IGT Solutions Interview Questions and Answers

Multithreading is the ability of a CPU to execute multiple threads concurrently. Multitasking is the ability of an OS to run multiple tasks concurrently. Multiprocessing is the ability of a system to have multiple CPUs.

• Multithreading allows for concurrent execution of multiple threads within a single process.

• Multitasking allows for concurrent execution of multiple processes within an OS.

• Multiprocessing allows for concurrent execution of multiple processes across multiple CPUs...read more

String is Immutable means it cannot be changed once created.

• Immutable means unchangeable or cannot be modified.

• In programming, when we say string is immutable, it means that once a string object is created, its value cannot be changed.

• Any operation that appears to modify a string actually creates a new string object with the modified value.

• For example, if we concatenate two strings, a new string object is created with the concatenated value.

• This is different from mutable obje...read more

Graph data structure is a collection of nodes and edges that represent connections between them.

• Nodes represent entities and edges represent relationships between them

• Graphs can be directed or undirected

• Examples include social networks, road networks, and computer networks

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.

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 Shape { ... } class Circle extends Shape { ... }

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 the eat() method.

• Example: Function overloading in Java where mu...read more