题解 | #坐标移动#

import java.util.Arrays; import java.util.Objects; import java.util.Scanner; import java.util.function.BiConsumer; import java.util.regex.Matcher; import java.util.regex.Pattern;

public class Main {

private Integer xPosition;
private Integer yPosition;

Main() {
    xPosition = 0;
    yPosition = 0;
}

private void up(Integer distance) {
    this.yPosition += distance;
}

private void down(Integer distance) {
    this.yPosition -= distance;
}

private void left(Integer distance) {
    this.xPosition -= distance;
}

private void right(Integer distance) {
    this.xPosition += distance;
}

private void printPosition() {
    System.out.println(String.format("%s,%s", xPosition, yPosition));
}

private static class Movement {
    private Direction direction;
    private Integer distance;

    private void move(Main m) {
        direction.action.accept(m, distance);
    }

    public static Movement createByCmd(String cmd) {
        String rex = "^([WSAD])(\\d+)$";
        Pattern pattern = Pattern.compile(rex);
        Matcher matcher = pattern.matcher(cmd);
        if (matcher.find()) {
            String directionStr = matcher.group(1);
            int distance = Integer.parseInt(matcher.group(2));
            Movement movement = new Movement();
            movement.direction = Direction.valueOf(directionStr);
            movement.distance = distance;
            return movement;
        }
        return null;
    }
}

enum Direction {
    W("up", Main::up),
    S("down", Main::down),
    A("left", Main::left),
    D("right", Main::right);
    private final String note;
    private final BiConsumer<Main, Integer> action;

    Direction(String note, BiConsumer<Main, Integer> action) {
        this.note = note;
        this.action = action;
    }
}

public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    while (scanner.hasNextLine()) {
        String line = scanner.nextLine();
        Main mover = new Main();
        Arrays.stream(line.split(";")).map(Movement::createByCmd).filter(Objects::nonNull).forEach(x -> x.move(mover));
        mover.printPosition();
    }
}

}