Difference Between Abstract Class And Abstract Method In Java
distinguishing abstract class and abstract method in Java
Difference Between Abstract Class And Abstract Method In Java
In Java, an abstract class is a class that cannot be instantiated on its own and may contain a mixture of abstract and non-abstract methods. Abstract methods, on the other hand, are methods within an abstract class that do not have an implementation and must be overridden by subclasses. Abstract classes serve as a blueprint for other classes to inherit from, whereas abstract methods ensure that subclasses provide their own implementation. The main distinction lies in the fact that an abstract class can contain both abstract and concrete methods, while an abstract method must be implemented in a subclass.
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1 - An abstract class in Java is a class that cannot be instantiated on its own and may contain both abstract and concrete methods. Abstract classes can have instance variables and constructors. On the other hand, an abstract method is a method declared in an abstract class that has no implementation and must be overridden in the subclass.
2) Abstract classes can have methods that are fully implemented, whereas abstract methods do not have a body (i.e., implementation details) and must be implemented by subclasses.
3) In Java, a class can extend only one abstract class but implement multiple interfaces. Abstract classes can have constructor methods, but interfaces cannot.
4) Abstract classes can provide partial implementation, allowing subclasses to only override specific methods. Abstract methods, however, require subclasses to implement all methods defined as abstract.
5) Abstract classes can contain both abstract and non abstract methods, giving more flexibility in designing the class hierarchy. Abstract methods, on the other hand, have to be fully implemented in subclasses.
6) Abstract classes are defined using the ‘abstract’ keyword in their class declaration, while abstract methods are defined using the ‘abstract’ keyword in their method signature.
7) Another key difference is that abstract classes can include method implementations, member variables, and constructors, whereas abstract methods are just declarations without any implementation.
8) Abstract classes can have non abstract methods along with abstract methods, providing default behavior that subclasses can use or override. Abstract methods, being purely abstract, have no default implementation.
By understanding these differences, students can gain a clear understanding of how to effectively use abstract classes and abstract methods in Java to create well structured and flexible software designs.
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