题解 | #坐标移动#

import java.util.*;
import java.util.regex.*;
import java.util.stream.*;

// 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
            System.out.println(positionXY(in.nextLine()));
        }
    }

    /**
     * HJ17 坐标移动
     *
     * @param str 多个有效无效坐标拼接的字符串
     * @return 最终坐标
     */
    private static String positionXY(String str) {
        int x = 0;
        int y = 0;
        List<String> lst = Arrays.stream(str.split(";"))
                .filter(s -> Pattern.matches("^(A|S|W|D)[0-9]{1,2}$", s))
                .collect(Collectors.toList());
        for (String s : lst) {
            char c = s.charAt(0);
            switch (c){
                case 'A':
                    x = x - getNum(s, c);
                    break;
                case 'D':
                    x = x + getNum(s, c);
                    break;
                case 'W':
                    y = y + getNum(s, c);
                    break;
                case 'S':
                    y = y - getNum(s, c);
                    break;
                default:
                    break;
            }
        }
        return x + "," + y;
    }

    private static int getNum(String s, char c) {
        return Integer.parseInt(s.replace(c, ' ').trim());
    }
}