class Point {
    public double x;
    public double y;
}

class Point {
  private double x;
  private double y;
  public Point(double x, double y) {
    this.x = x;
    this.y = y;
  }
  public double getX() { return x; }
  public double getY() { return y; }
  public void setX(double x) { this.x = x; }
  public void setY(double y) { this.y = y; }
}

public final class Time {
  private static final int HOURS_PER_DAY = 24;
  private static final int MINUTES_PER_HOUR = 60;
  public final int hour;
  public final int minute;
  public Time(int hour, int minute)
  {
    if (hour < 0 || hour >= HOURS_PER_DAY)
      throw new IllegalArgumentException ("시간: " + hour);
    if (minute < 0 || minute >= MINUTES_PER_HOUR)
      throw new IllegalArgumentException ("분: " + minute);
    this.hour = hour;
    this.minute = minute;
  }
  ... // 나머지 코드 생략
}