Пост ☕ Hi guys!

☕ Hi guys! Thanks for the amazing response on the last post. Let's start our Java Programming Fundamentals series Day 1: Introduction to Java Programming 1. What is Java? Java is a high-level, object-oriented programming language used to develop different types of applications. It was developed by James Gosling and his team at Sun Microsystems and officially released in 1995. Java is widely used for: • Web applications • Android applications • Enterprise software • Banking applications • Desktop applications • Cloud-based applications • Backend development • Big data applications Example: Many enterprise banking systems use Java for backend processing and business logic. 2. Features of Java Let's understand the important features of Java. 1. Platform Independent Java follows the principle of "Write Once, Run Anywhere." You can write Java code on Windows and run the compiled program on Linux or macOS, provided a compatible JVM is available. 2. Object-Oriented Java organizes programs using classes and objects. It supports concepts such as: • Encapsulation • Inheritance • Polymorphism • Abstraction 3. Simple Java has a relatively straightforward syntax, especially for beginners familiar with programming concepts. 4. Secure Java provides security features such as bytecode verification, access controls and runtime checks. 5. Robust Java supports exception handling and automatic memory management, helping developers build reliable applications. 6. Multithreaded Java allows multiple threads to execute concurrently, helping applications perform multiple tasks. 7. Portable Java bytecode can run on different platforms with compatible JVM implementations. 3. JDK, JRE and JVM These are three important terms every Java beginner should understand. JVM (Java Virtual Machine) • Executes Java bytecode. • Converts bytecode into machine instructions during execution. • Manages memory. • Supports garbage collection. JRE (Java Runtime Environment) • Provides the environment required to run Java applications. • Includes the JVM and runtime libraries. JDK (Java Development Kit) • Provides tools required to develop Java applications. • Includes the runtime environment and development tools such as the Java compiler. JDK = Development tools + Runtime JRE = JVM + Runtime libraries JVM = Executes Java bytecode 4. How Java Code Is Executed Let's understand how Java works internally. Step 1: Write Java source code in a file. Example: HelloWorld.java Step 2: Compile the source code using the Java compiler. Step 3: The compiler generates bytecode in a .class file. Step 4: JVM loads and executes the bytecode. Example: public class HelloWorld { public static void main(String[] args) { System.out.println("Hello, World!"); } } Compilation: javac HelloWorld.java Execution: java HelloWorld Output: Hello, World!