Happiest Minds Technologies Senior Software Developer Interview Questions and Answers

Q1. Why functional interface when we have interface
Ans. 
Functional interfaces provide a single abstract method for functional programming in Java.
• Functional interfaces allow for lambda expressions and method references to be used as instances of the interface.

• Interfaces with multiple abstract methods cannot be used for lambda expressions.

• Example: java.util.function.Function is a functional interface with a single abstract method apply().
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Q2. Java 8 explain all features in short
Ans. 
Java 8 introduced new features like lambda expressions, streams, functional interfaces, and default methods.
• Lambda expressions: Allows writing concise code by enabling functional programming.

• Streams: Provides a way to work with sequences of elements efficiently.

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

• Default methods: Allows adding new methods to interfaces without br
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Q3. If one functional interface can extend another interface
Ans. 
Yes, one functional interface can extend another interface in Java.
• Functional interfaces can extend other functional interfaces in Java.

• The child interface can have only one abstract method, but can inherit default methods from the parent interface.

• Example: interface Parent { void method1(); } interface Child extends Parent { void method2(); }
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Q1. No of divisions in cobol?
Ans. 
There are four divisions in COBOL: Identification Division, Environment Division, Data Division, and Procedure Division.
• Identification Division: Contains program name, author, and date.

• Environment Division: Specifies the hardware and software environment.

• Data Division: Defines the data structures used in the program.

• Procedure Division: Contains the actual program logic.
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Q2. What is GDG in JCL?
Ans. 
GDG stands for Generation Data Group in JCL, used to manage related datasets as a single unit.
• GDG is used in JCL to group related datasets together for easier management.

• It allows for easy referencing of datasets within the group using relative generation numbers.

• Example: MYDATA.GDG(+1) refers to the most recent generation in the GDG.

• Example: MYDATA.GDG(-1) refers to the previous generation in the GDG.
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Q1. Javascript basics, class and functional components, basic es6
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Q1. Promises, context api, redux and rest API
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Q1. Oops concepts,Exception handling,singleton class
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Q2. Spring boot questions
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Hello tell me about yourself

Q1. Java related questions
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Took assignment on react, nodejs, git

Q1. Asked question from my personal project like if we use asyn/await why you have use that? what the functionality
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