Groovy bean one with handcrafted comparison

BeanOne.groovy

package delegation

import groovy.transform.TupleConstructor

@TupleConstructor
class BeanOne implements Comparable<BeanOne> {
    String firstName
    String familyName

    public String getFullName() {
        return "$firstName $familyName"
    }

    @Override
    int compareTo(BeanOne o) {
        if (!o) return false
        if (this.is(o)) return false
        return fullName <=> o.fullName
    }
}