[PDF] abstract class extend abstract class java example

An abstract class can have constructors like the regular class. And, we can access the constructor of an abstract class from the subclass using the super keyword. For example, abstract class Animal { Animal() { …. } } class Dog extends Animal { Dog() { super(); } }
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  • Can an abstract class extend an abstract class in Java?

    And an abstract class cannot be instantiated, only extended. An abstract class can extend another abstract class. And any concrete subclasses must ensure that all abstract methods are implemented. Abstract classes can themselves have concrete implementations of methods.

  • Can I extend abstract class in Java?

    In Java, abstract means that the class can still be extended by other classes but that it can never be instantiated (turned into an object).

  • Can abstract class extend multiple abstract classes?

    A class can implement multiple interfaces. A class can extend only one abstract class.
  • I earlier learned that abstract class can extend concrete class. Though I don't see the reason for it from JAVA designers, but it is ok. I also learned that abstract class that extends concrete class can make overriden methods abstract.
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abstract class in java Abstract Class in Java with example A class

So when we know that all the animal child classes will and should override this method then there is no point to implement this method in parent class. Thus