java - How does TimeUnit.class enum operation work? -

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how enum in timeunit api work? particularly below syntax mean?

public enum name {     constant { } }

i have been following enum tutorial here, doesn't go details of above syntax. thing inside constant? anonymous class own methods? methods outside of constants? i'm confused.

in {} "abstract" methods implemented. see body of class extends - follow example - "name". if have method in name - let's 

public string somemethod(){ throw new abstractmethoderror(); /*or default implementation.*/ }

then you'd have implement in 

constant{     public string somemethod() {  return "green eggs , ham"; } }

and that's done in timeunit - defines abstract methods converting different units , elements implement conversion methods magnitude.


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