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Design Patterns Bootcamp (Videos + Notes)

  • SOLID Principles
  • Singleton, Factory, Abstract Factory
  • Builder, Strategy, Adapter
  • Observer, Template Method
  • Proxy & Dependency Injection
  • Java Example Implementation
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Graph Data Structure

  • Graph Representation & Traversal
  • BFS, DFS, Shortest Path and others
  • Step-by-Step Algorithm Explanation
  • Java, C++, Python, Javascript Implementation
  • Interview Focused Questions
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Popular Posts 📌

Java Interview Questions (10+ Years Experience)
SQL Interview Questions (10+ Years)
Java Interview Questions for Freshers
Complete Spring Data JPA Guide
Bit Manipulation & Bit Masking
Count set bits in an integer

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Popular Posts on Code Katha

Java Interview Questions for 10 Years Experience

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Welcome to the comprehensive guide on "Java Interview Questions for 10 Years Experience." Java has been one of the most popular programming languages for decades, and its widespread adoption means that the demand for skilled Java developers has never been higher. If you are someone who has been working with Java for the last decade, you have accumulated a wealth of experience and knowledge that you can showcase during interviews. Recommended  to read and brush up for your interview: Must know interview questions and concept for any Java Interview Spring boot interview Questions for 10 years experiance These simple and short articles help you to add AI to your resume and enhance the chance of selection: Java Spring Boot AI with Ollama Java Spring Boot AI with Open AI (Chat GPT) This blog post will provide you with a list of commonly asked interview questions for 10 years experienced Java developers. It will also include detailed answers to each question, with explanat...
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Sql Interview Questions for 10 Years Experience

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As an experienced SQL professional, you might encounter challenging questions during a job interview. In this blog post, we will explore 10 common SQL interview questions and provide in-depth explanations along with relevant examples. Let's dive in! Contents [ hide ] What is SQL Injection, and how can you prevent it? SQL Injection is a malicious attack where an attacker manipulates input data to execute unintended SQL statements. It can lead to unauthorized access, data breaches, and data manipulation. To prevent SQL Injection, follow these best practices: 1.1. Use Prepared Statements: Prepared statements or parameterized queries separate SQL code from data input, preventing attackers from injecting malicious SQL code. Here's an example in PHP: $stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username'); $stmt->bindParam(':username', $username); $stmt->execute(); 1.2. Sanitize User Input: Validate and sanitize user input ...
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Spring Boot Interview Questions for 10 Years Experience

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Welcome to the comprehensive guide on "Spring Boot Interview Questions for 10 Years Experience". Spring Boot has become one of the most popular frameworks for developing enterprise-grade applications, and its widespread adoption means that the demand for skilled Spring Boot developers has never been higher. If you are someone who has been working with Spring Boot for the last decade, you have accumulated a wealth of experience and knowledge that you can showcase during interviews. Recommended  to read and brush up for your interview: Must know interview questions and concept for any Java Interview Java Interview Questions for 10 Years Experience These simple and short articles help you to add AI to your resume and enhance the chance of selection: Spring Boot AI with Ollama Spring Boot AI with Open AI (Chat GPT) This blog post will provide you with a list of commonly asked interview questions for 10 years expe...
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Java interview questions - Must to know concepts

Contents [ hide ] How does Java achieve platform independence, and what is the underlying principle? Java programs can run on diverse operating systems and hardware setups without requiring modification. This feat is primarily achieved through the concept of the Java Virtual Machine (JVM). The Java Virtual Machine (JVM) The JVM acts as a bridge between the Java code you write and the underlying hardware and operating system . When you compile your Java code, it is translated into an intermediate form called bytecode, which is not tied to any specific platform. The JVM then comes into play. It takes this bytecode and dynamically translates it into machine-specific instructions that the host system can execute. This means that a Java program can be written once and executed on any system with the appropriate JVM for that system. Example: Running a Java Program on Different Platforms Consider a simple Java program that calculates the sum of two numbers: package codeKatha...
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Visual Studio Code setup for Java and Spring with GitHub Copilot

