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  1. //2задача
  2. public class Main {
  3.     public static void main(String[] args) {
  4.         Person[] persons = new Person[4];
  5.  
  6.         persons[0] = new Person("Шторк", 19, true);
  7.         persons[1] = new Person("Филипп", false);
  8.         persons[2] = new Person();
  9.         persons[3] = new Person(persons[0]);
  10.  
  11.         for (Person person : persons) {
  12.             person.print();
  13.         }
  14.  
  15.         System.out.println("Средний возраст индивидуума: " + Person.averageAge(persons));
  16.         System.out.println("Количество мужчин: " + Person.countMales(persons));
  17.     }
  18. }
  19.  
  20. class Person {
  21.     private String lastName;
  22.     private int age;
  23.     private boolean isMale;
  24.  
  25.     public Person() {
  26.         this("", 0, false);
  27.     }
  28.  
  29.     public Person(String lastName, int age, boolean isMale) {
  30.         this.lastName = lastName;
  31.         this.age = age;
  32.         this.isMale = isMale;
  33.     }
  34.  
  35.     public Person(String lastName, boolean isMale) {
  36.         this(lastName, 0, isMale);
  37.     }
  38.  
  39.     public Person(Person person) {
  40.         this.lastName = person.lastName;
  41.         this.age = person.age;
  42.         this.isMale = person.isMale;
  43.     }
  44.  
  45.     public String getLastName() {
  46.         return lastName;
  47.     }
  48.  
  49.     public int getAge() {
  50.         return age;
  51.     }
  52.  
  53.     public boolean isMale() {
  54.         return isMale;
  55.     }
  56.  
  57.     public static double averageAge(Person[] persons) {
  58.         int totalAge = 0;
  59.         int count = 0;
  60.         for (Person person : persons) {
  61.             if (person.getAge() != 0) {
  62.                 totalAge += person.getAge();
  63.                 count++;
  64.             }
  65.         }
  66.         return (double) totalAge / count;
  67.     }
  68.  
  69.     public static int countMales(Person[] persons) {
  70.         int count = 0;
  71.         for (Person person : persons) {
  72.             if (person.isMale()) {
  73.                 count++;
  74.             }
  75.         }
  76.         return count;
  77.     }
  78.  
  79.     public void print() {
  80.         if (!lastName.isEmpty()) {
  81.             System.out.println("Фамилия: " + lastName);
  82.         }
  83.         if (age != 0) {
  84.             System.out.println("Возраст: " + age);
  85.         }
  86.         System.out.println("Пол: " + (isMale ? "Мужской" : "Женский"));
  87.         System.out.println();
  88.     }
  89. }
  90.  
Success #stdin #stdout 0.14s 57800KB
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stdin
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Standard input is empty
stdout
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Фамилия: Шторк
Возраст: 19
Пол: Мужской

Фамилия: Филипп
Пол: Женский

Пол: Женский

Фамилия: Шторк
Возраст: 19
Пол: Мужской

Средний возраст индивидуума: 19.0
Количество мужчин: 2
https://ideone.com/U2pwlh
language:
Java (HotSpot 12)
created:
12 days ago
visibility:
public

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