public boolean isEvaluated() {
		return _fitness != null;
	}
A phenotype instance can be created with or without fitness value.
Initially, the phenotype is created without fitness value. The
fitness evaluation strategy is responsible for creating phenotypes with
fitness value assigned.

@since 4.2

@see #nonEvaluated()

@return {@code true} is this phenotype has a fitness value assigned,
        {@code false} otherwise
jenetics/src/main/java/io/jenetics/Phenotype.java