HRH Next Services Java Developer Interview Questions and Answers

Quantitative Aptitude

Q1. To write syntax for a problem using any programming language.
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Q2. Tell me about your projects and Internship experience.
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Q1. Questions were related to Hobbies, extra curricular activities and some questions of analytical ability such as color cube, maths, etc. It was in general.
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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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