UBS Java Developer Interview Questions, Process, and Tips

Q1. Quick sort - keep order same
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Q2. Reverse string with spaces but keep the space position intact
Ans. 
Reverse a string while keeping the position of spaces intact
• Split the string into an array of characters

• Iterate through the array and reverse the characters while keeping track of space positions

• Join the array back into a string
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Q1. 1) How do you achieve concurrency in your current job, and write code for it? 2) Write code for Rest API using Springboot, need to write Entity, Service, Repository, and Controller classes? 3)Volatile keyw...read more
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Answers to common Java Developer interview questions
• 1) Concurrency is achieved using multithreading in Java. Use threads, executors, or synchronized blocks. Example: using ExecutorService to run multiple tasks concurrently.

• 2) Rest API in Springboot: Entity class defines database table, Service class contains business logic, Repository class interacts with database, Controller class handles HTTP requests.

• 3) Volatile key...read more
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Q1. Java 8 features, functional Interfaces and predefined functional interfaces, Streams
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Q2. Collections, Aggregations, solid principles in Java
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Q3. Design patterns, singleton and factory explain in detail
Ans. 
Design patterns are reusable solutions to common problems in software design. Singleton ensures a class has only one instance, while factory creates objects without specifying the exact class.
• Design patterns are best practices for solving common software design problems.

• Singleton pattern ensures a class has only one instance and provides a global point of access to it.

• Factory pattern creates objects without specifying ...read more
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Q4. Spring functions, Spring Runners, Spring Exception handling
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Q5. Springboot annotations except common(any 5)
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Q6. Write spring boot program to accept json as request. write the logic and explain
Ans. 
Create a Spring Boot program to accept JSON requests and process the data.
• Create a Spring Boot application with a REST controller to handle incoming JSON requests.

• Use @PostMapping annotation to map the endpoint for accepting JSON requests.

• Use @RequestBody annotation to bind the incoming JSON data to a Java object.

• Process the JSON data as needed in the controller method.

• Return a response as JSON if required.
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3 coding questions were given and to be solved only in java

Java coding and apptitude questions

Q1. Tell me about project
Ans. 
I worked on a project to develop a web application for an e-commerce company.
• Developed the front-end using HTML, CSS, and JavaScript

• Implemented the back-end using Java and Spring framework

• Integrated payment gateway and order management system

• Optimized database queries for improved performance
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Q2. Tell about previous company
Ans. 
I worked at XYZ Company as a Java Developer.
• Developed and maintained Java applications for XYZ Company.

• Collaborated with a team of developers to implement new features and fix bugs.

• Used Java frameworks like Spring and Hibernate to build robust and scalable applications.

• Worked on database design and optimization using SQL.

• Participated in code reviews and provided feedback to improve code quality.

• Implemented unit tests t...read more
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