java 枚举类型拾遗

仅供自己参考。来自thinking in java 书籍案例，结合自己的尝试。主要记录自己的问题。
package com.zhi.learnj;

import com.zhi.learnj2.Gender;

public class EnumClass {

public static void main(String[] args){

// Shrubbery that = Shrubbery.CRAWLING;

// for(Shrubbery s: Shrubbery.values()){
// System.out.println(s.ordinal());
// System.out.println(s.name());
// if(that.equals(s)){
// System.out.println(s.toString());
// }
// }
Gender gender = Gender.M;
System.out.println(gender);

// System.out.println(Enum.valueOf(Shrubbery.class, "JACKIEZHI"));
// System.out.println(Shrubbery.CRAWLING.getClass());
// System.out.println(Shrubbery.CRAWLING.getDeclaringClass());
}

}
/**
* 操作系统的类型
* @author jackiezhi<[email protected]>
* @date 2015年12月31日
*/
enum SystemType implements IService, Runnable{
MAC("issued by apple"),
WINDOWS("issued by microsoft"),
LINUX("issued by god"),
UNIX("issued by god");

private String desc;
SystemType(String desc){
this.desc = desc;
}

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

@Override
public String toString() {
return "name="+super.toString()+", desc="+desc;
}

@Override
public void service(String username) {

}

@Override
public void run() {
}
}

interface IService{
void service(String username);
}

/**
* 枚举类型除了不能被继承之外，可以看成一个常规的类，可以实现接口
* @author jackiezhi<[email protected]>
* @date 2015年12月31日
*/
enum Shrubbery implements Runnable{GROUND, CRAWLING, HANGING;

@Override
public void run() {

}}

class Shrubbery2 {
public static Shrubbery2
        A =new Shrubbery2("A", 0),
B = new Shrubbery2("B", 1);

/**
* name & ordinal 是所有的Enum 类型共有的，因此放到了Enum 这个抽象类中。
* Enum 同时提供一些共有的方法
*/
private String name;
private int ordinal;

private Shrubbery2(String name, int ordinal){
this.name = name;
this.ordinal = ordinal;
}

//compareTo()
//equals()
//name() & ordinal()
}
//不能继承自枚举类型。