Equifax Senior Java Developer Interview Questions and Answers

Hacker rank test objective and coding

Q1. Spribg boot annotations
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Q1. Java 8 stream api
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Q1. Asked program to return element in a balance array element. Solid design principle Springboot questions
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Q2. Asked grouping by stream program
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Q3. Spring questions
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Q4. How to remove autoconfiguration in springboot
Ans. 
To remove autoconfiguration in Spring Boot, exclude the specific autoconfiguration class from the application.
• Exclude the autoconfiguration class using @EnableAutoConfiguration annotation with exclude attribute

• Create a configuration class and exclude the specific autoconfiguration class using @EnableAutoConfiguration annotation

• Use application.properties or application.yml to exclude autoconfiguration classes
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Paper Test MCQs(Hibernate, Multithreading, Quantative Apptitute, Logical Reasoning,English Grammer check)

Q1. Basic string questions Spring boot questions
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Q1. Project disscussion Questions related to the project Java 8 Stream questions
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Q1. DESCRIBE TYPES JVM MEMORY.
Ans. 
JVM memory consists of Young Generation, Old Generation, and Permanent Generation.
• Young Generation: where new objects are allocated and aged before moving to Old Generation.

• Old Generation: where long-lived objects are stored.

• Permanent Generation: where metadata such as class definitions and method information are stored.
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Q2. DIFFERENCE BETWEEN INTERFACE AND ABSTRACT CLASS.
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Interface is a contract with no implementation, while abstract class can have some implementation.
• Interface cannot have any method implementation, while abstract class can have some method implementations.

• A class can implement multiple interfaces, but can only extend one abstract class.

• Interfaces are used to achieve multiple inheritance in Java.

• Abstract classes can have constructors, while interfaces cannot.

• Example: In...read more
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Q3. HOW TO CREATE OUR OWN IMMUTABLE CLASS? WHY IMMUTABLE CLASS
Ans. 
Immutable classes in Java are classes whose objects cannot be modified once they are created.
• Make the class final to prevent inheritance

• Make all fields private and final

• Do not provide setter methods for fields

• Ensure that any mutable objects within the class are also immutable
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Q4. WHAT IS DIFFERENCE BETWEEN COMPOSITION AND AGGREGATION ?
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Composition is a strong relationship where the child object cannot exist independently of the parent object, while aggregation is a weak relationship where the child object can exist independently.
• Composition is a 'has-a' relationship, where the child object is a part of the parent object.

• Aggregation is a 'has-a' relationship, where the child object is not a part of the parent object.

• In composition, the child object is...read more
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Q5. DIFFERENCE BETWEEN COMPARABLE AND COMPARATOR.
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Comparable is an interface used for natural ordering of objects, while Comparator is an interface used for custom ordering of objects.
• Comparable interface is implemented by the class whose objects are to be compared, while Comparator interface is implemented by a separate class.

• Comparable interface has a single method compareTo() for comparing objects, while Comparator interface has a single method compare() for custom...read more
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Q6. DIFFERENCE BETWEEN HASHMAP AND CONCURRENTHASH MAP
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HashMap is not thread-safe while ConcurrentHashMap is thread-safe.
• HashMap is not thread-safe and can lead to ConcurrentModificationException if modified during iteration.

• ConcurrentHashMap allows concurrent read and write operations without the need for external synchronization.

• ConcurrentHashMap achieves thread-safety by dividing the map into segments, allowing multiple threads to operate on different segments concurren...read more
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Q7. DIFFERENCE BETWEEN COLLECTION AND STREAM
Ans. 
Collections store data while streams process data in a functional way.
• Collections are used to store and manage groups of objects, while streams are used to process collections of objects.

• Collections are mutable, meaning you can add, remove, or modify elements, while streams are immutable and do not change the original data.

• Streams use functional programming concepts like map, filter, and reduce to process data efficien...read more
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Q8. IN WHICH SITUATION WE USE @PRIMARY AND @ QUALIFIER ?
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Use @Primary to specify a primary bean when multiple beans of the same type are present. Use @Qualifier to specify a specific bean when multiple beans of the same type are present.
• Use @Primary to indicate the primary bean to be used when multiple beans of the same type are present in the Spring application context.

• Use @Qualifier along with @Autowired to specify a specific bean to be injected when multiple beans of the ...read more
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Java8 stream api related problems to code in notepad

Question asked on DSA Deque and Set

They gave topic political scenario now in India

Q1. Most of questions from Core java, Oops Concept, Multi threading, Exception Handling, String, Immutability in Java, Interfaces and Abstraction.
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Q2. Spring framework, Spring Boot Annotations, Differences between different annotations
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Java 8 coding round. Lambda expressions, Coding with help of Stream Api