Java Programming

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Inheritance in Java 📍 Inheritance allows a class to acquire properties and methods of another class. 📍 It promotes code reusability and hierarchical classification. 📍 The extends keyword is used to inherit from a class. Example: class Parent { void show() { System.out.println("This is the parent class"); } } class Child extends Parent { void display() { System.out.println("This is the child class"); } } public class Main { public static void main(String[] args) { Child obj = new Child(); obj.show(); // Inherited method obj.display(); // Child class method } } 🔗 More Java Resources: https://whatsapp.com/channel/0029VamdH5mHAdNMHMSBwg1s

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Polymorphism in Java 📍 Polymorphism allows a single interface to be used for different types of actions. 📍 It is of two types: Method Overloading (Compile-time Polymorphism) Method Overriding (Runtime Polymorphism) Method Overloading (Same method name, different parameters) class MathOperations { int add(int a, int b) { return a + b; } double add(double a, double b) { return a + b; } } Method Overriding (Same method in parent and child class) class Animal { void makeSound() { System.out.println("Animal makes a sound"); } } class Dog extends Animal { void makeSound() { System.out.println("Dog barks"); } } 🔗 More Java Resources: https://whatsapp.com/channel/0029VamdH5mHAdNMHMSBwg1s

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Java for Everything: ☕ Java + Spring = Enterprise Applications Java + Hibernate = Object-Relational Mapping Java + Android = Mobile App Development Java + Swing = Desktop GUI Applications Java + JavaFX = Modern GUI Applications Java + JUnit = Unit Testing Java + Maven = Project Management Java + Jenkins = Continuous Integration Java + Apache Kafka = Stream Processing Java + Apache Hadoop = Big Data Processing Java + Microservices = Scalable Services Best Programming Resources: https://topmate.io/coding/886839 All the best 👍👍

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Java programming syllabus

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This will help Crack your next Java Interview even if you have 5+ years of experience! 𝗧𝗼𝗽𝗶𝗰 𝟭: 𝗣𝗿𝗼𝗷𝗲𝗰𝘁 𝗳𝗹𝗼𝘄 𝗮𝗻𝗱 𝗮𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲 - Please tell me about your project and its architecture, Challenges faced? - What was your role in the project? Tech Stack of project? why this stack? - Problem you solved during the project? How collaboration within the team? - What lessons did you learn from working on this project? 𝗧𝗼𝗽𝗶𝗰 𝟮: 𝗖𝗼𝗿𝗲 𝗝𝗮𝘃𝗮 - String Concepts/Hashcode-Equal Methods - Immutability - OOP concepts - Serialization - Collection Framework - Exception Handling - Multithreading - Java Memory Model - Garbage collection 𝗧𝗼𝗽𝗶𝗰 𝟯: 𝗝𝗮𝘃𝗮-𝟴/𝗝𝗮𝘃𝗮-𝟭𝟭/𝗝𝗮𝘃𝗮𝟭𝟳 - Java 8 features - Default/Static methods - Lambda expression - Functional interfaces - Optional API - Stream API - Pattern matching - Text block - Modules 𝗧𝗼𝗽𝗶𝗰 𝟰: 𝗦𝗽𝗿𝗶𝗻𝗴 𝗙𝗿𝗮𝗺𝗲𝘄𝗼𝗿𝗸, 𝗦𝗽𝗿𝗶𝗻𝗴-𝗕𝗼𝗼𝘁, 𝗠𝗶𝗰𝗿𝗼𝘀𝗲𝗿𝘃𝗶𝗰𝗲, 𝗮𝗻𝗱 𝗥𝗲𝘀𝘁 𝗔𝗣𝗜 - Dependency Injection/IOC, Spring MVC - Configuration, Annotations, CRUD - Bean, Scopes, Profiles, Bean lifecycle - App context/Bean context - AOP, Exception Handler, Control Advice - Security (JWT, Oauth) - Actuators - WebFlux and Mono Framework - HTTP methods - JPA - Microservice concepts - Spring Cloud 𝗧𝗼𝗽𝗶𝗰 𝟱: 𝗛𝗶𝗯𝗲𝗿𝗻𝗮𝘁𝗲/𝗦𝗽𝗿𝗶𝗻𝗴-𝗱𝗮𝘁𝗮 𝗝𝗽𝗮/𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲 (𝗦𝗤𝗟 𝗼𝗿 𝗡𝗼𝗦𝗤𝗟) - JPA Repositories - Relationship with Entities - SQL queries on Employee department - Queries, Highest Nth salary queries - Relational and No-Relational DB concepts - CRUD operations in DB - Joins, indexing, procs, function 𝗧𝗼𝗽𝗶𝗰 𝟲: 𝗖𝗼𝗱𝗶𝗻𝗴 - DSA Related Questions - Sorting and searching using Java API - Stream API coding Questions 𝗧𝗼𝗽𝗶𝗰 𝟳: 𝗗𝗲𝘃𝗼𝗽𝘀 𝗾𝘂𝗲𝘀𝘁𝗶𝗼𝗻𝘀 𝗼𝗻 𝗱𝗲𝗽𝗹𝗼𝘆𝗺𝗲𝗻𝘁 𝗧𝗼𝗼𝗹𝘀 - These types of topics are mostly asked by managers or leads who are heavily working on it, That's why they may grill you on DevOps/deployment-related tools, You should have an understanding of common tools like Jenkins, Kubernetes, Kafka, Cloud, and all 𝗧𝗼𝗽𝗶𝗰𝘀 𝟴: 𝗕𝗲𝘀𝘁 𝗽𝗿𝗮𝗰𝘁𝗶𝗰𝗲 - The interviewer always wanted to ask about some design patterns, it maybe Normal design patterns like singleton, factory, or observer patterns to know that you can use these in coding Best Programming Resources: https://topmate.io/coding/886839 All the best 👍👍

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Java coding interview questions 1. Reverse a String: Write a Java program to reverse a given string. 2. Find the Largest Element in an Array: Find and print the largest element in an array. 3. Check for Palindrome: Determine if a given string is a palindrome (reads the same backward as forward). 4. Factorial Calculation: Write a function to calculate the factorial of a number. 5. Fibonacci Series: Generate the first n numbers in the Fibonacci sequence. 6. Check for Prime Number: Write a program to check if a given number is prime. 7. String Anagrams: Determine if two strings are anagrams of each other. 8. Array Sorting: Implement sorting algorithms like bubble sort, merge sort, or quicksort. 9. Binary Search: Implement a binary search algorithm to find an element in a sorted array. 10. Duplicate Elements in an Array: Find and print duplicate elements in an array. 11. Linked List Reversal: Reverse a singly-linked list. 12. Matrix Operations: Perform matrix operations like addition, multiplication, or transpose. 13. Implement a Stack: Create a stack data structure and implement basic operations (push, pop). 14. Implement a Queue: Create a queue data structure and implement basic operations (enqueue, dequeue). 15. Inheritance and Polymorphism: Implement a class hierarchy with inheritance and demonstrate polymorphism. 16. Exception Handling: Write code that demonstrates the use of try-catch blocks to handle exceptions. 17. File I/O: Read from and write to a file using Java's file I/O capabilities. 18. Multithreading: Create a simple multithreaded program and demonstrate thread synchronization. 19. Lambda Expressions: Use lambda expressions to implement functional interfaces. 20. Recursive Algorithms: Solve a problem using recursion, such as computing the factorial or Fibonacci sequence. Best Java Resources: https://whatsapp.com/channel/0029VamdH5mHAdNMHMSBwg1s Like for more ❤️

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