20+ Issquared Inc Interview Questions and Answers

The four pillars of OOP are encapsulation, inheritance, polymorphism, and abstraction. Arrays are fixed-size data structures, while vectors are dynamic arrays. A queue can be implemented using two stacks.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Inheritance: Creating new classes based on existing classes, inheriting their attributes and methods.

• Polymorphism: Objects of different classes can be treated as objects of a common superclas...read more

Abstract class is a class with abstract methods, interface is a contract with only abstract methods. Array is fixed size, ArrayList is dynamic. Method overloading is same method with different parameters, overriding is redefining a method. OOP pillars are inheritance, encapsulation, polymorphism, abstraction. Deadlock is a situation where two or more processes are unable to proceed because each is waiting for the other to release a resource. Normalization is the process of or...read more

Object is an instance of a class with its own state and behavior, while constructor is a special method used to initialize objects.

• Object is created from a class using the 'new' keyword.

• Constructor is a special method with the same name as the class.

• Object has its own state (attributes) and behavior (methods).

• Constructor is used to initialize the state of an object when it is created.

• Example: Class Car { constructor(make, model) { this.make = make; this.model = model; } }

• Exam...read more

Abstraction focuses on hiding the implementation details while encapsulation focuses on bundling the data and methods that operate on the data into a single unit.

• Abstraction is the concept of hiding the complex implementation details and showing only the necessary features of an object.

• Encapsulation is the bundling of data and methods that operate on the data into a single unit.

• Abstraction allows for creating simple interfaces for complex systems, while encapsulation helps in...read more

DBMS stands for Database Management System. It is a software system that allows users to define, create, maintain and control access to databases.

• DBMS is a software system that manages databases.

• It allows users to define, create, maintain, and control access to databases.

• DBMS provides tools for data manipulation, retrieval, and security.

• Examples of DBMS include MySQL, Oracle, SQL Server, and PostgreSQL.

String builder is faster but not thread-safe, while string buffer is slower but thread-safe.

• String builder is recommended for single-threaded applications for better performance.

• String buffer is recommended for multi-threaded applications to ensure thread safety.

• Example: StringBuilder sb = new StringBuilder(); StringBuffer sbf = new StringBuffer();

The four pillars of object-oriented programming are encapsulation, inheritance, polymorphism, and abstraction.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Inheritance: Allowing a new class to inherit properties and behavior from an existing class.

• Polymorphism: The ability for objects of different classes to respond to the same message.

• Abstraction: Hiding the complex implementation details and showing only the necessary features of an ob...read more

The final keyword in OOP is used to restrict the user from changing the value of a variable, overriding a method, or inheriting from a class.

• Final variable: value cannot be changed once assigned

• Final method: cannot be overridden in child classes

• Final class: cannot be inherited by other classes

BSF graph explanation

• BFS (Breadth-First Search) is a graph traversal algorithm that explores all the neighbor nodes at the present depth before moving on to the nodes at the next depth.

• It uses a queue data structure to keep track of the nodes to visit next.

• BFS is often used to find the shortest path in an unweighted graph.

• Example: BFS can be used to find the shortest path in a maze from the starting point to the exit.

My typing speed is 80 words per minute.

• I have a typing speed of 80 words per minute.

• I am proficient in touch typing and can accurately type at a fast pace.

• I have experience in handling customer queries and providing quick responses through efficient typing skills.

AWS services are a collection of cloud computing services provided by Amazon Web Services. EC2 instances are virtual servers in the cloud. S3 buckets are storage containers for data. Link validation of S3 bucket ensures data integrity and security.

• AWS services are a collection of cloud computing services provided by Amazon Web Services.

• EC2 instances are virtual servers in the cloud that can be easily scaled up or down based on demand.

• S3 buckets are storage containers for data...read more

My typing speed is 70 words per minute.

• I have been practicing typing regularly to improve my speed.

• I am comfortable typing on both a keyboard and a touchscreen device.

• I am able to type accurately without looking at the keyboard.

• I have experience typing in various formats such as emails, documents, and chat messages.

Cyfuture provides a wide range of IT services including cloud hosting, data center services, managed services, and cybersecurity solutions.

• Cloud hosting services

• Data center services

• Managed services

• Cybersecurity solutions

A resilient distributed database is a database that can continue to function even if some of its nodes fail.

• It is designed to be fault-tolerant and highly available.

• Data is distributed across multiple nodes to ensure redundancy.

• If one node fails, the database can continue to function using data from other nodes.

• Examples include Apache Cassandra, Riak, and HBase.

Data engineering is the process of designing, building, and maintaining the infrastructure for data storage and processing.

• Data engineering involves creating and managing data pipelines

• It includes tasks such as data modeling, data integration, and data warehousing

• Data engineers work with big data technologies such as Hadoop, Spark, and NoSQL databases

• They also ensure data quality, security, and scalability

• Examples of data engineering projects include building a data warehouse...read more

8% of 120 is 9.6

• To calculate 8% of 120, multiply 120 by 0.08

• The answer is 9.6

BPO stands for Business Process Outsourcing.

• It involves contracting a third-party service provider to handle specific business processes.

• Common BPO services include customer service, technical support, and back-office operations.

• BPO can help companies save costs and improve efficiency.

• Examples of BPO companies include Accenture, IBM, and Infosys.

Cloud services are services delivered through the internet, allowing users to access and store data remotely.

• Infrastructure as a Service (IaaS) - provides virtualized computing resources over the internet.

• Platform as a Service (PaaS) - offers a platform allowing customers to develop, run, and manage applications without the complexity of building and maintaining the infrastructure.

• Software as a Service (SaaS) - delivers software applications over the internet on a subscriptio...read more

Delhi Metro is a rapid transit system serving Delhi and its satellite cities in the National Capital Region of India.

• Delhi Metro is one of the largest metro networks in the world.

• It has a total length of over 389 kilometers and serves over 2.5 million passengers daily.

• The metro system has been praised for its cleanliness, safety, and efficiency.

• It has various lines connecting different parts of Delhi and neighboring cities like Gurgaon and Noida.