如何使用 Java 扫描仪从同一行保存字符串、双精度和 Integer？

Question

I have a.txt file where each line is formatted like so...

pizza very cheesy 12.30 3 (each "item" is separated by a double space)

I tried using String[] itemInfo = scn.nextLine().split("\s "); but that creates an array of each item as a String.

I need to save "pizza" and "very cheesy" as Strings , 12.30 as a Double , and 3 as Integer . Any suggestions would be much appreciated.

Cheers!

Answer 1

Call scanner.useDelimiter(" "); before you start reading. That's TWO space characters between the quotes. That way, your scanner will interpret the double space as the delimiter.

Then you can use scanner.next() for each of the name and the description, as well as scanner.nextDouble() and scanner.nextInt() after that.

Don't forget to use scanner.nextLine() to consume the new line at the end of each line of data.

Answer 2

The trick is using Arrays.copyOfRange() to extract the rest part of the line. More details here .

public static void main(String[] args) {
    String line = "pizza  very cheesy   12.30        3";
    String[] parts = line.split("\\s+");

    String name = parts[0];
    int count = Integer.parseInt(parts[parts.length - 1]);
    double price = Double.parseDouble(parts[parts.length - 2]);

    String description = String.join(
            " ", Arrays.copyOfRange(parts, 1, parts.length - 2));

    System.out.println("name: " + name +
            "\ndescription: " + description +
            "\nprice: " + price +
            "\ncount: " + count
    );
}