Complete Java SE 8 Developer Bootcamp - Polymorphism: Part 1

The video tutorial explains polymorphism in Java, highlighting its benefits like flexibility and future-proofing. It delves into the concept of substitutability, where a class can have the same interface but different implementations. Examples are provided to illustrate how polymorphism allows different object types to be used interchangeably. The tutorial also demonstrates practical applications in Java code, showing how polymorphism can simplify code management and enhance functionality.

What is the primary benefit of using polymorphism in Java applications?

• It increases the speed of the application.

• It makes applications more secure.

• It allows for more flexible and future-proof applications.

• It simplifies the syntax of the language.

What does the term 'polymorphism' mean in the context of programming?

• A class can only have one method.

• A class can have multiple constructors.

• A class can have the same interface but different implementations.

• A class can inherit from multiple parent classes.

How does polymorphism enhance the flexibility of a method in Java?

• By allowing methods to accept only one specific type of object.

• By allowing methods to accept objects only if they are of the same class.

• By allowing methods to accept any object type, regardless of its class.

• By allowing methods to accept objects of a specified type or any subtype.

In the example provided, why is it possible to assign an Employee object to a Person reference?

• Because Person is a subclass of Employee.

• Because Java allows any object to be assigned to any reference.

• Because Employee is a subclass of Person.

• Because they are unrelated classes.

What is a common use case for polymorphism in Java programming?

• To make the code more complex.

• To reduce the size of the code.

• To allow methods to accept different types of objects.

• To increase the speed of the program.

How does the inventory manager example illustrate the use of polymorphism?

• By showing how a method can only accept one type of object.

• By demonstrating how a method can accept different types of objects.

• By illustrating how objects cannot be substituted.

• By showing how polymorphism is not applicable in real-world scenarios.

Why might you not often write 'Person P = new Employee' in Java?

• Because it is less efficient.

• Because it is not allowed in Java.

• Because it is not a common practice to use polymorphism this way.

• Because it leads to syntax errors.