Mobicule Technologies Technical Analyst Interview Questions and Answers

String is immutable because it cannot be modified once created.

• Immutable objects are safer to use in multi-threaded environments.

• String pool in Java is possible because of immutability.

• StringBuffer and StringBuilder classes are used for mutable strings.

• Example: String s = "hello"; s.concat(" world"); // returns a new string, s remains unchanged.

Thread communication refers to the exchange of data between threads in a multi-threaded program.

• Threads can communicate through shared memory or message passing.

• Shared memory involves multiple threads accessing the same memory location.

• Message passing involves threads sending and receiving messages to/from a message queue.

• Synchronization mechanisms like locks and semaphores are used to ensure thread safety.

• Examples of ...read more

Exception handling is an important aspect of any project to ensure smooth functioning.

• We use try-catch blocks to handle exceptions.

• We log the exceptions to track and fix them.

• We also use custom exceptions to handle specific errors.

• We prioritize handling critical exceptions first.

• We regularly review and update our exception handling approach.

JCL Cond condition is used to specify a condition for executing a job step based on the status of a previous step.

• Cond is used in JCL to specify a condition for executing a job step based on the status of a previous step.

• It can be used to check for successful completion, non-zero return codes, or specific abend codes.

• Examples of Cond codes include COND=(0,NE), which checks for non-zero return codes, and COND=(4,LT), wh

I follow a structured process involving requirements gathering, analysis, design, implementation, testing, and deployment.

• Requirements gathering: Meet with stakeholders to understand needs

• Analysis: Analyze data and requirements to identify solutions

• Design: Create detailed design documents

• Implementation: Develop the solution according to design

• Testing: Conduct thorough testing to ensure quality

• Deployment: Roll out the s...read more

Angular is a JavaScript framework for building web applications.

• Developed and maintained by Google

• Uses TypeScript for building applications

• Provides a modular approach to building applications

• Uses directives, components, and services for building UI

• Example code:

OOPS Concepts are the fundamental principles of Object-Oriented Programming.

• Encapsulation - bundling of data and methods that operate on that data

• Inheritance - ability of a class to inherit properties and methods from a parent class

• Polymorphism - ability of objects to take on many forms

• Abstraction - hiding of complex implementation details from the user

• Example: A car object can have properties like color, model, and me...read more

Abstraction is hiding unnecessary details while encapsulation is hiding implementation details.

• Abstraction focuses on what an object does rather than how it does it.

• Encapsulation is the practice of keeping implementation details hidden from the user.

• Abstraction and encapsulation work together to create more modular and maintainable code.

• Example of abstraction: A car's dashboard shows only necessary information like spe...read more

Bubble sort is a simple sorting algorithm that repeatedly steps through the list, compares adjacent elements and swaps them if they are in the wrong order.

• Compare adjacent elements and swap them if they are in the wrong order

• Repeat this process until the list is sorted

• Time complexity is O(n^2)

• Example:

• int[] arr = {5, 2, 8, 12, 1};

• for (int i = 0; i < arr.length - 1; i++) {

• for (int j = 0; j < arr.length - i - 1; j++) ...read more