Infosys Java Developer Interview Questions, Process, and Tips

Q1. Advantages of Spring Boot
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Spring Boot simplifies the development of Java applications by providing a set of tools and conventions.
• 1. Rapid development: Spring Boot reduces the amount of boilerplate code needed, allowing developers to quickly build and deploy applications.

• 2. Opinionated defaults: Spring Boot provides sensible defaults for configuration, reducing the need for manual setup.

• 3. Embedded servers: Spring Boot includes embedded servers...read more
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Q2. Exlplain Normalisation
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Q1. OOPs based question
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Q2. String concatenate
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Q1. Explain OOPS concept are
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OOPS concepts are the foundation of object-oriented programming, including inheritance, encapsulation, polymorphism, and abstraction.
• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementatio...read more
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Q2. Comparable vs comparator explain
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Comparable is an interface used for natural ordering, while Comparator is an interface used for custom ordering in Java.
• Comparable interface is used to define the natural ordering of objects. It is implemented by the class whose objects are to be compared.

• Comparator interface is used to define custom ordering of objects. It is implemented by a separate class that compares objects of another class.

• Example: Comparable in...read more
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Q1. Whar are java 8 features
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Java 8 features include lambda expressions, functional interfaces, streams, default methods, and more.
• Lambda expressions allow you to write code in a more concise and readable way.

• Functional interfaces are interfaces with a single abstract method, used for lambda expressions.

• Streams provide a way to work with sequences of elements and perform operations on them.

• Default methods allow interfaces to have method implementa...read more
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Q2. Coding questions on string
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Filter specific location from a list using Java 8

Q1. Java collection use cases Hashmap working principle
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Hashmap is a key-value pair data structure in Java used for fast retrieval of data.
• Hashmap stores data in key-value pairs

• It uses hashing to store and retrieve data efficiently

• Allows null keys and values

• Example: HashMap<String, Integer> map = new HashMap<>()
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Q1. Based questions
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Q1. Get 2nd highest salary using stream
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Use stream to get 2nd highest salary in Java
• Sort the salaries in descending order using stream

• Skip the first salary to get the second highest salary
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