OnJava8-Examples/enums/menu

//: enums/menu/Course.java
// <20>2015 MindView LLC: see Copyright.txt
package enums.menu;
import net.mindview.util.*;

public enum Course {
  APPETIZER(Food.Appetizer.class),
  MAINCOURSE(Food.MainCourse.class),
  DESSERT(Food.Dessert.class),
  COFFEE(Food.Coffee.class);
  private Food[] values;
  private Course(Class<? extends Food> kind) {
    values = kind.getEnumConstants();
  }
  public Food randomSelection() {
    return Enums.random(values);
  }
} ///:~
//: enums/menu/Food.java
// <20>2015 MindView LLC: see Copyright.txt
// Subcategorization of enums within interfaces.
package enums.menu;

public interface Food {
  enum Appetizer implements Food {
    SALAD, SOUP, SPRING_ROLLS;
  }
  enum MainCourse implements Food {
    LASAGNE, BURRITO, PAD_THAI,
    LENTILS, HUMMOUS, VINDALOO;
  }
  enum Dessert implements Food {
    TIRAMISU, GELATO, BLACK_FOREST_CAKE,
    FRUIT, CREME_CARAMEL;
  }
  enum Coffee implements Food {
    BLACK_COFFEE, DECAF_COFFEE, ESPRESSO,
    LATTE, CAPPUCCINO, TEA, HERB_TEA;
  }
} ///:~
//: enums/menu/Meal.java
// <20>2015 MindView LLC: see Copyright.txt
package enums.menu;

public class Meal {
  public static void main(String[] args) {
    for(int i = 0; i < 5; i++) {
      for(Course course : Course.values()) {
        Food food = course.randomSelection();
        System.out.println(food);
      }
      System.out.println("---");
    }
  }
} /* Output:
SPRING_ROLLS
VINDALOO
FRUIT
DECAF_COFFEE
---
SOUP
VINDALOO
FRUIT
TEA
---
SALAD
BURRITO
FRUIT
TEA
---
SALAD
BURRITO
CREME_CARAMEL
LATTE
---
SOUP
BURRITO
TIRAMISU
ESPRESSO
---
*///:~
//: enums/menu/Meal2.java
// <20>2015 MindView LLC: see Copyright.txt
package enums.menu;
import net.mindview.util.*;

public enum Meal2 {
  APPETIZER(Food.Appetizer.class),
  MAINCOURSE(Food.MainCourse.class),
  DESSERT(Food.Dessert.class),
  COFFEE(Food.Coffee.class);
  private Food[] values;
  private Meal2(Class<? extends Food> kind) {
    values = kind.getEnumConstants();
  }
  public interface Food {
    enum Appetizer implements Food {
      SALAD, SOUP, SPRING_ROLLS;
    }
    enum MainCourse implements Food {
      LASAGNE, BURRITO, PAD_THAI,
      LENTILS, HUMMOUS, VINDALOO;
    }
    enum Dessert implements Food {
      TIRAMISU, GELATO, BLACK_FOREST_CAKE,
      FRUIT, CREME_CARAMEL;
    }
    enum Coffee implements Food {
      BLACK_COFFEE, DECAF_COFFEE, ESPRESSO,
      LATTE, CAPPUCCINO, TEA, HERB_TEA;
    }
  }
  public Food randomSelection() {
    return Enums.random(values);
  }
  public static void main(String[] args) {
    for(int i = 0; i < 5; i++) {
      for(Meal2 meal : Meal2.values()) {
        Food food = meal.randomSelection();
        System.out.println(food);
      }
      System.out.println("---");
    }
  }
} /* Same output as Meal.java *///:~
//: enums/menu/TypeOfFood.java
// <20>2015 MindView LLC: see Copyright.txt
package enums.menu;
import static enums.menu.Food.*;

public class TypeOfFood {
  public static void main(String[] args) {
    Food food = Appetizer.SALAD;
    food = MainCourse.LASAGNE;
    food = Dessert.GELATO;
    food = Coffee.CAPPUCCINO;
  }
} ///:~