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abstract method in enum

gudii9
gudii9 asked
on
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Last Modified: 2014-08-10
Hi,

I was reading below link


http://javarevisited.blogspot.com/2011/08/enum-in-java-example-tutorial.html#ixzz39ALX5kTO


and the example
public enum Currency implements Runnable{
          PENNY(1) {
                  @Override
                  public String color() {
                          return "copper";
                  }
          }, NICKLE(5) {
                  @Override
                  public String color() {
                          return "bronze";
                  }
          }, DIME(10) {
                  @Override
                  public String color() {
                          return "silver";
                  }
          }, QUARTER(25) {
                  @Override
                  public String color() {
                          return "silver";
                  }
          };
          private int value;

          public abstract String color();
        
          private Currency(int value) {
                  this.value = value;
          }
          ..............

}

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I wonder why we need abstract kind of methods inside enums. what are the practical use of it. what design pattern is being used.Please advise
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