Java之enumeration(枚举) java enum(枚举)使用详解 + 总结

package com.enums;

public class TestEnum {

    public static void main(String[] args) {
        Season season = Season.autumn;
        System.out.println(season);//autumn
        
        System.out.println(season.compareTo(Season.autumn));//0
        System.out.println(season.compareTo(Season.spring));//2
        
        System.out.println(season.getDeclaringClass());//class com.enums.TestEnum$Season
        
        System.out.println(Season.autumn.name());//autumn
        
        System.out.println(Season.autumn.ordinal());//2
        
        System.out.println(Season.autumn.toString());//autumn
        
        System.out.println(Season.valueOf(Season.class, "autumn"));//autumn
        
        
    }

    /**
     * int compareTo(E o) 比较此枚举与指定对象的顺序，返回值为枚举与指定对象的序号差。
     * Class<E> getDeclaringClass()  返回与此枚举常量的枚举类型相对应的 Class 对象。
     * String name() 返回此枚举常量的名称，在其枚举声明中对其进行声明。
     * int ordinal()  返回枚举常量的序数（它在枚举声明中的位置，其中初始常量序数为零）。
     * String toString() 返回枚举常量的名称，它包含在声明中。
     * static <T extends Enum<T>> T valueOf(Class<T> enumType, String name) 返回带指定名称的指定枚举类型的枚举常量。
     * 
     * @author Administrator
     *
     */
    public enum Season {
         spring, summer, autumn, winter;
    }
    

}

package com.enums;

public class TestEnum1 {

    public static void main(String[] args) {
        for(Season s : Season.values()){
            System.out.println(s);
        }
    }

    public enum Season {
         spring, summer, autumn, winter;
    }
    

}

package com.enums;

public class TestEnum2 {

    public static void main(String[] args) {
        
        Season season = Season.autumn;
        
        switch (season) {
            case spring:
                System.out.println("春天");
                break;
            case summer:
                System.out.println("夏天");
                break;
            case autumn:
                System.out.println("秋天");
                break;
            case winter:
                System.out.println("冬天");
                break;
            
        }
    }

    public enum Season {
         spring, summer, autumn, winter;
    }
    
}

package com.enums;

public class TestEnum3 {

    public static void main(String[] args) {
        System.out.println(Season.autumn.getName());//秋天
    }

    public enum Season {
         spring("春天"), summer("夏天"), autumn("秋天"), winter("冬天");
         
         private String name;
         
         private Season(String name){
             this.name = name;
         }

        public String getName() {
            return name;
        }
         
    }
    
}