Gibraltar Technologies Senior Software Engineer 2 Interview Questions and Answers

Q1. Java programming string, linked list
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Q2. Trees, threads, deadlocks, multithreading
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Q1. JAVA programming
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Q2. Unit tests for the written program
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Q1. Data Structures and Algorithms
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Q2. Unit tests in JAVA
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Unit tests in JAVA are used to test individual units or components of a software application.
• Unit tests are written to verify the behavior of a specific piece of code in isolation.

• They help ensure that each unit of code works correctly on its own.

• JUnit is a popular Java framework for writing and running unit tests.

• Mockito is often used in conjunction with JUnit for mocking dependencies in unit tests.
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Q1. Salary Negotiation
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Q2. About org policies
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Q1. It was Data structure and Algorithm round
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Q2. 1. Program to get a response as Excel column name for integer input. Input 1-> A, 2-> B, 3->C, ...26->Z,27->AA, 28->AB, 29->AC..52->AZ. 2. Find first no-repeating character in String. 3. Given a list of N...read more
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Program to convert integer to Excel column name, find first non-repeating character in a string, and create a map of last names with count of names.
• For converting integer to Excel column name, you can use a recursive function to map the remainder of the division by 26 to the corresponding letter.

• To find the first non-repeating character in a string, you can iterate through the string and use a HashMap to store the coun...read more
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Q1. Basic C++ related questions. 2 problems. Asked to open cpp.sh and code there and compile.
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Q1. Pointer related questions.
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Q2. 4 problems. Asked to code for 2 of them.
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Q1. Behavioral questions.
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Q1. What are your salary expectations?
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Q2. What is your family background?
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Q3. Share details of your previous job.
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Q4. Why are you looking for a change?
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Q5. What are your strengths and weaknesses?
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Q6. Tell me about yourself.
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Q1. Explain the difference between ArrayList and LinkedList in Java. When would you choose one over the other?
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Q2. What are the advantages and disadvantages of using Java’s synchronized keyword for thread synchronization? Can you explain how the ReentrantLock compares to synchronized?
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Q3. What is the difference between == and .equals() in Java? When should each be used, and what issues can arise from improper usage?
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Q4. How does the Java garbage collector work? Can you describe the different types of garbage collection algorithms available in Java?
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Q5. What are the main features of Java 8? Can you explain how lambdas and the Stream API have changed the way Java applications are written?
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Q6. Describe the differences between checked and unchecked exceptions in Java. Provide examples and explain how to handle them properly.
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Q7. What is the Java Memory Model, and how does it affect multithreading and synchronization? How does volatile help ensure memory visibility?
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Q8. Can you explain the difference between method overloading and method overriding in Java? Provide examples where each should be used.
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Q9. What are functional interfaces in Java? How do they work with lambda expressions? Provide an example of a custom functional interface.
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Q10. What is a Java Stream, and how does it differ from an Iterator? Explain how Streams can be used to process collections efficiently.
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Q11. Explain the concept of immutability in Java. How does the String class achieve immutability, and what are the advantages of immutable objects?
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Q12. What is the difference between final, finally, and finalize in Java? Provide examples to illustrate their usage.
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Q13. Explain the Singleton design pattern in Java. How can you implement it safely to ensure thread safety?
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Q14. What are Java annotations, and how are they used in frameworks like Spring? Explain the difference between built-in and custom annotations.
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Q15. How do Java Streams handle parallel processing? What are the potential pitfalls of using parallel streams, and how can they be mitigated?
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Q16. Explain the difference between ArrayList and LinkedList in Java. ArrayList is implemented as a dynamic array, while LinkedList is a doubly linked list. ArrayList provides fast random access (O(1) complexi...read more
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Q17. What are the advantages and disadvantages of using Java’s synchronized keyword for thread synchronization? The synchronized keyword ensures that only one thread can access a block of code at a time. It pr...read more
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Q18. What is the difference between == and .equals() in Java? == checks for reference equality, meaning it compares memory addresses. equals() checks for value equality, which can be overridden in user-defined...read more
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Q19. How does the Java garbage collector work? Garbage collection in Java automatically reclaims memory occupied by unused objects. The JVM has different types of GC algorithms, including Serial, Parallel, CMS...read more
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Q20. What are the main features of Java 8? Java 8 introduced lambda expressions, enabling functional-style programming. The Stream API allows efficient data processing with map, filter, and reduce operations. ...read more
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Q1. No any no any questions for sharing.
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Q2. Nothing questions for sharing
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Q3. Nothing to share have for interview
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Q4. Nothing to share for interview
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Q5. Nothing have to sharing
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Q1. Started with introduction
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Q2. Asked about projects
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Q3. Asked Architecture related questions and design pattern related questions
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Q4. If you have 1 million requests how will you manage that
Ans. 
I would use load balancing, caching, and scaling techniques to manage the 1 million requests.
• Implement load balancing to distribute requests evenly across multiple servers.

• Utilize caching to store frequently accessed data and reduce response times.

• Scale horizontally by adding more servers to handle the increased load.

• Optimize code and database queries to improve performance.

• Monitor system performance and make adjustmen
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Q5. React vs SAP UI5
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React is a popular JavaScript library for building user interfaces, while SAP UI5 is a framework for developing enterprise-ready web applications.
• React is more flexible and widely used in the industry.

• SAP UI5 is specifically designed for SAP applications and has built-in support for SAP technologies.

• React has a larger community and ecosystem with more resources and libraries available.

• SAP UI5 provides a consistent user...read more
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Q6. Node VS JAVA
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Node.js is a runtime environment for executing JavaScript code outside of a browser, while Java is a general-purpose programming language often used for building enterprise applications.
• Node.js is single-threaded and event-driven, making it ideal for handling asynchronous operations like I/O operations.

• Java is a statically typed language with a strong emphasis on object-oriented programming, making it suitable for larg...read more
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Q7. Multitenancy in sap btp
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Multitenancy in SAP BTP allows multiple customers to share the same application instance while keeping their data isolated.
• Multitenancy allows multiple customers (tenants) to use the same application instance.

• Each tenant's data is isolated and secure from other tenants.

• Tenants can customize their own settings, branding, and configurations within the shared application.

• SAP BTP provides tools and features to manage multi...read more
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Arrays and strings - 90 mins

Create Modules, railway reservation system - 60 mins

Q1. Difference between hashmap and hasptable
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Q2. Why typescript over javascript
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Q3. Find the percentage of increace in the quantity of item after making it price 20% extra
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Q4. What is normalization
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Q5. Date and time api available
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