Encapsulation in Java

What is the main purpose of encapsulation in Java?

A. To allow multiple inheritance 

B. To hide data and provide controlled access 

C. To increase runtime performance 

D. To make variables global

Which access modifier is commonly used to achieve encapsulation in Java?

A. public

B. private

C. protected

D. default

How can external classes access encapsulated data in Java?

A. Directly accessing private variables 

B. Using getter and setter methods 

C. Using constructors only 

D. By inheritance

Which of the following best demonstrates encapsulation?

A. Using extends keyword 

B. Declaring variables as public 

C. Wrapping data and methods inside a class 

D. Overriding methods in subclass

What will happen if a class has private variables but no getters or setters?

A. Compilation error 

B. Variables can still be accessed from outside 

C. Variables are completely hidden and inaccessible from outside 

D. JVM automatically generates getters and setters

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