a new Velocity with the results and add it to the list
        velocities.add(new Velocity(firstNum, secondNum));
    }

    // print the list using the `toString()` method of Velocity
    velocities.forEach(System.out::println);
}

此示例将打印

[45, 500]
[46, 500]
[47, 500]