American InfoSource Senior Java Developer Interview Questions and Answers

Q1. Java 8 Default Method
Ans. 
Java 8 Default Method allows interfaces to have method implementations.
• Introduced in Java 8 to provide backward compatibility for interfaces

• Can have method implementations in interfaces using the 'default' keyword

• Used to add new methods to interfaces without breaking existing implementations
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Q2. Sort Array with given value
Ans. 
Sort array of strings with a given value
• Use Arrays.sort() method with a custom Comparator to sort the array based on the given value

• Handle cases where the given value is not present in the array

• Example: Sort array ['apple', 'banana', 'orange', 'grape'] with 'banana' as the given value
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Q3. SQL Queries on Joins
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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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Q1. Oops, Thread, Spring boot and hibernate
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Q2. JDBC vs HIBERNATE
Ans. 
JDBC is a low-level API for connecting to databases in Java, while Hibernate is a high-level ORM framework that simplifies database interactions.
• JDBC requires writing SQL queries manually, while Hibernate provides an object-oriented approach to database operations.

• Hibernate handles mapping Java objects to database tables, while JDBC requires manual mapping.

• Hibernate provides caching mechanisms for improved performance,...read more
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Q3. COLLECTION FRAMEWORK
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Q1. Project Related Questions
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Java8 stream api related problems to code in notepad

Q1. Why string immutable
Ans. 
String is immutable in Java to ensure security, thread safety, and optimization.
• Immutable strings prevent accidental changes to sensitive data like passwords.

• Immutable strings allow for safe sharing of data across multiple threads.

• Immutable strings enable string pooling for memory optimization.
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Q1. Questions about spring boot annotations
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