Randstad Software Developer Interview Questions and Answers

It's was MCQ based test

Q1. Tell me some of the oops concepts
Ans. 
Some OOP concepts include 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 implementation details and showing only the necessary features
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Q1. What is Guid Id please explain
Ans. 
A Guid Id is a globally unique identifier used in software development to uniquely identify objects or entities.
• Guid Ids are 128-bit integers represented as a hexadecimal string.

• They are typically used in databases, APIs, and various software systems to ensure uniqueness.

• Example: 6B29FC40-CA47-1067-B31D-00DD010662DA
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Q1. Discussion about salary
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Q1. Roles & Responsibilities
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Q2. Roles & Responsibilities
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Q1. What are your strengths & weakness
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Q1. Union and union all difference
Ans. 
UNION combines the results of two or more SELECT statements, while UNION ALL includes duplicates.
• UNION removes duplicate rows, while UNION ALL retains all rows including duplicates

• UNION is slower than UNION ALL as it performs a distinct operation

• UNION requires the same number of columns in the SELECT statements, while UNION ALL does not have this restriction
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Q2. What is generic and non-generic collections

Ans. 

Generic collections allow storing any type of data, while non-generic collections are type-specific.

• Generic collections can store any type of data, such as List or Dictionary.

• Non-generic collections are type-specific, like ArrayList or HashTable.

• Generic collections provide type safety and better performance compared to non-generic collections.

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