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Can an interface extend a concrete class?
A concrete class is a class that has an implementation for all of its methods. They cannot have any unimplemented methods. It can also extend an abstract class or implement an interface as long as it implements all their methods. In other words, we can say that any class which is not abstract is a concrete class.
Can you extend a class and implement an interface?
Note: A class can extend a class and can implement any number of interfaces simultaneously. Note: An interface can extend any number of interfaces at a time.
How an interface can be extended explain with an example?
Extending Interface in Java with Example Like classes, an interface can also extend another interface. This means that an interface can be sub interfaces from other interfaces. The new sub-interface will inherit all members of the super interface similar to subclasses. It can be done by using the keyword “extends”.
Can an interface be extended?
An interface can extend other interfaces, just as a class subclass or extend another class. However, whereas a class can extend only one other class, an interface can extend any number of interfaces.
Can a interface extend abstract class?
Interface can’t provide the implementation of an abstract class. Inheritance vs Abstraction: A Java interface can be implemented using the keyword “implements” and an abstract class can be extended using the keyword “extends”.
Can a concrete class extend an abstract class?
A concrete class is a class that has an implementation for all of its methods. They cannot have any unimplemented methods. They cannot have any unimplemented methods. It can also extend an abstract class or implement an interface as long as it implements all their methods.
Can a concrete class have an unimplemented method?
They cannot have any unimplemented methods. It can also extend an abstract class or implement an interface as long as it implements all their methods. It is a complete class and can be instantiated. In other words, we can say that any class which is not abstract is a concrete class.
Is the Java Concrete Class A concrete class?
Hence, it is a concrete class. Attention reader! Don’t stop learning now. Get hold of all the important Java Foundation and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready.