Derived Class Constructors: Calling the Base Class Constructor : Inheritance « Class Definition « Java Tutorial

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Java Tutorial » Class Definition » Inheritance

5. 22. 7. Derived Class Constructors: Calling the Base Class Constructor


class Animal {

  public Animal(String aType) {

    type = new String(aType);

  }

  public String toString() {

    return "This is a " + type;

  }

  private String type;

}

class Dog extends Animal {

  public Dog(String aName) {

    super("Dog"); 

    name = aName; 

    breed = "Unknown"; 

  }

  public Dog(String aName, String aBreed) {

    super("Dog"); 

    name = aName;

    breed = aBreed;

  }

  private String name; 

  private String breed;

}

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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