枚举类型

package EnumTest;

public enum  FoodSelect {
    DESERT(1,"甜点"), DRINK(2,"饮料"), NOODLES(3,"面条");
    private int code;
    private String name;
    private FoodSelect(int code,String name){
        this.code = code;
        this.name = name;
    }
    public int getCode(){
        return code;
    }
    public String getName(){
        return name;
    }
    public void setCode(int code){
        this.code = code;
    }
    public void setName(String name){
        this.name = name;
    }
    public String toString(){
        return this.getName() + "--" + this.getCode();
    }
}

package EnumTest;

public class Test {
    public static void main(String[] args) {
        System.out.println(FoodSelect.DESERT.getCode());
        System.out.println(FoodSelect.DRINK.getName());
    }
}

1
饮料

package enumTest;

public interface DayInterface {

    public String getDay();
}

package enumTest;

public enum MyDay implements DayInterface{
    
    MONDAY(1,"星期一"),THUSDAY(2,"星期二");//这个后面必须有分号
    
    private int code;
    private String name;
    private MyDay(int code,String name) {
        this.code = code;
        this.name = name();
    }
    
    public int getCode() {
        return code;
    }
    public String getName() {
        return name;
    }
    public void setCode(int code) {
        this.code = code;
    }
    public void setName(String name) {
        this.name = name;
    }
    @Override
    public String toString() {
        // TODO Auto-generated method stub
        return this.getName()+"---"+this.getCode();
    }

    @Override
    public String getDay() {
        return this.getName();
    }
}

package enumTest;

public class Test {
    public static void main(String[] args) {
        System.out.println(MyDay.THUSDAY.getDay());
    }
}

THUSDAY

package enumTest;

public interface Food {  
    enum Coffee implements Food{  
        BLACK_COFFEE,DECAF_COFFEE,LATTE,CAPPUCCINO  
    }  
    enum Dessert implements Food{  
        FRUIT, CAKE, GELATO  
    }  
}

package enumTest;

import enumTest.Food.Coffee;
import enumTest.Food.Dessert;

public class Test {
        
    public  static void main(String[] args) {  
        for (Dessert dessertEnum : Food.Dessert.values()) {  
            System.out.print(dessertEnum + "  ");  
        }  
        System.out.println();  
        //我这地方这么写，是因为我在自己测试的时候，把这个coffee单独到一个文件去实现那个food接口，而不是在那个接口的内部。  
        for (Coffee coffee : Food.Coffee.values()) {  
            System.out.print(coffee + "  ");  
        }  
        System.out.println();  
        //搞个实现接口，来组织枚举，简单讲，就是分类吧。如果大量使用枚举的话，这么干，在写代码的时候，就很方便调用啦。  
        //还有就是个“多态”的功能吧，  
        Food food = Food.Dessert.CAKE;  
        System.out.println(food);  
        food = Coffee.BLACK_COFFEE;  
        System.out.println(food);  
    } 
}

FRUIT CAKE GELATO 
BLACK_COFFEE DECAF_COFFEE LATTE CAPPUCCINO 
CAKE
BLACK_COFFEE