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Introduction- In this tutorial blog, we will explore the process of setting up and utilising Visual Studio Code for Java programming, as well as incorporating GitHub Copilot as a valuable coding tool. Visual Studio Code is a powerful and versatile code editor that offers a wide range of features and extensions for Java developers. By using Visual Studio Code for Java programming, developers can benefit from features such as code completion, debugging, and live coding. Additionally, with the integration of GitHub Copilot, developers can streamline their coding process with AI-assisted suggestions for code snippets and functions. This blog will provide a comprehensive guide for setting up and using these tools for Java development. Contents [ hide ] Setup Visual Studio Code for Java and Spring Visual Studio Code (VS Code) is an open-source code editor that supports a wide range of programming languages, including Java. It is a powerful tool...
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Spring AI with Ollama

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Introduction to Spring AI with Ollama Welcome to a comprehensive guide on leveraging Spring AI with Ollama to develop AI-driven applications using Java. This tutorial will cover everything from setting up Ollama locally, configuring your development environment, to creating an application that utilizes large language models for text generation. Contents [ hide ] Setting Up Ollama Installing Ollama To use Ollama locally, you must first install it on your machine. This involves downloading the Ollama software from the official repository and configuring it to run without Docker. Follow the installation instructions provided in the Ollama README file available on their official GitHub page . Ollama Download link Downloading the Mistral Model After setting up Ollama, you can download the Mistral model directly from the Ollama management interface. Mistral is designed for a broad range of applications, offering robust text generation capabilities. // Run this command in cl...
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Data Structures & Algorithms Tutorial with Coding Interview Questions

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About the Course This course offers comprehensive coverage of coding questions that serve as a solid foundation for understanding DSA concepts. These questions are frequently asked in coding interviews, either directly or with some variations, by many companies, including Adobe, Facebook (Meta), Paytm, Amazon, Google, and others. Our primary objective is to enhance your problem-solving skills and enable you to devise optimal solutions. The course includes a wide range of topics, such as Arrays, Strings, Searching and Sorting, Greedy Algorithms, Trees, Graphs, Dynamic Programming, and more. Upon completion, you will possess the necessary skills to ace DSA interviews for typical companies or excel in the initial rounds of product-based companies such as Google, Microsoft and similar others. We are started with Graph data Structure and add others soon. Contents [ hide ] Approach Our course is  organised into chapters ...
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Spring Data JPA

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Introduction- We will learn here Spring Data JPA, perform CRUD operation, Clear concept of Relationship mapping like one-to-many, many-to-one with Example. Spring Data JPA is a powerful framework that simplifies the process of working with relational databases in Java applications. It provides an easy-to-use API for working with JPA, allowing developers to focus on their business logic instead of worrying about the details of how JPA works. With Spring Data JPA, you can easily define entities that map to database tables, and then use them to perform CRUD (create, read, update, delete) operations on those tables. In addition, Spring Data JPA provides support for more advanced features like querying and pagination, making it an excellent choice for both small and large projects. Contents [ hide ] In this blog, we will explore Spring Data JPA by building a sample application that uses it to manage users and packs. But, before let...
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Topological Sort in Graph

Welcome to our beginner's guide to Topological Sort in Graph Theory! Topological Sort is an essential algorithm used to order the vertices of a directed graph such that for every directed edge uv from vertex u to vertex v, u comes before v in the ordering. Let's explore this important concept together! Contents [ hide ] Understanding the Problem Statement Before delving into Topological Sort, let's understand the problem it addresses. Consider a scenario where tasks depend on one another; for example, in a project where certain tasks must be completed before others can begin. Such dependencies can be modeled using directed graphs, where nodes represent tasks and directed edges represent dependencies between tasks. The goal of Topological Sort is to find a linear ordering of the vertices of the graph such that for every directed edge uv, the vertex u comes before the vertex v in the ordering. This ordering provides a sequence in which the tasks can be perf...
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Bit Manipulation and Bit Masking Concepts

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Introduction- A bit is the fundamental unit of information used in computing and digital communication.We generally worked on decimal numbers having values from 0,1,2.. to 9. Similarly binary system is characterized by two possible values, usually expressed as 0 or 1. In terms of electronic switch we can say 0 denotes an OFF switch and 1 denotes an ON switch. In terms of magnetic domain on a hard drive, we can say 0 denotes an unmagnetized domain, and 1 denotes a magnetized domain. Contents [ hide ] Uses of bit manipulation concepts in our coding Bit manipulation is a technique that can give programmers a significant performance advantage in certain algorithms. It can help to reduce the time complexity. By working directly with binary data using bitwise operators, we can perform operations faster than with traditional arithmetic operations. The reason for this is simple: computers understand binary data. When we perform any operation, it g...
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