Mastering Java 17 Coding Questions: From Basics to Advanced with Real Projects

📚 Introduction:

Are you preparing for technical interviews or upgrading your Java skills?
This guide walks you through Java 17 coding questions — with structured file-based implementations hosted on my GitHub. These programs cover everything from basic logic to real-world problem-solving using Java 8+ features, including OOP, Streams, Records, Collections, Multithreading, and more.

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🔧 Topics Covered

✅ I. Core Java Programs (Beginner to Intermediate)

• Prime number, factorial (iterative/recursive)

• Fibonacci series

• Palindrome (number & string)

• Armstrong numbers

• Reverse string/number

• Sum of digits, FizzBuzz

• Anagram check, character count, first non-repeating character

📁 Directory: src/com/example/core/

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✅ II. Object-Oriented Programming in Java 17

• Inheritance and polymorphism with class hierarchy

• Encapsulation with private fields and getters/setters

• Singleton Design Pattern

• Record-based and sealed-class examples

📁 Directory: src/com/example/oop/

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✅ III. Collections Framework

• Frequency counter using HashMap

• Custom object sorting using Comparable and Comparator

• hashCode() and equals() best practices

📁 Directory: src/com/example/collections/

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✅ IV. Multithreading Concepts

• Creating threads with Runnable and Thread class

• Synchronized blocks and race condition prevention

• Producer-Consumer problem using both wait/notify and BlockingQueue

• Deadlock simulation and resolution

📁 Directory: src/com/example/multithreading/

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✅ V. Data Structures: Arrays, Linked Lists, Trees

• Singly/Doubly linked list: reverse, detect loop, merge sorted

• Binary Search Tree: insert, search, traversals (in/pre/post)

• Array rotations, missing number, sum of pairs, duplicates, min/max

• Advanced array logic: Kadane’s algorithm, XOR odd occurrence, move zeros

📁 Directory: src/com/example/ds/

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✅ VI. Java 8 and 17 Features

• Lambda expressions and custom functional interfaces

• Stream API: filter, map, reduce, collect, forEach

• Optional usage to avoid NullPointerException

• Record-based models and immutability

• Package-structured, modular Java code

📁 Directory: src/com/example/java8features/

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🚀 Sample Code Highlight – Stream API

List<String> names = Arrays.asList("Alice", "Bob", "Charlie", "David");
List<String> filtered = names.stream()
    .filter(name -> name.startsWith("A"))
    .collect(Collectors.toList());

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🗃️ GitHub Repository

Explore the full project:
🔗 https://github.com/sree2694/Practice-Java

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📈 Who Should Read This?

• Java Beginners preparing for interviews

• Professionals revisiting Java for coding rounds

• Anyone wanting a modular, file-based Java learning repo

• Learners interested in Java 8+ features with Java 17 compatibility

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🧩 What's Next?

✅ Adding JUnit test cases for each module
✅ Introducing Spring Boot mini projects
✅ Creating interactive CLI apps using these modules
✅ Dockerizing and deploying key algorithms for microservice design

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💬 Let’s Connect

If you liked this project or want to collaborate on more Java/AI projects:
💻 GitHub – @sree2694
✍️ Drop feedback or feature suggestions in Issues or Discussions tab!