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  1. //2задача
  2. public class Main {
  3.     public static void main(String[] args) {
  4.         Student[] students = new Student[4];
  5.  
  6.         students[0] = new Student("Кожедуб", 19, true);
  7.         students[1] = new Student("Шабаева", false);
  8.         students[2] = new Student();
  9.         students[3] = new Student(students[0]);
  10.  
  11.         for (Student student : students) {
  12.             student.print();
  13.         }
  14.  
  15.         System.out.println("Средний возраст студента: " + Student.averageAge(students));
  16.         System.out.println("Количество студентов с задолженностями: " + Student.countStudents(students));
  17.     }
  18. }
  19.  
  20. class Student {
  21.     private String name;
  22.     private int age;
  23.     private boolean hasDebt;
  24.  
  25.     public Student() {
  26.         this("", 0, false);
  27.     }
  28.  
  29.     public Student(String name, int age, boolean hasDebt) {
  30.         this.name = name;
  31.         this.age = age;
  32.         this.hasDebt = hasDebt;
  33.     }
  34.  
  35.     public Student(String name, boolean hasDebt) {
  36.         this(name, 0, hasDebt);
  37.     }
  38.  
  39.     public Student(Student student) {
  40.         this.name = student.name;
  41.         this.age = student.age;
  42.         this.hasDebt = student.hasDebt;
  43.     }
  44.  
  45.     public String getName() {
  46.         return name;
  47.     }
  48.  
  49.     public int getAge() {
  50.         return age;
  51.     }
  52.  
  53.     public boolean hasDebt() {
  54.         return hasDebt;
  55.     }
  56.  
  57.     public static double averageAge(Student[] students) {
  58.         int t = 0;
  59.         int count = 0;
  60.         for (Student student : students) {
  61.             if (student.getAge() != 0) {
  62.                 t += student.getAge();
  63.                 count++;
  64.             }
  65.         }
  66.         return (double) t / count;
  67.     }
  68.  
  69.     public static int countStudents(Student[] students) {
  70.         int count = 0;
  71.         for (Student student : students) {
  72.             if (student.hasDebt()) {
  73.                 count++;
  74.             }
  75.         }
  76.         return count;
  77.     }
  78.  
  79.     public void print() {
  80.         System.out.println("Имя: " + name);
  81.         if (age != 0) {
  82.             System.out.println("Возраст: " + age);
  83.         }
  84.         if (hasDebt) {
  85.             System.out.println("Имеет долги.");
  86.         } else {
  87.             System.out.println("Нет долгов.");
  88.         }
  89.         System.out.println();
  90.     }
  91. }
  92.  
Success #stdin #stdout 0.13s 57772KB
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stdin
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Standard input is empty
stdout
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Имя: Кожедуб
Возраст: 19
Имеет долги.

Имя: Шабаева
Нет долгов.

Имя: 
Нет долгов.

Имя: Кожедуб
Возраст: 19
Имеет долги.

Средний возраст студента: 19.0
Количество студентов с задолженностями: 2
https://ideone.com/9arftr
language:
Java (HotSpot 12)
created:
12 days ago
visibility:
public

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