使用enum关键字定义枚举类

1. 枚举类的说明：
* 1.枚举类的理解：类的对象只有有限个，确定的。我们称此类为枚举类
* 2.当需要定义一组常量时，强烈建议使用枚举类
* 3.如果枚举类中只一个对象，则可以作为单例模式的实现方式。

/**
 * @Author lx
 * @Description  使用enum关键字定义枚举类
 * @Date 9:16 2020/8/11
 * @Version
 */
public class EnumTest {
    public static void main(String[] args) {
        Season1 autumn = Season1.AUTUMN;
        System.out.println(autumn);
        System.out.println("******");
        //values():返回所的枚举类对象构成的数组
        Season1[] values = Season1.values();
        for (int i = 0;i<values.length;i++){
            System.out.println(values[i]);
            values[i].show();
        }
        System.out.println("*******");

        //valuesOf(String objName):返回枚举类中对象名是objName的对象。
        Season1 winter = Season1.valueOf("WINTER");
        System.out.println(winter);
        winter.show();
        //如果没objName的枚举类对象，则抛异常：IllegalArgumentException
//        Season1 winter = Season1.valueOf("WINTER1");
    }


}
//定义接口
interface info{
    void show();
}

//使用enum定义枚举类
enum Season1 implements info{
    //1、先提供对象，多个对象' , '隔开，末尾使用 ' ; '
    SPRING("春天","春暖花开"){
        @Override
        public void show() {
            System.out.println("春天到啦");
        }
    },
    SUMMER("夏天","夏日炎炎"){
        @Override
        public void show() {
            System.out.println("夏天到啦");
        }
    },
    AUTUMN("秋天","秋高气爽"){
        @Override
        public void show() {
            System.out.println("秋天到啦");
        }
    },
    WINTER("冬天","白雪皑皑"){
        @Override
        public void show() {
            System.out.println("冬天到啦");
        }
    };

  //  2、声明season对象的属性：private final
    private final String SEASONNAME ;
    private final String SEASONDESC;

    //3、提供构造方法，给对象赋值
    private Season1(String SEASONNAME,String SEASONDESC){
       this.SEASONNAME = SEASONNAME;
        this.SEASONDESC = SEASONDESC;
    }
    //4、获取枚举类对象的属性
    public String getSEASONNAME() {
        return SEASONNAME;
    }

    public String getSEASONDESC() {
        return SEASONDESC;
    }

//    @Override
//    public void show() {
//        System.out.println("这是一个季节");
//    }

    //根据需要决定是否重写toString方法


//    @Override
//    public String toString() {
//        return "Season1{" +
//                "SEASONNAME='" + SEASONNAME + '\'' +
//                ", SEASONDESC='" + SEASONDESC + '\'' +
//                '}';
//    }
}



//*************************************************//
////1、自定义枚举类
//class Season1{
//    //2、声明season对象的属性：private final
//    private final String SEASONNAME ;
//    private final String SEASONDESC;
//    //3、声明类的私有化构造器，并给对象赋值
//    private Season1(String SEASONNAME,String SEASONDESC){
//        this.SEASONNAME = SEASONNAME;
//        this.SEASONDESC = SEASONDESC;
//    }
//    //3、提供当前枚举类的多个对象：public static final修饰
//    public static final Season1 SPRING = new Season1("春天","春暖花开");
//    public static final Season1 SUMMER = new Season1("夏天","夏日炎炎");
//    public static final Season1 AUTUMN = new Season1("秋天","秋高气爽");
//    public static final Season1 WINTER = new Season1("冬天","白雪皑皑");
//
//    //获取枚举类对象的属性
//    public String getSEASONNAME() {
//        return SEASONNAME;
//    }
//
//    public String getSEASONDESC() {
//        return SEASONDESC;
//    }
//    //提供toString方法
//    @Override
//    public String toString() {
//        return "Season1{" +
//                "SEASONNAME='" + SEASONNAME + '\'' +
//                ", SEASONDESC='" + SEASONDESC + '\'' +
//                '}';
//    }
//}