Nucleus Software Exports Assistant Software Engineer Interview Questions and Answers

Add two numbers without using a third variable by leveraging arithmetic operations.

• Use addition and subtraction: a = a + b; b = a - b; a = a - b.

• Example: For a = 5 and b = 3, after operations, a becomes 8 and b becomes 5.

• Use bitwise operations: a = a ^ b; b = a & b; a = a ^ b.

• Example: For a = 5 (0101) and b = 3 (0011), after operations, a becomes 8 (1000) and b becomes 0.

Inheritance is a concept in object-oriented programming where a class inherits properties and behaviors from another class.

• Allows for code reusability and promotes a hierarchical relationship between classes

• Derived class can access the members of the base class

• Types of inheritance include single, multiple, multilevel, and hierarchical

• Example: class Animal { ... } class Dog extends Animal { ... }

• Example: class Shap...read more

Polymorphism is the ability of a function or method to behave differently based on the object it is called with.

• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: Animal class with methods like eat() can be inherited by Dog and Cat classes which can override ...read more

OOP concepts include encapsulation, inheritance, polymorphism, and abstraction, forming the foundation of object-oriented programming.

• Encapsulation: Bundling data and methods in a class. Example: A class 'Car' with properties like 'speed' and methods like 'accelerate()'.

• Inheritance: Mechanism to create a new class from an existing class. Example: 'ElectricCar' inherits from 'Car'.

• Polymorphism: Ability to present t...read more

Collections in Java are frameworks that provide a way to store and manipulate groups of objects, including lists, sets, and maps.

• 1. Collections Framework: A unified architecture for representing and manipulating collections.

• 2. List: An ordered collection that allows duplicates. Example: ArrayList, LinkedList.

• 3. Set: A collection that does not allow duplicates. Example: HashSet, TreeSet.

• 4. Map: A collection of key-...read more

Generics allow classes, interfaces, and methods to be written with type parameters.

• Generics provide type safety and reduce code duplication.

• They allow for the creation of reusable code.

• Examples include List, Dictionary, and Nullable.

• Generics are used extensively in Java and C# programming languages.

Pillars of OOPs are Inheritance, Encapsulation, Abstraction, and Polymorphism.

• 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.

• Abstraction: Hiding the complex implementation details and showing only the necessary features.

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