题解 | 坐标移动

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        int x = 0, y = 0;
        String []list = in.nextLine().split(";");
        for (int i = 0; i < list.length; i++) {
            String command = list[i];
            if (!checkValid(command)) {
                continue;
            }
            Character direction = command.charAt(0);
            String intStr = command.substring(1);
            int distance = Integer.parseInt(intStr);
            switch (direction) {
                case 'W':
                    y += distance;
                    break;
                case 'A':
                    x -= distance;
                    break;
                case 'S':
                    y -= distance;
                    break;
                case 'D':
                    x += distance;
                    break;
                default:
                    break;
            }
        }

        System.out.print(x + "," + y);


    }

    public static boolean checkValid(String command) {
        String regex = "^[ASWD]([1-9]|[1-9][0-9])$";

        Pattern p = Pattern.compile(regex);
        Matcher m = p.matcher(command);
        if (m.matches()) {
            return true;
        } else {
            return false;
        }

    }
}