java 枚举类型怎么输出

public enum Weather{ Sunny,Rainy,Cloudy}
public String toString(){
return ; //这里怎么写才能输出是 Sunny或Rainy或Cloudy呢？
}

http://ideone.com/6ghz84
Sunny

 /* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
    public enum Weather{ Sunny,Rainy,Cloudy}

    public static void main (String[] args) throws java.lang.Exception
    {
        // your code goes here
        String s = Weather.Sunny.toString();
        System.out.println(s);
    }
}

sorry，看错了。
根本什么都不要写就是了。

Weather w = Weather.Sunny;
String s = w.Sunny.toString();
System.out.println(s);
这样是不是清楚一些

return this.toString();