java - 输入: 123 -123 Output: 0 Exception in thread "main" java. lang.ArrayIndexOutOfBoundsException:

Question

  public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String num = sc.next();
        String[] partsOfNums = num.split("\\-");
        int num1 = Integer.parseInt(partsOfNums[0]);
        int num2 = Integer.parseInt(partsOfNums[1]);
        int result = num1 - num2;
        System.out.println(result);

    }

}

我想输入 123 -123 并打印出 0，但出现错误。

 Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 1
    at codingexercises.Main.main(Main.java:12)

代码有什么问题吗？

Answer 1

• 读取整行而不是下一个字符串标记
• 分割时不需要添加转义符

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String num = sc.nextLine();
        String[] partsOfNums = num.split("-");
        int num1 = Integer.parseInt(partsOfNums[0].trim());
        int num2 = Integer.parseInt(partsOfNums[1].trim());
        int result = num1 - num2;
        System.out.println(result);

    }
}