APPS Team Technologies Junior Software Developer Interview Questions and Answers

Recursive program of binary tree and basic HTML bootstrap

Basic aptitude followed with english and reasoning

Q1. Core java technical questions , spring , spring boot
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Q2. What is JIT in java
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Q3. Explain lifecyxle of thread in java
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The lifecycle of a thread in Java includes several stages from creation to termination.
• A thread is created using the Thread class or implementing the Runnable interface.

• The thread goes through the new, runnable, and blocked states before running.

• Once running, the thread can be paused, resumed, or stopped.

• Finally, the thread reaches the terminated state and cannot be restarted.
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Q1. Explain the acid properties
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ACID properties ensure reliable transactions in databases: Atomicity, Consistency, Isolation, Durability.
• Atomicity: Transactions are all-or-nothing. Example: If a bank transfer fails, no money is deducted.

• Consistency: Transactions must leave the database in a valid state. Example: A transaction should not violate any integrity constraints.

• Isolation: Transactions occur independently. Example: Concurrent transactions do ...read more
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Q2. Explain the indexing
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Indexing is a data structure technique that improves the speed of data retrieval operations on a database or data set.
• Indexing creates a data structure (like a B-tree) that allows for faster searches.

• For example, a book index helps locate topics quickly without scanning every page.

• In databases, an index on a column allows for quicker query results, e.g., searching for a user by email.

• Indexes can be unique (no duplicate...read more
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Q1. What is your minimum salary expectation?
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Q2. Are you planning to stay long-term in this position?
Ans. 
I am committed to long-term growth and contribution in this position, aligning my goals with the company's vision.
• I believe in building strong relationships with my team and the organization, which takes time and dedication.

• For example, I aim to take on increasing responsibilities and contribute to long-term projects.

• I am eager to develop my skills and grow within the company, ensuring I can add value over time.

• I see t...read more
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Q1. How internally work HashMap ?
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HashMap uses key-value pairs, hashing, and buckets for efficient data retrieval and storage.
• HashMap stores data in key-value pairs, where each key is unique.

• It uses a hash function to compute an index (hash code) for each key.

• The computed index points to a bucket in an array where the value is stored.

• If multiple keys hash to the same index (collision), they are stored in a linked list or tree structure.

• Example: For a k...read more
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Q2. Write the logic of prime number
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A prime number is a natural number greater than 1 that cannot be formed by multiplying two smaller natural numbers.
• A prime number has exactly two distinct positive divisors: 1 and itself.

• Examples of prime numbers include 2, 3, 5, 7, 11, and 13.

• The number 1 is not prime because it has only one positive divisor.

• The number 4 is not prime because it can be divided by 1, 2, and 4.

• To check if a number n is prime, test divisi...read more
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Q3. Difference between hash map and hash set?
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HashMap stores key-value pairs; HashSet stores unique keys without values.
• HashMap allows duplicate values but not duplicate keys. Example: {1: 'A', 2: 'B', 1: 'C'} results in {1: 'C', 2: 'B'}.

• HashSet only stores unique elements. Example: {1, 2, 2} results in {1, 2}.

• HashMap provides O(1) average time complexity for get and put operations.

• HashSet provides O(1) average time complexity for add, remove, and contains operati...read more
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Q1. Basic java questions
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Q2. Sql related questions
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Technical questions