题解 | HJ17#坐标移动#

import java.util.*;

// 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) {
//        AA10; A1A; $%$; YAD;A10;
//        合法坐标为A(或者D或者W或者S) + 数字（两位以内）
//        坐标之间以;分隔。
//        非法坐标点需要进行丢弃。如AA10; A1A; $%$; YAD; 等
        Scanner scanner = new Scanner(System.in);
        String str = scanner.nextLine();
        String[] split = str.split("\\;");
//        System.out.println(Arrays.toString(split) );
        //只存合法方向的坐标
        ArrayList<String> list = new ArrayList<>();
        String[] split1 = new String[split.length];
        for (int i = 0; i < split.length; i++) {
            split1[i] = split[i].trim();
        }
//        System.out.println(Arrays.toString(split1));

        for (int i = 0; i < split1.length; i++) {
            //坐标长度一定<=3
            if (split1[i].length() > 0 && split1[i].length() <= 3) {
                //首字母为大写字母
                //考虑空字符情况
                if (split1[i] != null) {
                    if (split1[i].charAt(0) == 'W' || split1[i].charAt(0) == 'A' ||
                            split1[i].charAt(0) == 'S' || split1[i].charAt(0) == 'D') {
                        //第二个char必须为数字
                        if (47 < split1[i].charAt(1) && split1[i].charAt(1) <= 57) {
                            if (split1[i].length() == 2) {
                                list.add(split1[i]);
                            }
//                        若坐标长度为3 第3个char必须为数字
                            else if (split1[i].length() == 3 && 47 < split1[i].charAt(2) &&
                                     split1[i].charAt(2) <= 57) {
                                list.add(split1[i]);
                            }
                        }
                    }
                }
            }
        }
//        System.out.println(list);
        //合法坐标已存储
        int X = 0;
        int Y = 0;//初始坐标(0,0)==(X,Y)

        for (int i = 0; i < list.size(); i++) {
            if (list.get(i).charAt(0) == 'A') {
                String substring = list.get(i).substring(1);
                int parseInt = Integer.parseInt(substring);
                X = X - parseInt;
            } else if (list.get(i).charAt(0) == 'D') {
                String substring = list.get(i).substring(1);
                int parseInt = Integer.parseInt(substring);
                X = X + parseInt;
            } else if (list.get(i).charAt(0) == 'W') {
                String substring = list.get(i).substring(1);
                int parseInt = Integer.parseInt(substring);
                Y = Y + parseInt;
            } else if (list.get(i).charAt(0) == 'S') {
                String substring = list.get(i).substring(1);
                int parseInt = Integer.parseInt(substring);
                Y = Y - parseInt;
            }
        }
        System.out.println(X + "," + Y);

    }

}