java - Why this enum doesn't compile? -

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why enum doesn't compile?

public enum ackr implements cloneable{     instance;      public <ackr extends cloneable> ackr getinstance(){         return instance; //type mismatch: cannot convert ackr ackr //      return (ackr)instance; //type safety: unchecked cast ackr ackr     } }

that type argument is, far know, not neccessary. try simply

public ackr getinstance(){     return instance; }

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