Difference Between Public and Private Modifiers with Examples

The video tutorial explains the concept of access modifiers in programming, focusing on private, protected, and public modifiers. It highlights the restrictions and permissions each modifier provides, using real-world examples like credit card security to illustrate the importance of private modifiers. The tutorial also covers the protected modifier, explaining its use in subclasses and comparing it with default and public modifiers. Practical examples are provided to demonstrate how these modifiers work in code, emphasizing the importance of choosing the right modifier for security and functionality.

What is the main characteristic of a private access modifier in Java?

• It allows access from any class.

• It restricts access to the same class only.

• It allows access within the same package.

• It allows access from subclasses.

Which access modifier allows access to methods and variables within the same package?

• Public

• Default

• Protected

• Private

Why might a developer choose to use a private access modifier for sensitive data?

• To allow access from subclasses.

• To allow access within the same package.

• To prevent access from outside the class.

• To allow access from any class.

What is a key feature of the protected access modifier?

• It restricts access to the same class only.

• It allows access from any class.

• It allows access in subclasses and the same package.

• It allows access only within the same package.

How does the protected access modifier differ from the default modifier?

• Protected allows access only within the same package.

• Protected allows access from any class.

• Protected restricts access to the same class only.

• Protected allows access in subclasses outside the package.

Which access modifier would you use to ensure a method is accessible from any class?

• Public

• Default

• Protected

• Private

What happens if you try to access a default method from a class in a different package?

• It will be accessible if the method is public.

• It will be accessible if the class is a subclass.

• It will throw an error.

• It will be accessible.

Which access modifier should be used for a method that needs to be accessed by subclasses in different packages?

• Public

• Private

• Protected

• Default

What is the default access level if no modifier is specified?

• Private

• Protected

• Default

• Public

Which access modifier provides the most restrictive access?

• Default

• Public

• Private

• Protected