Mphasis Senior Java Developer Interview Questions, Process, and Tips

Q1. Core Java questions and multithreading basics like executor service
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Q2. Spring boot error handling, simple questions on distributed systems
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Q3. Coding question. Requested to do in O(n ) time complexity as oppsed to O(n2) suggested by me.
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Q1. Given an array find all the numbers whose sum is 11 using streams only
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Q2. Spring boot basics, hibernate queries, what is native query
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Q1. Design patterns in Java, write a singleton class
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Q2. Spring IOC and AOP
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Q1. What are intermediate and terminal operations
Ans. 
Intermediate operations transform the elements of a stream, while terminal operations produce a result or side-effect.
• Intermediate operations include map, filter, sorted, distinct, etc.

• Terminal operations include forEach, collect, reduce, count, etc.

• Intermediate operations are lazy and do not execute until a terminal operation is called.

• Terminal operations trigger the processing of the stream and produce a result.
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Q2. Predefined functional interface
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Q3. Ways to create Thread
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Ways to create Thread in Java
• Extending the Thread class

• Implementing the Runnable interface

• Using Executor framework
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Q1. Comparable and comparator
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Q2. Singleton class
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Q3. Springboot questions were asked
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Q4. Java class loader
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Q5. Java 8 coding questions
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There were MCQ questions consists of different sections like Design Pattern,Java 8

Q1. Questions related to Multithreading,Design patterns
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Q2. Java coding questions
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Q1. Questions related to Multithreading
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Q2. Java coding questions
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Q1. Java 8, exception handling for method overriding, collections basic on HashMap , hash set, blocking queue. Transient volatile
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Q1. Write a spring boot rest controller
Ans. 
A Spring Boot REST controller is used to handle incoming HTTP requests and return appropriate responses.
• Create a new Java class annotated with @RestController

• Define request mapping annotations like @GetMapping, @PostMapping, @PutMapping, @DeleteMapping

• Inject dependencies using @Autowired annotation

• Return response using ResponseEntity or directly as method return value
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Q2. Write a code for get a reverse String having a comma separated value in java
Ans. 
Code to reverse a comma separated string in Java
• Split the input string by comma to get an array of strings

• Iterate through the array in reverse order and append each element to a new string with a comma

• Return the reversed comma separated string
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Q1. Java Springboot Microservices
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Q1. Questions on Java spring AWS and Kafka
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Q1. Current salary? Expected salary?
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