Encapsulation

What do you mean by Encapsulation ?

• A method of combining data and its associated function in the form of a single unit
• Use of only one function and multiple class variables
• Use of only one class variable and multiple methods
• Use of only one method and multiple classes

Which feature can be implemented using encapsulation ?

• Inheritance
• Abstraction
• Polymorphism
• Overloading

Normally all instance variables are given the qualifier _______

• public
• protected
• private
• static

A private instance variable

• can be modified by a method outside the class
• can be modified by a method outside the class if it is returned by a method
• can be modified by a method outside the class if it is a class type and returned by a method
• can be modified using the object name followed by dot and then the name of the instant variable

Which is the advantage of Encapsulation ?

• Only public methods are needed
• Making the class final causes no consequential changes to other code
• It changes the implementation without changing a class's contract and causes no consequential changes to other code
• It changes a class's contract without changing the implementation and causes no consequential changes to other code

Variables that are shared by every instances of a class are

• public variables
• private variables
• instance variables
• class variables

Which concept of java is achieved by combining methods and attributes into a class

• Encapsulation
• Inheritance
• Polymorphism
• Abstraction

How can Encapsulation be achieved ?

• Using Access Specifier
• Using only private members
• Using Inheritance
• Using Abstraction

Which among the following violates the principle of encapsulation almost always ?

• Local variables
• Global variables
• public variables
• Array variables

Which of the following concepts can be used for encapsulation in Java programs ?

• Wrapping data fields with methods
• Hiding data and internal methods using access modifiers in class
• Using interfaces
• All the above