The java enum and annotations

The new JDK1.5 enum keyword is used to define enumeration class.

Enumeration class and normal class differences :

• Use enum defined enumeration class inherits the default java.lang.Enum class;
• Enumeration class constructor can use the private modifier;
• All enumeration class instances must appear listed in the enumeration class (separated; the end). Examples listed in the system will automatically add public static final modification;
• All enumeration class values ​​provides a method which can easily traverse all the enumerated value;

JDK1.5 enumeration class objects can be used as a switch in expression expression, case clause may be used as the name enumeration value, defined as the need to add enumeration class.

If the enumeration is only one member, it can be implemented as a single way of embodiment modes.

Package Anno; 

public  class the Test {
     public  static  void main (String [] args) {
         // here for a target Season 
        Season = Spring Season.SPRING; 
        spring.showInfo (); 
        Season Summer = Season.SUMMER; 
        summer.showInfo () ; 
        Season Autumn = Season.AUTUMN; 
        autumn.showInfo (); 
        Season Winter = Season.WINTER; 
        winter.showInfo (); 
        
        spring.test (); 
        
        // every time a same object execution Season.SPRING obtained, is a single-mode embodiment 
        Season spring1 =Season.SPRING; 
        System.out.println (Spring == spring1); 
    } 
} 
enum Season the implements the Tmp {
     // this call has parameters corresponding to the private constructor 
    SPRING ( "spring", "spring" ), 
    SUMMER ( "summer", "summer" ), 
    aUTUMN ( "autumn", "autumn" ), 
    wINTER ( "winter", "wind Ling Lie" );
     Private  Final String NAME;
     Private  Final String DESC;
     Private Season (String NAME, String DESC) {
         the this .NAME = NAME;
        this.DESC = DESC;
    }
    public void showInfo() {
        System.out.println(this.NAME+":"+this.DESC);
    }
    @Override
    public void test() {
        // TODO Auto-generated method stub
        System.out.println("这是实现Tmp的方法");
    }
}
interface Tmp{
    void test();
}