Java 基础(枚举类)

1.枚举类的理解:类的对象只有有限个，确定的
2.当需要定义一组常量时，强烈建议使用枚举类
3.如果枚举类中只有一个对象，则可以作为单例模式的实现方式

package com.klvchen.java;

public class SeasonTest1 {
    public static void main(String[] args){
        Season1 summer = Season1.SUMMER;
        System.out.println(summer);

        System.out.println(summer.toString());

        System.out.println(Season1.class.getSuperclass());

        System.out.println("********************");

        Season1[] values = Season1.values();
        for (int i = 0; i < values.length; i++){
            System.out.println(values[i]);
            values[i].show();
        }
        System.out.println("********************");
        Thread.State[] values1 = Thread.State.values();
        for (int i = 0; i < values1.length; i++){
            System.out.println(values1[i]);
        }

        System.out.println("********************");
        Season1 winter = Season1.valueOf("WINTER");
        System.out.println(winter);
        winter.show();

    }
}

interface Info{
    void show();
}

//使用 enum 关键字枚举类
enum Season1 implements Info{
    //1.提供当前枚举类的对象，多个对象之间用","隔开，末尾对象";"结束
    SPRING("春天","春暖花开"){
        @Override
        public void show(){
            System.out.println("春天在哪里?");
        }
    },
    SUMMER("夏天","夏日炎炎"){
        @Override
        public void show(){
            System.out.println("宁夏");
        }
    },
    AUTUMN("秋天","秋高气爽"){
        @Override
        public void show(){
            System.out.println("秋天不回来");
        }
    },
    WINTER("冬天","冰天雪地"){
        @Override
        public void show(){
            System.out.println("大约在冬季");
        }
    };

    //2.声明 Season 对象的属性: private final 修饰
    private final String seasonName;
    private final String seasonDesc;

    //3.私有化类的构造器,并给对象属性赋值
    private Season1(String seasonName,String seasonDesc){
        this.seasonName = seasonName;
        this.seasonDesc = seasonDesc;
    }

    public String getSeasonName(){
        return seasonName;
    }

    public String getSeasonDesc(){
        return seasonDesc;
    }

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