[PDF] abstract class extends another abstract class in java

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. These methods are inherited just like a method in a non-abstract class.
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  • Can abstract classes extend each other?

    A class can implement multiple interfaces. A class can extend only one abstract class.

  • Can abstract class extends another non 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.

  • Can we extend two abstract class in Java?

    Java does not allow a class to extend multiple classes directly. The reason for this is to avoid the Diamond Problem, which occurs when a class inherits from two classes that have a common superclass. To avoid this issue, Java allows a class to implement multiple interfaces, which can achieve similar functionality.
  • A class can extend only one abstract class while a class can implement multiple interfaces. While adding new stuff to the interface, it is a nightmare to find all the implementors and implement newly defined stuff. In case of Abstract Class, you can take advantage of the default implementation.
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Untitled

Another example of Abstract class in java. • abstract class Bank{. • abstract int getRateOfInterest();. •. } • class SBI extends Bank{.