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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. class Person {
  6.  
  7.     private String name;
  8.     private String city;
  9.     private int age;
  10.  
  11.     public Person(String name, String city, int age) {
  12.         this.name = name;
  13.         this.city = city;
  14.         this.age = age;
  15.     }
  16.  
  17.     public int getAge() {
  18.     	return age;
  19.     }
  20.  
  21.     public String toString() {
  22.     	return "["+name+", "+ city + ", " + age + "]";
  23.     }
  24. }
  25.  
  26. class Persons {
  27.   private Persons() {}	
  28.   static Optional<Person> oldest(Person[] input) {
  29.   	return Arrays.stream(input).sorted(Comparator.comparing(Person::getAge).reversed()).findFirst();
  30.   } 	
  31. }
  32.  
  33. class Ideone
  34. {
  35. 	public static void main (String[] args) throws java.lang.Exception
  36. 	{
  37.         ArrayList<Person> aList = new ArrayList<Person>() {{
  38.  
  39.           add(new Person("Diana", "Dublin", 38));
  40.           add(new Person("Arthur","New York", 49));
  41.           add(new Person("Kim", "Katowice", 35));
  42.           add(new Person("Ghaffar","Lublin", 36));
  43.           add(new Person("Zach","Radom", 19));
  44.         }};
  45.  
  46.         System.out.println("The size of the list is:" + aList.size());
  47.         System.out.println("Oldest is: " + Persons.oldest(aList.toArray(new Person[0])));
  48.     }
  49. }
Success #stdin #stdout 0.17s 39312KB
comments (?)
stdin 
Standard input is empty
stdout 
The size of the list is:5
Oldest is: Optional[[Arthur, New York, 49]]
https://ideone.com/1kIm5t
language:
Java (HotSpot 12)
created:
3 years ago
visibility:
public

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