fork(1) download
copy 
  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. public class Main
  6. {
  7. 	public static class Person {
  8. 		private String firstName, lastName;
  9. 		private Integer age;
  10.  
  11. 		public Person(String firstName, String lastName, Integer age){
  12. 			this.firstName = Objects.requireNonNull(firstName);
  13. 			this.lastName = Objects.requireNonNull(lastName);
  14. 			this.age = age;
  15. 		}
  16.  
  17. 		public void setFirstName(String firstname) { 
  18. 			this.firstName = Objects.requireNonNull(firstName);
  19. 		}
  20. 		public String getFirstName(){ return firstName;}
  21.  
  22. 		public void setLastName(String lastName) { 
  23. 			this.lastName = Objects.requireNonNull(lastName);
  24. 		}
  25. 		public String getLastName() { return lastName;}
  26.  
  27. 		public void setAge(Integer age) { this.age=age;}
  28. 		public Integer getAge(){ return age;}
  29.  
  30. 		public String toString(){
  31. 			return firstName+" "+lastName+" with age:"+age;
  32. 		}
  33.  
  34. 	}
  35.  
  36. 	public static void main (String[] args) throws java.lang.Exception
  37. 	{
  38. 		List<Person> people = new ArrayList<>();
  39. 		people.add(new Person("Nom","Faux",null));
  40. 		people.add(new Person("Toto", "Tata", 32));
  41. 		people.add(new Person("Nom", "Prenom", 44));
  42. 		people.add(new Person("Nom", "Prenom", null));
  43. 		Comparator<Person> comparator = Comparator
  44. 				.comparing(Person::getFirstName)
  45. 				.thenComparing(Person::getLastName)
  46. 				.thenComparing(Person::getAge, Comparator.nullsLast(Integer::compareTo));
  47. 		Collections.sort(people, comparator);
  48. 		people.stream().forEach(System.out::println);
  49. 	}
  50. }
Success #stdin #stdout 0.09s 842752KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Nom Faux with age:null
Nom Prenom with age:44
Nom Prenom with age:null
Toto Tata with age:32
https://ideone.com/VZYMDA
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!