Persistent Systems Software Developer Interview Questions, Process, and Tips

Q1. Summation of numbers in an IntStream
Ans. 
Summation of numbers in an IntStream
• Use the 'sum()' method on the IntStream to calculate the sum of numbers

• Ensure the IntStream is properly initialized with numbers before calling 'sum()'

• Example: IntStream numbers = IntStream.of(1, 2, 3, 4, 5); int sum = numbers.sum();
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Q2. Strategy Design Pattern
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Q1. What is abstract class Difference between final,finally finalize Different types of polymorphism
Ans. 
Abstract class is a class that cannot be instantiated and may contain abstract methods.
• Abstract class cannot be instantiated directly.

• It may contain abstract methods that must be implemented by the subclass.

• Example: abstract class Shape { abstract void draw(); }
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Q1. I was asked to solve a puzzle and solve a coding question. I solved both but don't know why I was not selected.
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Q2. 1 puzzle 1 coding question related to pattern
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Goods questions were asked on problem solving.

Q1. Goroutines, Channels,
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Q2. Heap data structures
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Q1. Search sort algo
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Q2. Oops concept
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Q1. What is oops concepts?
Ans. 
Object-oriented programming concepts that focus on objects and classes to organize code and improve reusability and maintainability.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (class).

• Inheritance: Ability of a class to inherit properties and behavior from another class.

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

• Abstraction: Hiding the complex im...read more
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Q2. What is garbage collection ?
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Garbage collection is a process in programming where the system automatically reclaims memory occupied by objects that are no longer in use.
• Garbage collection helps in managing memory efficiently by automatically deallocating memory that is no longer needed.

• It reduces the risk of memory leaks and helps in preventing bugs related to manual memory management.

• Examples of programming languages with garbage collection inclu
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Q3. Encapsulation, polymorphism
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