التعدادات (Enums)

public enum Day {
  SUNDAY, MONDAY, TUESDAY, WEDNESDAY,
  THURSDAY, FRIDAY, SATURDAY
}

Day today = Day.MONDAY;

if (today == Day.SUNDAY || today == Day.SATURDAY) {
  System.out.println("عطلة!");
} else {
  System.out.println("أيام العمل");
}

switch (today) {
  case MONDAY    -> System.out.println("بداية الأسبوع");
  case FRIDAY    -> System.out.println("الحمد لله يوم الجمعة");
  case SUNDAY    -> System.out.println("الراحة");
  default        -> System.out.println("أيام العمل");
}

Day d = Day.FRIDAY;
d.name();      // "FRIDAY"
d.ordinal();   // 4 (يبدأ من 0)

public enum Season {
  SPRING("ربيع"),
  SUMMER("صيف"),
  AUTUMN("خريف"),
  WINTER("شtail");

  private final String arabicName;

  Season(String arabicName) {
    this.arabicName = arabicName;
  }

  public String getArabicName() {
    return arabicName;
  }
}

Season s = Season.SUMMER;
System.out.println(s.getArabicName()); // صيف

Season summer = Season.valueOf("SUMMER");  // الصيغة: الاسم كبير بالإنجليزية

for (Season s : Season.values()) {
  System.out.println(s.ordinal() + " - " + s.getArabicName());
}