Valuefy Solutions Software Engineer Interview Questions and Answers

Q1. Life cycle of thread
Ans. 
Thread life cycle includes new, runnable, running, blocked, and terminated states.
• Thread is created in 'new' state

• It becomes 'runnable' when start() method is called

• Thread enters 'running' state when CPU starts executing its run() method

• It can go to 'blocked' state if it's waiting for a resource

• Finally, thread reaches 'terminated' state when run() method completes or stop() method is called
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Q2. İnternal working of hash map
Ans. 
Hash map is a data structure that stores key-value pairs and uses a hash function to map keys to their corresponding values.
• Hash map consists of an array of buckets, each containing a linked list of key-value pairs.

• When inserting a key-value pair, the hash function is used to determine the index of the bucket where the pair should be stored.

• To retrieve a value, the hash function is used to find the corresponding bucket...read more
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Q1. Salary expectations
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Q2. Why I want to change the job
Ans. 
Seeking new challenges, growth opportunities, and a better work-life balance.
• Looking for new challenges and opportunities to learn and grow

• Seeking a better work-life balance

• Interested in working with new technologies or in a different industry

• Wanting to advance career progression
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2 DSA Questions and questions from springboot for java

Q1. Build Project in springboot and asked questions from the same
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Q1. System design questions for High level design
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Q1. Behavioral round asked question about the organization.
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Basic java questions

Q1. Explain Linked list implementation and stack
Ans. 
Linked list is a data structure where each element points to the next element. Stack is a data structure that follows Last In First Out (LIFO) principle.
• Linked list implementation involves creating nodes with data and a pointer to the next node.

• Stack implementation involves pushing elements onto the stack and popping them off in reverse order.

• Example: Linked list - 1 -> 2 -> 3 -> NULL, Stack - push(1), push(2), push(3)
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Q2. Oops concepts in java
Ans. 
Oops concepts in Java refer to Object-Oriented Programming principles like Inheritance, Encapsulation, Polymorphism, and Abstraction.
• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability of a method to do different things based on the object it is acting upon.

• Abstraction: Hiding the imp...read more
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Pen Paper test aptitude test with 2 long answer questions

Q1. OOP Concepts- Polymorphism , what are its types
Ans. 
Polymorphism is the ability of a single function or method to operate on different types of data.
• Types of polymorphism: compile-time (method overloading) and runtime (method overriding)

• Compile-time polymorphism is achieved through function overloading, where multiple functions have the same name but different parameters

• Runtime polymorphism is achieved through function overriding, where a subclass provides a specific im...read more
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Q2. Coding question to find the first occurring letter in a string
Ans. 
Find the first occurring letter in a string
• Iterate through the string and store the count of each letter in a hashmap

• Return the first letter with count 1
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Q1. What are joins in sql
Ans. 
Joins in SQL are used to combine rows from two or more tables based on a related column between them.
• Joins are used to retrieve data from multiple tables based on a related column

• Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column
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Q2. Types of arrays in PHP
Ans. 
Types of arrays in PHP include indexed arrays, associative arrays, and multidimensional arrays.
• Indexed arrays: default type where each element is assigned a numeric index starting from 0.

• Associative arrays: elements are assigned a specific key instead of numeric index.

• Multidimensional arrays: arrays within arrays, creating a matrix-like structure.

• Example: $indexedArray = [1, 2, 3]; $associativeArray = ['key1' => 'value...read more
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Q1. Max number of non repeating consecutive characters in a given string
Ans. 
Find the maximum number of non-repeating consecutive characters in a given string.
• Iterate through the string and keep track of the current substring of non-repeating characters

• Update the maximum length of non-repeating characters as you iterate

• Return the maximum length found
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Q1. Life cycle of thread
Ans. 
Thread life cycle includes new, runnable, running, blocked, and terminated states.
• Thread is created in 'new' state

• It becomes 'runnable' when start() method is called

• Thread enters 'running' state when CPU starts executing its run() method

• It can go to 'blocked' state if it's waiting for a resource

• Finally, thread reaches 'terminated' state when run() method completes or stop() method is called
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Q2. İnternal working of hash map
Ans. 
Hash map is a data structure that stores key-value pairs and uses a hash function to map keys to their corresponding values.
• Hash map consists of an array of buckets, each containing a linked list of key-value pairs.

• When inserting a key-value pair, the hash function is used to determine the index of the bucket where the pair should be stored.

• To retrieve a value, the hash function is used to find the corresponding bucket...read more
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Q1. Salary expectations
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Q2. Why I want to change the job
Ans. 
Seeking new challenges, growth opportunities, and a better work-life balance.
• Looking for new challenges and opportunities to learn and grow

• Seeking a better work-life balance

• Interested in working with new technologies or in a different industry

• Wanting to advance career progression
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Given a text need to understand and solve

Some Java based and system design api was allowed to made

Q1. Introduction of myself
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Q2. Salary discussion was done
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