题解 | #坐标移动#

import java.util.Scanner;

// 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
        while (in.hasNextLine()) { // 注意 while 处理多个 case
            String actions = in.nextLine();
            String[] split = actions.split(";");
            int x = 0;
            int y = 0;
            for (String a : split) {
                Action action = getAction(a);
                if (action != null) {
                    switch (action.action) {
                        case "A":
                            x -= action.step;
                            break;
                        case "D":
                            x += action.step;
                            break;
                        case "W":
                            y += action.step;
                            break;
                        case "S":
                            y -= action.step;
                            break;
                    }
                }
            }
            System.out.println(x + "," + y);
        }
    }

    public static class Action {
        String action;
        int step;
    }

    public static Action getAction(String a) {
        if (a != null) {
            boolean b = a.startsWith("A") || a.startsWith("D") || a.startsWith("W") ||
                        a.startsWith("S");

            if (b) {
                try {
                    int i = Integer.parseInt(a.substring(1, a.length()));
                    Action action = new Action();
                    action.step = i;
                    action.action = a.substring(0, 1);
                    return action;
                } catch (Exception e) {
                    return null;
                }
            }
        }
        return null;

    }
}