java - How to use enum for singleton design pattern? -

i understand following piece of code gives same instance , can not modified , best recommended single/multi-threaded use.

enum colors {     red, blue, green; } 

but want know how use enum applying singleton pattern custom classes, mean initializations , return instance. citing example of great help.

you can encapsulation , initialization in class.

here's simple example:

public enum color{   instance(10, 30, 50);    private int red, green, blue;      private color(int red, int green, int blue){      this.red = red;      this.green = green;      this.blue = blue;   }    public int getred(){      return red;   }    public int getgreen(){      return green;   }    public int getblue(){      return blue;   } } 

in case have thread safe singleton instance of enum type color.