LDT Technology Interview Questions, Process, and Tips

Spring Framework is a popular Java framework that provides comprehensive infrastructure support for developing Java applications.

• Provides dependency injection for managing components

• Offers support for aspect-oriented programming

• Includes modules for data access, web development, security, and more

• Facilitates integration with other frameworks like Hibernate and JPA

An interface in Java is a reference type, similar to a class, that can contain only constants, method signatures, default methods, static methods, and nested types.

• Interfaces are used to define a contract for classes that implement them.

• Classes can implement multiple interfaces, but can only extend one class.

• Interfaces are used to achieve abstraction and multiple inheritance in Java.

• Example: interface Animal { void eat

Polymorphism is the ability of a single function or method to operate on different types of data.

• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: Animal superclass with Dog and Cat subclasses, both implementing a makeSound method differently.

Types of exceptions include checked, unchecked, and errors.

• Checked exceptions are checked at compile time, like IOException.

• Unchecked exceptions are not checked at compile time, like NullPointerException.

• Errors are serious problems that should not be caught, like OutOfMemoryError.

Multithreading is the ability of a CPU to execute multiple threads concurrently, allowing for parallel processing.

• Multithreading allows for better utilization of CPU resources by running multiple threads simultaneously.

• Threads share the same memory space, allowing for communication and data sharing between threads.

• Examples of multithreading in Java include creating multiple threads to perform different tasks concurrent

Docker is a containerization platform that allows developers to package, deploy, and run applications in isolated environments.

• Docker attach allows you to attach to a running container's console output, while docker exec allows you to run a command inside a running container.

• Docker attach is used to view the output of a container, while docker exec is used to execute a command inside a container.

• Docker attach is used f...read more

To reset password of ec2, follow these steps:

• Log in to the AWS Management Console

• Navigate to the EC2 dashboard

• Select the instance for which you want to reset the password

• Stop the instance

• Detach the root volume

• Attach the root volume to another instance

• Modify the authorized_keys file

• Detach the volume from the second instance

• Attach it back to the original instance

• Start the instance

Answering salary related questions is inappropriate in an interview setting.

• It is not appropriate to ask about current or expected salary in an interview.

• Salary negotiations should be conducted after a job offer has been made.

• Focusing on salary can detract from discussing the candidate's qualifications and fit for the role.