title: enum to store RGB strings
body: <p>I've never used enums before so I'm finding them very confusing!  I'd like to store a lot of RGB values (as strings) and I assume an enum is the best option rather than a class listing a load of static final strings?  I'm experimenting with the code and here's what I've got so far, is this correct?  (Seems to work OK)</p>
  
  <pre><code>public enum Colors {
      GREY("142, 142, 147"),
      RED("255, 59, 48"),
      GREEN("76, 217, 100"),
      PURPLE("88, 86, 214"),
      LIGHTBLUE ("52, 170, 220");    //... etc, this is a shorted list
  
      private Colors(final String string) {
          this.string = string;
      }
  
      private final String string;
  
      public String getRGB() {
          return string;
      }
  }
  
  public class HelloWorld{
      public static void main(String[] args) {
  
          String test = Colors.LIGHTBLUE.getRGB();
          System.out.println(test);
  
      }
  }
  </code></pre>