Presidio Solutions Pvt Ltd Full Stack Software Developer Interview Questions and Answers

Q1. Introduce yourself,core java
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Q1. Coding test, java , spring boot, Microservice,hibernate
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Q1. What is dependency injection
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Dependency injection is a design pattern in which components are given their dependencies rather than creating them internally.
• Dependency injection helps in achieving loose coupling between classes.

• It allows for easier testing and swapping of dependencies.

• There are three types of dependency injection: constructor injection, setter injection, and interface injection.
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Q2. What is solid principles
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SOLID principles are a set of five design principles that help developers create more maintainable and scalable software.
• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open/Closed Principle: Software entities should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Objects of a superclass should be replaceable with objects of its subclasses with...read more
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Q1. What is concurrent hashmap
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ConcurrentHashMap is a thread-safe implementation of the HashMap class in Java.
• ConcurrentHashMap allows multiple threads to read and write to the map concurrently without causing any data corruption.

• It achieves thread-safety by dividing the map into segments, each of which can be locked independently.

• ConcurrentHashMap is more efficient than using synchronized collections for concurrent access.

• Example: ConcurrentHashMap
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Q2. How is dependency injection different from dependency inversion
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Dependency injection is a design pattern where dependencies are provided to a class from the outside, while dependency inversion is a principle that states high-level modules should not depend on low-level modules, but both should depend on abstractions.
• Dependency injection is a technique to achieve dependency inversion.

• Dependency injection involves providing dependencies to a class from the outside, typically through ...read more
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Q3. If I add 2 same attribute values for a object to a set...will I see 2 objects in the set, if yes what changes you make to the code to insert unique objects to a set
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No, you will not see 2 objects in the set. To insert unique objects to a set, you can override the equals() and hashCode() methods in the object class.
• In a set, each element must be unique based on the equals() method. If you add 2 objects with the same attribute values, only one will be stored in the set.

• To ensure uniqueness, override the equals() and hashCode() methods in the object class. This will define how object...read more
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Q4. What is serialisation, externalisation, serializable
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Serialisation is the process of converting an object into a format that can be easily stored or transmitted. Externalisation is a way to customize the serialization process. Serializable is an interface in Java that allows objects to be serialized.
• Serialisation is the process of converting an object into a format that can be easily stored or transmitted

• Externalisation is a way to customize the serialization process

• Seri...read more
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Q5. Write a Generic method to add string or integer to List or List
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Create a generic method to add string or integer to List or List
• Create a generic method that takes a List and an element as input

• Use Java generics to specify the type of List and element

• Check the type of List and element, then add the element to the List
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Q1. I applied online for the post of software developer, interview was conducted by First IPO on behalf of Mindtree.
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Q2. Basics of OOPs, program o find out prime number, basic coding problem asks for output, closure, arrays in JavaScript
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Oops concept, basic javascript and react js coding question

Q1. React js and asp.net basic interview questions
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