Kumori Technologies Backend Java Developer Interview Questions and Answers

Q1. Can you provide a basic self-introduction?
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Q2. Which project you working right now and what are the challenges
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Implementation of the Spring security

Q1. What is hashmap
Ans. 
HashMap is a data structure in Java that stores key-value pairs and allows fast retrieval of values based on keys.
• HashMap implements the Map interface in Java

• It allows null keys and values

• Keys in a HashMap must be unique

• Example: HashMap map = new HashMap<>()
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Q2. Internal Working of hashmap
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HashMap is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• HashMap uses the hashCode() method of keys to calc...read more
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Q3. Compare Throw vs Throws
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Throw is used to explicitly throw an exception in a method, while Throws is used to declare the exceptions that a method may throw.
• Throw is used within a method to throw an exception explicitly.

• Throws is used in the method signature to declare the exceptions that the method may throw.

• Throw is followed by an instance of Throwable class, while Throws is followed by the exception class names separated by commas.

• Example: t...read more
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Q4. Array vs Arraylist
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Arrays are fixed in size, while ArrayLists can dynamically resize. ArrayLists provide more flexibility and functionality.
• Arrays have a fixed size, while ArrayLists can dynamically resize.

• ArrayLists can easily add, remove, or modify elements, while arrays require manual shifting of elements.

• Arrays use [] syntax for declaration and initialization, while ArrayLists use the ArrayList class from the Java Collections framewo
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Q5. Arraylist vs LinkedList/Vector
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ArrayList is resizable array implementation, LinkedList is doubly linked list implementation, Vector is synchronized version of ArrayList.
• ArrayList is faster for accessing elements, LinkedList is faster for adding/removing elements in middle.

• ArrayList uses less memory than LinkedList due to contiguous memory allocation.

• Vector is thread-safe but slower than ArrayList due to synchronization overhead.
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Q6. Write a code for Iterate hashmap using iterator
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Iterate through a hashmap using an iterator in Java
• Create an iterator using the entrySet() method of the hashmap

• Use a while loop to iterate through the hashmap entries

• Access the key and value of each entry using the getKey() and getValue() methods
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An aptitude test is an exam used to determine an individual's skill or propensity to succeed in a given activity.

Q1. Tell me something about yourself?
Ans. 
I am a dedicated and experienced Backend Officer with a strong background in managing backend operations and ensuring smooth functioning of systems.
• Experienced in handling backend operations and maintaining databases

• Proficient in programming languages like Java and Python

• Skilled in troubleshooting and resolving technical issues

• Strong attention to detail and ability to work under pressure

• Excellent communication and team
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Q2. How do you handle stress, pressure, and anxiety?
Ans. 
I handle stress, pressure, and anxiety by practicing self-care, time management, and seeking support.
• I prioritize self-care activities such as exercise, meditation, and hobbies to reduce stress.

• I manage my time effectively by setting realistic goals, breaking tasks into smaller steps, and using productivity tools.

• I seek support from colleagues, mentors, or friends when facing challenging situations.

• I maintain a positiv...read more
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Q3. What are your strengths?
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My strengths include strong problem-solving skills, attention to detail, and ability to work well under pressure.
• Strong problem-solving skills: I have a knack for analyzing complex problems and finding effective solutions.

• Attention to detail: I pay close attention to even the smallest details to ensure accuracy and quality in my work.

• Ability to work well under pressure: I thrive in high-pressure situations and can rema...read more
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Q1. Tell me about your self
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Q2. What is your hobbies
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Q3. Why you join our company
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Q4. Tell me about your family
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Q1. Basic questions
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Q1. Economics questions
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