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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6. import java.util.ArrayList;
  7. import java.util.List;
  8. import java.util.Collections;
  9.  
  10. class Person implements Comparable<Person> {
  11.     private int salary;
  12.     private String name;
  13.  
  14.     public Person(String name, int salary) {
  15.         this.name = name;
  16.         this.salary = salary;
  17.     }
  18.  
  19.     public String getName() {
  20.         return name;
  21.     }
  22.  
  23.     public int getSalary() {
  24.         return salary;
  25.     }
  26.  
  27.     @Override
  28.     public String toString() {
  29.         return name + " " + salary;
  30.     }
  31.  
  32.     @Override
  33.     public int compareTo(Person person){
  34.         if (this.salary == person.getSalary())
  35.             return 0;
  36.         else if (this.salary < person.getSalary())
  37.             return 1;
  38.         else return -1;
  39.     }
  40. }
  41.  
  42. /* Name of the class has to be "Main" only if the class is public. */
  43. class Ideone
  44. {
  45.  
  46.     public static void main(String[] args) {
  47.         List<Person> people = new ArrayList<Person>();
  48.         people.add(new Person("Matti", 150000));
  49.         people.add(new Person("Pekka", 3000));
  50.         people.add(new Person("Mikko", 300));
  51.         people.add(new Person("Arto", 10));
  52.         people.add(new Person("Merja", 500));
  53.         people.add(new Person("Pertti", 80));
  54.         System.out.println(people);
  55.         /*
  56.          * When you have implemented the compareTo-method, remove comment below.
  57.          */
  58.         Collections.sort(people);
  59.         System.out.println(people);
  60.     }
  61. }
Success #stdin #stdout 0.09s 27852KB
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[Matti 150000, Pekka 3000, Mikko 300, Arto 10, Merja 500, Pertti 80]
[Matti 150000, Pekka 3000, Merja 500, Mikko 300, Pertti 80, Arto 10]
https://ideone.com/cI84w1
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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