使用接口组织枚举

来源：互联网发布：网站用linux还是win 编辑：程序博客网时间：2024/06/06 01:51

自己下载调试了一下，页面关了。

雷同太多找不到是谁了，无法表明出处，注明来自互联网。

枚举还有很多其他用法，这种没用过mark一下，工作中遇到再来补充性能测试。

package enumerated.menu;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("---");}}}

package enumerated.menu;import java.util.*;public class Enums {private static Random rand = new Random(47);public static <T extends Enum<T>> T random(Class<T> ec) {return random(ec.getEnumConstants());}public static <T> T random(T[] values) {return values[rand.nextInt(values.length)];}}

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