Combining composition and inheritance : Inheritance « Class Definition « Java Tutorial

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Java Tutorial » Class Definition » Inheritance 
5. 22. 11. Combining composition and inheritance
class {
  A(int i) {
    System.out.println("A constructor");
  }
}

class SubA extends {
  SubA(int i) {
    super(i);
    System.out.println("SubA constructor");
  }
}

class {
  B(int i) {
    System.out.println("B constructor");
  }
}

class SubB1 extends {
  SubB1(int i) {
    super(i);
    System.out.println("SubB1 constructor");
  }
}

class SubB2 extends {
  SubB2(int i) {
    super(i);
    System.out.println("SubB2 constructor");
  }
}

class SubB3 extends {
  SubB3(int i) {
    super(i);
    System.out.println("SubB3 constructor");
  }
}

// A cultural way of doing something:
class {
  C(int i) {
    System.out.println("C constructor");
  }
}

class SubC extends {
  private SubB1 subB1;
  private SubB2 subB2;
  private SubB3 subB3;
  private SubA subA;
  public SubC(int i) {
    super(i + 1);
    subB1 = new SubB1(i + 2);
    subB2 = new SubB2(i + 3);
    subB3 = new SubB3(i + 4);
    subA = new SubA(i + 5);
    System.out.println("SubC constructor");
  }
}

public class MainClass{
  public static void main(String[] args) {
    SubC x = new SubC(9);
  }

}
C constructor
B constructor
SubB1 constructor
B constructor
SubB2 constructor
B constructor
SubB3 constructor
A constructor
SubA constructor
SubC constructor
5. 22. Inheritance
5. 22. 1. Inheritance
5. 22. 2. Accessibility
5. 22. 3. Method Overriding
5. 22. 4. The extends Keyword
5. 22. 5. Deriving a Class
5. 22. 6. The keyword super represents an instance of the direct superclass of the current object.
5. 22. 7. Derived Class Constructors: Calling the Base Class Constructor
5. 22. 8. Overriding a Base Class Method
5. 22. 9. Type Casting
5. 22. 10. Inheritance, constructors and arguments
5. 22. 11. Combining composition and inheritance
5. 22. 12. Inheritance and upcasting.
5. 22. 13. Overloading a base-class method name in a derived class does not hide the base-class versions.
5. 22. 14. Cleanup and inheritance
5. 22. 15. Creating a Multilevel Hierarchy
5. 22. 16. Demonstrate when constructors are called in a Multilevel Hierarchy
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