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Arrays.sort(persons, new Comparator<Person>() {
@Override
public int compare(Person o1, Person o2) {
return o1.getAge() - o2.getAge();
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This is incorrect in general. Use Integer.compare.

};

// TODO use Arrays.sort
Arrays.sort(persons, Comparator.comparing(p -> p.getAge()));
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Use comparingInt o avoid boxing.

final Predicate<Person> validateLastName = hasEmptyLastName.negate(); // TODO use Predicate::negate

final Predicate<Person> validate = null; // TODO use Predicate::and
final Predicate<Person> validate = and(validateFirstName, validateLastName); // TODO use Predicate::and
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use Predicate::and

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2 participants