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 + '\'' + // '}'; // } //}