Jio Jpam Interview Questions and Answers

Q1. Create one Spring boot controller from end to end. No need to create a spring boot project we just want to see the structure and end to end implementation.
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Q2. Write a java 8 program to get the characters from a string whose count is 2 or more than 2 e.g. input: baseball , output: b, a, l.
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Q3. Why you left your previous organization.
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Q4. What is the functional interface
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Q5. What are the OOPS concepts. and some questions related to inheritance.
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Q6. Asked about the project mentioned in CV (Client project) and asked its architecture.
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Q7. Various SQL join types
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Q1. Are you ready to relocate to job location
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Q2. Why are you leaving your previous organization.
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Q3. Expectation about salary
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Q1. Internal working of HashMap
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Q2. Features of java8
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Q3. Use of synchronized keyword
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Q4. Difference between failsafe and fail fast and also its implementation
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Q5. Coding question : sort an array, use of streams to find names from employee object whose salary is greater than 50000
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Q6. Difference between concurrent and generic collection
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Q7. What is string pool. What is string literal?
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Q8. Security measures used in your project
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Q9. What is difference between rest and soap
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Q10. What do u mean by REST state
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Q11. What is serialization? What is the way to stop serialization?
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Q1. Difference between failsafe and faifast
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Q2. Difference between concurrent and generic collection
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Q3. Security measures used in current project
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Q4. Why you are leaving your current organization and follow up questions on that
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Q1. Java 8 , java 11 and java 17 features?
Ans. 
Java 8 introduced lambda expressions, Java 11 added local-variable syntax for lambda parameters, and Java 17 included sealed classes and pattern matching.
• Java 8 introduced lambda expressions for functional programming.

• Java 11 added local-variable syntax for lambda parameters to simplify code.

• Java 17 included sealed classes to restrict inheritance and pattern matching for instanceof checks and type casts.
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Q2. Dispatcher servlet, design patterns
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Q3. @SpringbootApplication annotation, actuators
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Q4. String Coding question with java 8 features such as lambda function and stream api
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Q5. Number of words in a string
Ans. 
Count the number of words in a given string.
• Split the string by spaces and count the number of resulting elements.

• Handle edge cases like multiple spaces or empty strings.

• Consider punctuation marks as part of words unless specified otherwise.
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Q6. Microservice design patterns
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C++ ,Java , CAD , CNC programming, Data analytics

Q1. What product management ur doing
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Q2. Where did you undergo your technical traing
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Q3. Where did u place most of your focus when reviewing somebody else code
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Q4. What did you develop
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Q5. What was the project before you are doing
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Q1. Difference between hashmap and hash table
Ans. 
HashMap is non-synchronized and allows null values, while HashTable is synchronized and does not allow null values.
• HashMap is non-synchronized, meaning it is not thread-safe, while HashTable is synchronized and thread-safe.

• HashMap allows null values for both keys and values, while HashTable does not allow null keys or values.

• HashMap is generally preferred for non-thread-safe applications, while HashTable is used in mul
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Q2. Static block related questions
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Q3. Arraylist and linkedlist question
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Q1. Spring boot architechture
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Q2. Streams coding questions
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Q3. Second highest salary sql
Ans. 
To find the second highest salary in SQL, use the 'SELECT MAX(salary) FROM employees WHERE salary < (SELECT MAX(salary) FROM employees);'
• Use the MAX() function to find the highest salary in the table

• Use a subquery to find the maximum salary that is less than the highest salary

• Combine both queries to get the second highest salary
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Q4. Solid priciples
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Q5. Acid properties
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ACID properties are a set of properties that guarantee database transactions are processed reliably.
• ACID stands for Atomicity, Consistency, Isolation, Durability

• Atomicity ensures that all operations in a transaction are completed successfully or none at all

• Consistency ensures that the database remains in a consistent state before and after the transaction

• Isolation ensures that transactions are executed independently of...read more
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Q1. Circuit breaker pattern
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Q2. Aws S3 access via ECS
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Q1. Time Complexity
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Q2. Coding question and SQL queries
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