Apar Industries Web Developer Interview Questions and Answers

Inheritance in Java allows a class to inherit properties and behaviors from another class.

• Inheritance is achieved using the 'extends' keyword in Java.

• Subclasses can access the methods and fields of their superclass.

• Java does not support multiple inheritance, but a class can implement multiple interfaces.

Use SQL query with ORDER BY and LIMIT to find the last element in a table.

• Use ORDER BY column_name DESC to sort the data in descending order.

• Use LIMIT 1 to retrieve only the last element.

HTML5 is the latest version of HTML with new features and improvements.

• HTML5 supports new elements like <video>, <audio>, and <canvas> for multimedia content.

• HTML5 introduces new APIs like Geolocation, Web Storage, and Web Workers for enhanced functionality.

• HTML5 includes improvements in semantics, accessibility, and performance compared to HTML.

Find min and max from List of Integers using Java 8 streams.

• Use the `stream()` method on the List to create a stream of integers.

• Use the `min()` method to find the minimum value.

• Use the `max()` method to find the maximum value.

Find 2nd largest element using Java 8 streams from a list of integers.

• Sort the list of integers in descending order using streams.

• Skip the first element to get the second largest element.

Increase the values of a list of integers by 2 and create a new list.

• Iterate through the list of integers

• For each integer, add 2 to its value

• Create a new list with the updated values

Java has introduced several new features in recent versions.

• Java 8 introduced lambda expressions, which allow for functional programming.

• Java 8 also introduced the Stream API for processing collections of data.

• Java 9 introduced the module system, which provides better encapsulation and modularity.

• Java 10 introduced local variable type inference, allowing the omission of explicit type declarations.

• Java 11 introduced the...read more

The @Component and @Repository annotations are used in Spring Framework for different purposes.

• Both annotations are used to define beans in the Spring container.

• @Component is a generic stereotype annotation for any Spring-managed component.

• @Repository is a specialization of @Component used for DAO classes.

• The @Repository annotation provides additional exception translation for data access exceptions.

• Using @Repository i...read more

The @Entity annotation is used in Java to mark a class as an entity, which represents a table in a relational database.

• The @Entity annotation is part of the Java Persistence API (JPA) and is used in object-relational mapping (ORM) to map Java objects to database tables.

• It is typically used in conjunction with other JPA annotations like @Table, @Column, and @Id.

• The @Entity annotation is used to define the entity name, s...read more

The database is configured by setting up the necessary parameters and configurations to ensure proper functioning and performance.

• Database configuration involves defining the database schema, tables, and relationships.

• It includes setting up indexes and constraints for data integrity.

• Configuring database security measures like user access control and permissions.

• Tuning database performance by optimizing query execution ...read more

Dockerfile is a text file that contains instructions to build a Docker image.

• Dockerfile is used to automate the creation of Docker images.

• It specifies the base image, dependencies, environment variables, and commands to run.

• Each instruction in the Dockerfile creates a new layer in the image.

• Dockerfile can be version controlled and shared to ensure consistent builds.

• Example: FROM ubuntu:latest RUN apt-get update && apt-...read more

CI/CD is a software development practice that enables frequent and automated code integration, testing, and deployment.

• CI/CD stands for Continuous Integration and Continuous Deployment.

• It involves automating the process of integrating code changes, running tests, and deploying the application.

• CI/CD helps in reducing manual errors, improving code quality, and increasing development speed.

• Tools like Jenkins, GitLab CI/CD...read more

Mutable classes in Java are classes whose state can be modified after creation.

• Mutable classes allow changing their internal state

• They can have mutable fields or methods that modify their state

• To create a mutable class, define fields with non-final modifiers

• Provide public methods to modify the state of the class

I am satisfied with management's view on cost cutting as they have implemented effective strategies to reduce expenses without compromising quality.

• Management has successfully implemented cost cutting measures without affecting the quality of products or services

• They have involved employees in the cost cutting process to gather valuable insights and suggestions

• Management regularly reviews and adjusts cost cutting strat...read more