Enterprise Minds Interview Questions and Answers

Q1. How can you make a class Immutable.
Ans. 
To make a class Immutable, we need to ensure that its state cannot be modified after creation.
• Make all fields final and private

• Do not provide any setters

• Ensure that any mutable objects are not exposed through getters

• Make the class final or use private constructor to prevent subclassing

• Override equals() and hashCode() methods to ensure that objects can be compared based on their state
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Q2. We are given List of Integers, we have to replace odd numbers with it's square using stream
Ans. 
Replace odd numbers with their square using stream on a given List of Integers.
• Use stream() method to convert the List of Integers into a stream.

• Use map() method to apply the square function to each odd number.

• Use filter() method to filter out even numbers.

• Use collect() method to convert the stream back to a List.

• Example: List numbers = Arrays.asList(1, 2, 3, 4, 5); numbers.stream().map(n -> n % 2 == 0 ? n : n * n).col
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Q3. Difference between Spring and Spring Boot
Ans. 
Spring is a framework for building Java applications, while Spring Boot is a tool for simplifying and automating the configuration of Spring applications.
• Spring provides a comprehensive framework for building Java applications, including features such as dependency injection, AOP, and MVC.

• Spring Boot is built on top of Spring and provides a streamlined way to configure and run Spring applications, with features such as...read more
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Q4. There are 2 beans, how to select one of them
Ans. 
Choose based on requirements and configuration
• Identify the requirements for the bean

• Check the configuration of both beans

• Choose the bean that meets the requirements and has the appropriate configuration
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Q5. Difference between @Qualifier and @ Primary
Ans. 
The @Qualifier annotation is used to differentiate between beans of the same type, while @Primary is used to give priority to a bean.
• Both annotations are used to resolve ambiguity when multiple beans of the same type are present.

• @Qualifier is used to specify a unique identifier for a bean, which can be used to inject that specific bean.

• @Primary is used to give priority to a bean when multiple beans of the same type are...read more
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Q6. What are annotations
Ans. 
Annotations are a form of metadata that provide additional information about code.
• Annotations are denoted by the '@' symbol and can be applied to classes, methods, fields, and parameters.

• They can be used to provide information to the compiler, tools, and runtime environments.

• Examples of annotations include @Override, @Deprecated, and @SuppressWarnings.

• Annotations can also be used to create custom annotations for specif
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Q7. What is singleton Pattern
Ans. 
Singleton pattern restricts the instantiation of a class to one object.
• Used when only one instance of a class is required throughout the application

• Provides a global point of access to the instance

• Implemented by making the constructor private and providing a static method to access the instance

• Example: java.lang.Runtime#getRuntime()

• Example: Database connection pool
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Q8. Different CRUD operations
Ans. 
CRUD stands for Create, Read, Update, and Delete. These are the basic operations performed on data in a database.
• Create - inserting new data into the database

• Read - retrieving data from the database

• Update - modifying existing data in the database

• Delete - removing data from the database
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Q9. How to handle exception, if any 3rd party operation is down
Ans. 
Use try-catch block to handle the exception and provide fallback mechanism
• Wrap the 3rd party operation in a try-catch block

• Catch the specific exception thrown by the operation

• Provide a fallback mechanism to handle the exception

• Log the exception for debugging purposes
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Q10. Some coding assignments on Collections
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Q1. Introdue your self, project explanation
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Q2. Few technical question you previous project
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Q1. SQL scenario based questions
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Q2. Python list, python pandas and numpy
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Q1. React native context
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Q2. Redux toolkit architecture
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Was an easy question on leetcode which involved use of object in javascript.

Q1. Based on scalability questions and problems you have faced in past…
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