OOPs concepts in java-visual

Which of the following OOP concepts is NOT represented in the image?

• Abstraction
• Encapsulation
• Polymorphism
• Inheritance

Answer explanation

The image shows a diagram of the OOP concepts abstraction, encapsulation, and polymorphism. Inheritance is not represented in the image.

Which of the following OOP concepts is represented by the arrow pointing from the Abstract Class to the Interface?

• Abstraction
• Encapsulation
• Polymorphism
• Inheritance

Answer explanation

The arrow pointing from the Abstract Class to the Interface represents the concept of inheritance. In OOP, inheritance is a way of creating a new class that inherits the properties and methods of an existing class. In this case, the Interface inherits the properties and methods of the Abstract Class.

What are the variables you define when creating a class?

• Attributes
• Methods
• Both attributes and methods
• None of the above

Answer explanation

The image shows a diagram of a class and its attributes. The attributes are the variables that you define when creating a class. The methods are the functions that you define when creating a class.

Which of the following OOP concepts is represented by the four circles in the image?

• Abstraction
• Encapsulation
• Polymorphism
• Inheritance

Answer explanation

The four circles in the image represent the four OOP concepts of abstraction, encapsulation, polymorphism, and inheritance. Polymorphism is the ability of an object to take on different forms. In the image, the four circles represent different forms of the same object.

Which of the following OOP concepts is represented by the arrows in the image?

• Abstraction
• Encapsulation
• Polymorphism
• Inheritance

Answer explanation

The arrows in the image represent the concept of inheritance. In OOP, inheritance is a way of creating a new class that inherits the properties and methods of an existing class. In this case, the Circle class inherits the properties and methods of the Shape class.

Which of the following OOP concepts is represented by the Abstraction and Encapsulation boxes in the image?

• Abstraction
• Encapsulation
• Both abstraction and encapsulation
• Neither abstraction nor encapsulation

Answer explanation

The Abstraction and Encapsulation boxes in the image represent the two OOP concepts of abstraction and encapsulation. Abstraction is the process of hiding the implementation details of an object from the outside world. Encapsulation is the process of grouping data and methods together into a single unit.

Which of the following OOP concepts is represented by the Message object in the image?

• Abstraction
• Encapsulation
• Polymorphism
• Inheritance

Answer explanation

The Message object in the image represents the OOP concept of polymorphism. Polymorphism is the ability of an object to take on different forms. In the image, the Message object can be either a Text Message or an Image Message.

Which of the following OOP concepts is represented by the arrows in the image?

• Abstraction
• Encapsulation
• Polymorphism
• Inheritance

Answer explanation

The arrows in the image represent the concept of inheritance. In OOP, inheritance is a way of creating a new class that inherits the properties and methods of an existing class. In this case, the Animal class inherits the properties and methods of the Object class.

Which of the following OOP concepts is represented by the four boxes in the image?

• Abstraction
• Encapsulation
• Polymorphism
• Inheritance

Answer explanation

The four boxes in the image represent the four OOP concepts of abstraction, encapsulation, polymorphism, and inheritance. Polymorphism is the ability of an object to take on different forms. In the image, the four boxes represent different forms of the same object.

Which of the following is the method body, enclosed between braces?

• return_type method_name (arg1, arg2, arg3)
• Body of the Method
• Any Number of Parameters
• Value to be returned

Answer explanation

The answer is clearly indicated in the image, as the method body is the text enclosed between the braces ({}). The other answer choices are either not part of the method body, or they are not enclosed between braces.