Java Classes Mastery Quiz

What is encapsulation in Java?

• The process of binding data with code that manipulates it.

• The ability of an object to take on many forms.

• A special method that is used to initialize objects.

• A technique to define different methods with the same name but different parameters.

Which of the following is true about constructors in Java?

• Constructors must have a return type.

• Constructors are used to destroy objects.

• Constructors can be overloaded.

• Constructors are called explicitly using the `new` keyword.

What is polymorphism in Java?

• The ability of a variable, function or object to take on multiple forms.

• The concept of wrapping data and code together into a single unit.

• A feature that allows a class to have more than one constructor.

• The process of naming a method in a subclass that is already present in the parent class.

Which of the following best describes method overloading?

• Changing the return type of a method without changing its parameters.

• Providing multiple methods in a class with the same name but different parameters.

• Overriding a method in a subclass to provide a specific implementation.

• Accessing methods of a class without creating an instance of the class.

How can encapsulation be achieved in Java?

• By using static methods.

• By making all members of a class public.

• By using interfaces.

• By making class variables private and providing public getter and setter methods.

What is the purpose of a constructor in Java?

• To create static methods.

• To initialize an object when it is created.

• To terminate an object.

• To inherit classes.

Which of the following statements is true about method overloading?

• It occurs during runtime.

• It can only be done in the same class.

• It requires that methods have different return types.

• It is a way to implement polymorphism in Java.

In the context of encapsulation, what is the significance of setter and getter methods in Java?

• They allow direct access to class fields.

• They are used to modify private fields from outside the class.

• They are static methods used to manipulate static fields.

• They are only used in interfaces.

Which of the following is NOT a characteristic of constructors in Java?

• Constructors have the same name as the class.

• Constructors can return values.

• Constructors can take parameters.

• Constructors are not inherited.

How does polymorphism benefit software development?

• It allows the software to be less flexible.

• It enables the software to be more scalable.

• It increases the complexity of the code.

• It restricts the usage of objects in different contexts.