/**
 * 模擬枚舉
 * 
 * @author Administrator
 *
 */
public abstract class T3_WeekDay {
    /**
     * 私有化構造器，防止用戶創建對象
     */
    private T3_WeekDay() {
    }

    // 創建兩個“枚舉”對象
    public static final T3_WeekDay SUN = new T3_WeekDay() {
        /**
         * 用匿名內部類去重寫nextDay方法，將if，else，轉移成了一個個獨立的類
         
 
*/
        @Override
        public T3_WeekDay nextDay() {
            return MON;
        }

        public String toString() {
            return "MON";
        };

    };

    public static final T3_WeekDay MON = new T3_WeekDay() {

        @Override
        public T3_WeekDay nextDay() {
            
 
return SUN;
        }

        public String toString() {
            return "SUN";
        };

    };

    public abstract T3_WeekDay nextDay();
}

JDK5新特性_2.模擬枚舉類型