Afcons Infrastructure Interview Questions and Answers

CSS is used to style HTML elements, while HTML is used to structure content on a webpage.

• HTML provides the structure and content of a webpage, while CSS provides the visual styling.

• HTML uses tags to define elements, while CSS uses selectors to target those elements.

• CSS can be used to change the color, font, size, and layout of HTML elements.

• HTML is used to create the skeleton of a webpage, while CSS is used to make it look visually appealing.

Arrays are a collection of elements of the same data type, stored in contiguous memory locations.

• Arrays can store multiple values of the same type.

• Elements in an array are accessed using their index.

• Arrays have a fixed size, which is determined at the time of declaration.

• Arrays can be used to store and manipulate data efficiently.

• Example: string[] names = {"John", "Jane", "Mike"};

A constructor is a special method that is used to initialize objects in a class.

• Constructors have the same name as the class they belong to.

• They are called automatically when an object is created.

• Constructors can have parameters to initialize object properties.

• They can be overloaded to have multiple versions with different parameters.

• Example: class Car { Car() { // constructor code } }

A style sheet is a document containing CSS rules that define how HTML elements should be displayed on a web page.

• Style sheets can be written in a separate file or embedded within an HTML document.

• CSS rules consist of a selector and a declaration block containing one or more property-value pairs.

• Selectors can target specific HTML elements, classes, IDs, or attributes.

• CSS can be used to control layout, typography, colors, and other visual aspects of a web page.

To find the middle element of a linked list, use the slow and fast pointer technique.

• Initialize two pointers, slow and fast, at the head of the linked list.

• Move the slow pointer by one step and the fast pointer by two steps until the fast pointer reaches the end of the list.

• The position of the slow pointer will be the middle element of the linked list.

OOP concepts in Java include inheritance, encapsulation, polymorphism, and abstraction.

• Inheritance allows a class to inherit properties and behavior from another class.

• Encapsulation involves bundling data and methods that operate on the data into a single unit.

• Polymorphism allows objects to be treated as instances of their parent class.

• Abstraction hides the implementation details and only shows the necessary features to the outside world.

Types of inheritance in object-oriented programming

• Single inheritance: a subclass inherits from only one superclass

• Multiple inheritance: a subclass inherits from multiple superclasses

• Multilevel inheritance: a subclass inherits from a superclass, which in turn inherits from another superclass

• Hierarchical inheritance: multiple subclasses inherit from a single superclass