Introduction to Java
Start your Java journey here! Learn what Java is, its history, features, and why it's the backbone of enterprise software.
Start your Java journey here! Learn what Java is, its history, features, and why it's the backbone of enterprise software. This hands-on tutorial focuses on practical implementation of introduction to java concepts.
Introduction to Java
Welcome to the world of Java! One of the most robust, secure, and widely used programming languages in the world. From Android apps to massive enterprise systems, Java is everywhere.
What is Java?
Java is a high-level, class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible. It was originally developed by James Gosling at Sun Microsystems (now owned by Oracle) and released in 1995.
The "Write Once, Run Anywhere" (WORA) Philosophy
Java's most famous feature is WORA. This means that compiled Java code can run on all platforms that support Java without the need for recompilation.
Java Version History
Java has evolved significantly since 1995. Here are the key milestones:
| Version | Year | Key Features |
|---|---|---|
| Java 1.0 | 1995 | First release, "Oak" -> "Java" |
| Java 5 | 2004 | Generics, Annotations, Enum, Enhanced For-loop |
| Java 8 | 2014 | LTS. Lambdas, Streams API, Date & Time API |
| Java 11 | 2018 | LTS. Local-Variable Syntax (var), HTTP Client |
| Java 17 | 2021 | LTS. Records, Sealed Classes, Pattern Matching |
| Java 21 | 2023 | LTS. Virtual Threads, Sequenced Collections |
[!NOTE] LTS (Long Term Support) versions are supported for years. Most enterprises use Java 8, 11, 17, or 21.
Key Features of Java
- Object-Oriented: Everything in Java is an object (well, almost everything!).
- Platform Independent: Thanks to the JVM (Java Virtual Machine).
- Simple: It removed complex features of C++ like pointers and multiple inheritance.
- Secure: Built-in security features make it a top choice for banking and enterprise apps.
- Multithreaded: Java supports multithreading out of the box, allowing for concurrent execution.
- Robust: Strong memory management and exception handling.
Where is Java Used?
Java vs Other Languages
| Feature | Java | Python | C++ |
|---|---|---|---|
| Type System | Statically Typed | Dynamically Typed | Statically Typed |
| Performance | Fast (JIT Compiler) | Slower (Interpreted) | Very Fast |
| Memory Management | Automatic (Garbage Collection) | Automatic (Garbage Collection) | Manual |
| Use Cases | Enterprise, Android, Backend | AI, Data Science, Scripts | Systems, Games |
Your First Taste of Java
Here is a simple Java program. Don't worry if you don't understand everything yet!
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Question 1 of 5Who developed Java?
Next Steps
Now that you know what Java is, let's understand how it works under the hood in the next lesson!