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// Person.java
public class Person implements Comparable { 
private final String firstname; 
private final String lastname; 
public Person(String firstname, String lastname) {  
this.firstname = firstname;  this.lastname = lastname;
 } 
 public String getFirstname() {  
 return firstname;
 } 
 public String getLastname() {  
 return lastname;
 } 
 @Override
 public int hashCode() {  
 int hash = 7;
  hash = 83 * hash + Objects.hashCode(this.firstname);
  hash = 83 * hash + Objects.hashCode(this.lastname);  return hash;
 } 
 @Override
 public boolean equals(Object obj) {  
 if (this == obj) return true;  if (obj == null) return false;  if (getClass() != obj.getClass()) return false;  final Person other = (Person) obj;  if (!Objects.equals(this.firstname, other.firstname)) {   return false;
  }  return Objects.equals(this.lastname, other.lastname);
 } 
 @Override
 public int compareTo(Person that) {  
 if (this == that) return 0;  else if (that == null) return 1;  int comparison = this.firstname.compareTo(that.firstname);  if (comparison != 0) return comparison;
  comparison = this.lastname.compareTo(that.lastname);  return comparison;
 } 
 @Override
 public String toString() {  
 return firstname + " " + lastname;
 }
}

// Main.java
public class Main { public static void main(String... args) {  final Set
  people = new HashSet<>();
  people.add(new Person("Adam", "Johnsson"));
  people.add(new Person("Adam", "Samuelsson"));
  people.add(new Person("Ben", "Carlsson"));
  people.add(new Person("Ben", "Carlsson"));
  people.add(new Person("Cecilia", "Adams"));
  people.stream()
   .sorted()
   .forEachOrdered(System.out::println);
 }
}

// Person.java
public class Person { 
private final String firstname; 
 private final String lastname; 
 public Person(String firstname, String lastname) { 
 this.firstname = firstname; this.lastname = lastname;
 }
 public String getFirstname() { 
 return firstname;
 } 
 public String getLastname() { 
 return lastname;
 } 
 public final static Comparator COMPARATOR =
 Comparator.comparing(Person::getFirstname)
 .thenComparing(Person::getLastname); public final static Function TO_STRING =
 p -> p.getFirstname() + " " + p.getLastname();
}

// Main.java
public class Main { 
public static void main(String... args) {  
  final Set
  people = new TreeSet<>(Person.COMPARATOR);
  people.add(new Person("Adam", "Johnsson"));
  people.add(new Person("Adam", "Samuelsson"));
  people.add(new Person("Ben", "Carlsson"));
  people.add(new Person("Ben", "Carlsson"));
  people.add(new Person("Cecilia", "Adams"));
  people.stream()
   .map(Person.TO_STRING)
   .forEachOrdered(System.out::println);
 }
}