Wall Street Consulting Services Senior Java Developer Interview Questions and Answers

Q1. Tell me about yourself
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Q2. Year of experience
Ans. 
I have over 5 years of experience in Java development, focusing on building scalable applications and optimizing performance.
• Developed multiple web applications using Spring Boot and Hibernate.

• Implemented RESTful APIs for seamless integration with front-end applications.

• Worked on performance tuning and optimization of existing Java applications.

• Collaborated with cross-functional teams to deliver projects on time.
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Aptitude it is a type of test in which there are many questions like resigning, technical,blood relation.etc

In group discussion we have provided some topic and told discuss about that topic and tell advantages and dis advance.

Q1. What is final in java
Ans. It is a type of keyword when be declared this keyword in any variable then we can't use this variable into another class.
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Q2. What is static In java?
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Q3. The static it is a type of method called static method in which when we declared a method as static then it can't be inherited another class
Ans. 
Static methods belong to the class, not instances, and cannot be inherited by subclasses.
• Static methods are declared using the 'static' keyword.

• They can be called without creating an instance of the class.

• Example: 'ClassName.methodName()' can be used to call a static method.

• Static methods cannot access instance variables or instance methods directly.

• Example: If 'methodA' is static, it cannot call 'methodB' (non-static)...read more
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Q1. Are you okay with the salary?
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Q1. Java program for duplicate elements in array
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40 Minutes. 40 Question in office Test.
20 Questions Programming related and 20 Questions Aptitude

Basic Aptitude question were asked around 20 Question of Aptitude and 20 of basic debugging of C language code. Before aptitude there was a essay writing on "factors which increases the market of E-commerce platforms"

There were 4 coding question and 2 SQL questions. Basic pattern printing question and easy question of leetcode were there in coding and in SQL from "joins" topic.

Same as the previous round more question of Coding and SQL, plus in the starting they would ask about your tech stack and then assign you a stack for the same.

Q1. How Selection Sort Works.
Ans. 
Selection Sort is a simple sorting algorithm that repeatedly selects the smallest element from an unsorted portion and swaps it.
• 1. Start with the first element as the minimum.

• 2. Compare this minimum with the rest of the array to find the smallest element.

• 3. Swap the smallest found element with the first element.

• 4. Move to the next position and repeat the process for the remaining unsorted elements.

• Example: For array [6...read more
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Q2. How JOINs work in MYSQL
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Q3. Diffrence between Left JOIN and Inner JOIN
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