task 2

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

src/Main.java

@@ -1,5 +1,44 @@
+import base.Scientist;
+import senior.SeniorScientist;
+import junior.JuniorScientist;
+import engineer.Engineer;
+
+import java.util.ArrayList;
+
 public class Main {
     public static void main(String[] args) {
-        System.out.println("Hello world!");
+        Scientist s1 = new SeniorScientist(1000, 10);
+        Scientist s2 = new SeniorScientist(1000, 10); // дубликат s1
+        Scientist j1 = new JuniorScientist(800, 5);
+        Scientist j2 = new JuniorScientist(900, 6);
+        Scientist j3 = new JuniorScientist(800, 5);    // дубликат j1
+        Scientist e1 = new Engineer(700, 4);
+        Scientist e2 = new Engineer(700, 4);           // дубликат e1
+        Scientist e3 = new Engineer(750, 3);
+        Scientist s3 = new SeniorScientist(1100, 8);
+        Scientist j4 = new JuniorScientist(950, 7);
+
+        // Формирование списка уникальных объектов типа Scientist
+        ArrayList<Scientist> uniqueScientists = new ArrayList<>();
+
+        Scientist[] allScientists = { s1, s2, j1, j2, j3, e1, e2, e3, s3, j4 };
+
+        for (Scientist sc : allScientists) {
+            if (!uniqueScientists.contains(sc)) {
+                uniqueScientists.add(sc);
+            }
+        }
+
+        // В случае если уникальных объектов больше 9, выводим первые 9
+        int count = Math.min(uniqueScientists.size(), 9);
+
+        System.out.println("Величина надбавок и общая зарплата для уникальных научных сотрудников:");
+        for (int i = 0; i < count; i++) {
+            Scientist sc = uniqueScientists.get(i);
+            double bonus = sc.computeBonus();
+            double totalSalary = sc.getSalary() + bonus;
+            System.out.println("Объект " + (i+1) + ": " +
+                    "Надбавка = " + bonus + ", Общая зарплата = " + totalSalary);
+        }
     }
-}
+}

src/base/Scientist.java

@@ -0,0 +1,66 @@
+package base;
+
+public abstract class Scientist {
+    protected double salary;
+    protected int seniority;
+
+    public Scientist(double salary, int seniority) {
+        this.salary = salary;
+        this.seniority = seniority;
+    }
+
+    public double getSalary() {
+        return salary;
+    }
+
+    public void setSalary(double salary) {
+        this.salary = salary;
+    }
+
+    public int getSeniority() {
+        return seniority;
+    }
+
+    public void setSeniority(int seniority) {
+        this.seniority = seniority;
+    }
+
+    // Абстрактный метод вычисления надбавки
+    public abstract double computeBonus();
+
+    // Дополнительные методы
+    public void hire() {
+        System.out.println("Научный сотрудник принят на работу.");
+    }
+
+    public void fire() {
+        System.out.println("Научный сотрудник уволен.");
+    }
+
+    public void transfer() {
+        System.out.println("Научный сотрудник перемещён на новую должность.");
+    }
+
+    public void accrueSalary() {
+        double bonus = computeBonus();
+        double totalSalary = salary + bonus;
+        System.out.println("Начислена зарплата: " + totalSalary +
+                " (ставка: " + salary + ", надбавка: " + bonus + ")");
+    }
+
+    // Переопределение equals() и hashCode() для проверки уникальности
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        Scientist scientist = (Scientist) o;
+        return Double.compare(scientist.salary, salary) == 0 &&
+                seniority == scientist.seniority;
+    }
+
+    @Override
+    public int hashCode() {
+        return java.util.Objects.hash(getClass(), salary, seniority);
+    }
+}

src/engineer/Engineer.java

@@ -0,0 +1,16 @@
+package engineer;
+
+import base.Scientist;
+
+public class Engineer extends Scientist {
+
+    public Engineer(double salary, int seniority) {
+        super(salary, seniority);
+    }
+
+    @Override
+    public double computeBonus() {
+        double x = 0.01;
+        return salary * seniority * x;
+    }
+}

src/junior/JuniorScientist.java

@@ -0,0 +1,16 @@
+package junior;
+
+import base.Scientist;
+
+public class JuniorScientist extends Scientist {
+
+    public JuniorScientist(double salary, int seniority) {
+        super(salary, seniority);
+    }
+
+    @Override
+    public double computeBonus() {
+        double x = 0.02;
+        return salary * seniority * x;
+    }
+}

src/senior/SeniorScientist.java

@@ -0,0 +1,16 @@
+package senior;
+
+import base.Scientist;
+
+public class SeniorScientist extends Scientist {
+
+    public SeniorScientist(double salary, int seniority) {
+        super(salary, seniority);
+    }
+
+    @Override
+    public double computeBonus() {
+        double x = 0.03;
+        return salary * seniority * x;
+    }
+}