Java Programming

Day 19/100

**Don’t get overwhelmed, Java is only this much** 🚀 1. *Variables* - int - double - float - boolean - char - String 2. *Data Types* - Primitive: int, float, char, boolean, long, double, byte, short - Reference: classes, arrays, interfaces 3. *Declaring Variables* - Syntax: type variableName = value; 4. *Expressions* - Arithmetic: +, -, *, /, % - Logical: &&, ||,! - Comparison: ==,!=, <, >, <=, >= 5. *Operators* - Arithmetic - Assignment (=, +=, -=, etc.) - Increment/Decrement (++/--) - Logical - Bitwise 6. *Control Structures* - if - else if - else - switch-case - break - continue 7. *Loops* - for - while - do-while - for-each (arrays/collections) 8. *Methods (Functions)* - Return types, void - Parameters - Method overloading - Static methods 9. *Objects and Classes* - Class declaration - Object creation (new) - Fields & methods - Constructors 10. *Inheritance & Polymorphism* - extends - super - Method overriding - Interfaces (implements) - Abstract classes 11. *Encapsulation* - private, public, protected - Getters & setters 12. *Abstraction* - Abstract classes - Interfaces 13. *Exception Handling* - try - catch - finally - throw - throws 14. *Arrays & Collections* - Arrays - ArrayList - LinkedList - HashMap - Set 15. *Generics* - List<String> - Map<Key, Value> 16. *Streams (Java 8+)* - Stream API - filter, map, collect 17. *Lambda Expressions* - (params) -> expression 18. *File I/O* - FileReader - FileWriter - BufferedReader - Scanner 19. *Multithreading* - Thread class - Runnable interface - synchronized - wait/notify 20. *Static & Final* - static variables/methods - final class/method/variable 21. *Packages & Imports* - package - import 22. *JVM, JRE & JDK* - JVM: runs code - JRE: environment - JDK: tools + JRE 23. *Annotations* - @Override - @Deprecated - @FunctionalInterface 24. *Access Modifiers* - public - private - protected - default (package-private) 25. *Testing Frameworks* - JUnit - TestReact ❤️ for morere** 😊

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Java project ideas to help you practice your skills 1. ToDo List Application: Create a command-line or GUI-based application that allows users to create, manage, and organize their tasks. 2. Calculator: Build a simple calculator application that can perform basic arithmetic operations like addition, subtraction, multiplication, and division. 3. Library Management System: Design a system for managing library resources, including books, patrons, and borrowing records. 4. Chat Application: Develop a chat application that enables users to communicate in real-time, either as a desktop app or through a web interface. 5. Weather App: Create an app that fetches weather data from an API and displays current weather conditions for a given location. 6. Student Gradebook: Build a program to store and calculate student grades. You can add features like grade averages and report generation. 7. Expense Tracker: Create an application for tracking expenses and generating reports, helping users manage their finances. 8. Simple Game (e.g., Tic-Tac-Toe): Implement a classic game like Tic-Tac-Toe to learn about game logic and user interaction. 9. Blog or Content Management System (CMS): Build a simple blog or CMS where users can create, edit, and publish articles. 10. E-commerce Shopping Cart: Create a basic online shopping cart system with product listings, a shopping cart, and checkout functionality. 11. File Manager: Develop a file manager application that allows users to organize and manage files and directories on their computer. 12. Inventory System: Design an inventory management system for tracking products, quantities, and orders for a small business. 13. Music Player: Create a basic music player with features like play, pause, skip, and a library of songs. 14. Password Manager: Build a secure application for storing and managing passwords and other sensitive information. 15. Chess or Sudoku Solver: Implement a chess game or a Sudoku puzzle solver to delve into complex algorithms and logic. 16. Note-taking App: Develop a note-taking application with features like creating, editing, and organizing notes. 17. Expense Sharing App: Build an app for groups to track shared expenses and split bills among friends or roommates. 18. Task Scheduler: Create a program that allows users to schedule and manage tasks, reminders, and appointments. 19. Mini Social Media Platform: Create a simplified social media platform with features like user profiles, posting, and commenting. 20. Quiz or Flashcard Application: Design an app for creating and taking quizzes or using flashcards to study various topics. Choose a project that aligns with your interests and skill level. As you work on these projects, you'll gain valuable experience and improve your Java programming skills.

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Visa interview experience Leetcode easy problems Day 18/100

Day 12/100

Day 10/100

Day 9/100

Day 8/100

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Typical java interview questions sorted by experience Junior * Name some of the characteristics of OO programming languages * What are the access modifiers you know? What does each one do? * What is the difference between overriding and overloading a method in Java? * What’s the difference between an Interface and an abstract class? * Can an Interface extend another Interface? * What does the static word mean in Java? * Can a static method be overridden in Java? * What is Polymorphism? What about Inheritance? * Can a constructor be inherited? * Do objects get passed by reference or value in Java? Elaborate on that. * What’s the difference between using == and .equals on a string? * What is the hashCode() and equals() used for? * What does the interface Serializable do? What about Parcelable in Android? * Why are Array and ArrayList different? When would you use each? * What’s the difference between an Integer and int? * What is a ThreadPool? Is it better than using several “simple” threads? * What the difference between local, instance and class variables? Mid * What is reflection? * What is dependency injection? Can you name a few libraries? (Have you used any?) * What are strong, soft and weak references in Java? * What does the keyword synchronized mean? * Can you have “memory leaks” on Java? * Do you need to set references to null on Java/Android? * What does it means to say that a String is immutable? * What are transient and volatile modifiers? * What is the finalize() method? * How does the try{} finally{} works? * What is the difference between instantiation and initialisation of an object? * When is a static block run? * Why are Generics are used in Java? * Can you mention the design patterns you know? Which of those do you normally use? * Can you mention some types of testing you know? Senior * How does Integer.parseInt() works? * Do you know what is the “double check locking” problem? * Do you know the difference between StringBuffer and StringBuilder? * How is a StringBuilder implemented to avoid the immutable string allocation problem? * What does Class.forName method do? * What is Autoboxing and Unboxing? * What’s the difference between an Enumeration and an Iterator? * What is the difference between fail-fast and fail safe in Java? * What is PermGen in Java? * What is a Java priority queue? * *s performance influenced by using the same number in different types: Int, Double and Float? * What is the Java Heap? * What is daemon thread? * Can a dead thread be restarted? Source: medium.

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