java - Avoiding code duplication when overriding abstract methods in enum -

i implementing state machine in enum in java. have toy example below, transition between x,y , z states based on group membership.

the issue is, transition rule y , z identical (i.e., overriden methods identical).

is there way avoid code duplication here? in real life example, bit more severe code duplication potential worse.

enum group {     a,b,c }  enum element {     x(group.a) {         @override         public element getnextelement(element nextelement) {             if(nextelement.getgroup() == group.b) {                 return nextelement;             } else {                 return this;             }         }     },     y(group.b) {         @override         public element getnextelement(element nextelement) {             if(nextelement.getgroup() == group.a) {                 return nextelement;             } else {                 return this;             }         }     },     z(group.c) {         @override         public element getnextelement(element nextelement) {             if(nextelement.getgroup() == group.a) {                 return nextelement;             } else {                 return this;             }         }     };      group group;      element(group group) {         this.group=group;      };      public group getgroup() {         return this.group;     }      public abstract element getnextelement(element nextelement);  } 

you use strategy pattern, in following example. example improved thinking how different strategies relate each other , pulling similarities 1 or several strategy base classes:

enum element {      interface transitionstrategy {        element getnextelement (element myself, element nextelement);     }      static class nextonbstrategy implements transitionstrategy {        element getnextelement (element myself, element nextelement) {             if(nextelement.getgroup() == group.b) {                 return nextelement;             } else {                 return myself;             }         }                     }      // other strategies      x(group.a, new nextonbstrategy ()),     y(group.b, new nextonastrategy ()),     z(group.c, new nextonastrategy ());      group group;     transitionstrategy strategy;      element(group group, transitionstrategy strategy) {         this.group=group;          this.strategy=strategy;     };      // ...       public element getnextelement(element nextelement) {        return this.strategy.getnextelement (this, nextelement);     }  }