3. Вызов конструктора родителя super(...);

https://job4j.ru/profile/exercise/21/task-view/149

src/main/java/ru/j4j/inheritance/Base.java

@@ -0,0 +1,7 @@
+package ru.j4j.inheritance;
+
+public class Base {
+    public Base() {
+        System.out.println("Default Base constructor.");
+    }
+}

src/main/java/ru/j4j/inheritance/Child.java

@@ -0,0 +1,9 @@
+package ru.j4j.inheritance;
+
+public class Child extends Parent {
+    private String patronymic;
+    public Child(String name, int age, String patronymic) {
+        super(name, age);
+        this.patronymic = patronymic;
+    }
+}

src/main/java/ru/j4j/inheritance/Engineer.java

@@ -0,0 +1,10 @@
+package ru.j4j.inheritance;
+
+public class Engineer extends Profession {
+    private int experience;
+
+    public Engineer(boolean degree, int experience) {
+        super(degree);
+        this.experience = experience;
+    }
+}

src/main/java/ru/j4j/inheritance/Parent.java

@@ -0,0 +1,10 @@
+package ru.j4j.inheritance;
+
+public class Parent {
+    private String name;
+    private int age;
+    public Parent(String name, int age) {
+        this.name = name;
+        this.age = age;
+    }
+}

src/main/java/ru/j4j/inheritance/Profession.java

@@ -0,0 +1,9 @@
+package ru.j4j.inheritance;
+
+public class Profession {
+    private boolean degree;
+
+    public Profession(boolean degree) {
+        this.degree = degree;
+    }
+}

src/main/java/ru/j4j/inheritance/Programmer.java

@@ -0,0 +1,10 @@
+package ru.j4j.inheritance;
+
+public class Programmer extends Engineer {
+    private String programLang;
+
+    public Programmer(boolean degree, int experience, String programLang) {
+        super(degree, experience);
+        this.programLang = programLang;
+    }
+}

src/main/java/ru/j4j/inheritance/User.java

@@ -0,0 +1,7 @@
+package ru.j4j.inheritance;
+
+public class User extends Base {
+    public static void main(String[] args) {
+        User user = new User();
+    }
+}