10+ RegisterKaro Interview Questions and Answers

SOLID principles are design principles for software development. Liskov principle ensures substitutability of objects.

• SOLID principles are a set of five design principles that help in creating maintainable and scalable software.

• Liskov principle, named after Barbara Liskov, states that objects of a superclass should be replaceable with objects of its subclasses without affecting the correctness of the program.

• It ensures that the behavior of the superclass is preserved in its s...read more

Dependency injection is a design pattern used to remove hard-coded dependencies and make code more modular and testable.

• Dependency injection is achieved by passing dependencies to a class or method through its constructor or method parameters.

• Advantages include increased modularity, easier testing, and reduced coupling between components.

• Examples of dependency injection frameworks include Spring and Guice for Java, and Angular for JavaScript.

• Dependency injection can also be d...read more

View is a virtual table that displays data from one or more tables. SP optimization can be done by reducing the number of joins and using proper indexing.

• View is a read-only table that is created by a query

• It can be used to simplify complex queries

• SP optimization can be done by reducing the number of joins

• Using proper indexing can also improve performance

Our organization uses a comprehensive framework that includes multiple technologies and tools for software development.

• Our framework includes front-end technologies like React and Angular for building user interfaces.

• For back-end development, we use Node.js and Spring Boot to create robust server-side applications.

• We also utilize databases such as MySQL and MongoDB for data storage and retrieval.

• Continuous integration and deployment are managed through tools like Jenkins and ...read more

Constructor is a special method used to initialize objects. There are default, parameterized and copy constructors.

• Default constructor is used to create an object with default values.

• Parameterized constructor is used to create an object with user-defined values.

• Copy constructor is used to create a new object as a copy of an existing object.

• Constructors can be overloaded to have multiple constructors with different parameters.

• Constructors do not have a return type and have the...read more

Different types of storage environments include cloud storage, on-premises storage, and hybrid storage solutions.

• Cloud storage: Data is stored on remote servers accessed over the internet, providing scalability and flexibility. Example: Amazon S3, Google Cloud Storage

• On-premises storage: Data is stored locally on physical servers within an organization's premises, offering control and security. Example: NAS devices, SAN storage

• Hybrid storage solutions: Combination of cloud an...read more

Program to merge two arrays of strings.

• Create a new array with size equal to sum of sizes of both arrays.

• Copy elements of first array to new array.

• Copy elements of second array to new array starting from the end of first array.

• Return the new array.

Inheritance is a way to create a new class from an existing class. Polymorphism allows objects of different classes to be treated as if they were of the same class.

• Inheritance allows a subclass to inherit properties and methods from a superclass.

• Polymorphism allows objects of different classes to be treated as if they were of the same class.

• Example of inheritance: class Car extends Vehicle. Car inherits properties and methods from Vehicle.

• Example of polymorphism: class Animal...read more

RAID stands for Redundant Array of Independent Disks. It is a data storage virtualization technology that combines multiple physical disk drive components into one or more logical units for the purposes of data redundancy, performance improvement, or both.

• RAID 0: Striping without parity, offers increased performance but no fault tolerance.

• RAID 1: Mirroring, offers fault tolerance by duplicating data on two or more drives.

• RAID 5: Striping with distributed parity, offers a bala...read more

Typecasting is converting one data type to another. Downcasting is casting a superclass to a subclass.

• Typecasting is done using (datatype) variable syntax.

• Downcasting requires explicit casting using subclass type.

• Typecasting can result in loss of data or precision.

• Downcasting can result in ClassCastException if the object is not an instance of the subclass.

Abstract methods are methods that are declared in a class but do not have an implementation.

• Abstract methods are used to define a common interface for a group of subclasses.

• They are declared using the 'abstract' keyword and do not have a body.

• Subclasses must provide an implementation for all abstract methods.

• Abstract classes can have both abstract and non-abstract methods.

• Abstract methods cannot be instantiated and can only be used through inheritance.