Java Tutorial

In this tutorial, I will explain you the fundamental knowledge of the Java and object-oriented Java programming language. It was created by Sun Microsystems in 1995 and after that purchased by Oracle Corporation. Java is a platform-independent means, you can run Java Program on any device that has a Java Virtual Machine (JVM).

Key Features of Java

1. Platform Independence: It has principle “Write Once, Run Anywhere” (WORA).

2. Object-Oriented: It has Object oriented concepts like objects and classes.

3. Robust and Secure: Java has many important features like exception handling, memory management (via garbage collection), and security APIs ensure reliable and secure code execution.

4. Multithreaded: It supports multithreading concepts. you can run concurrent programming for tasks like data processing or UI updates.

5. Rich API: It offers vast library of classes and methods for networking, I/O, GUI development, and more.

Components of Java

There are mainly three components of Java

1. Java Development Kit (JDK): It helps developer to write and build Java Programs. It has a compiler (called javac), libraries, and a few command-line tools.

2. Java Runtime Environment (JRE): It provides the setup needed to run Java programs and It includes the JVM and the required libraries.

Note: Once you’ve written your code then JRE takes over.

3. Java Virtual Machine (JVM): This is the engine that runs your Java code. It reads the compiled bytecode and makes sure your program works the same way on any operating system. That’s the reason Java is famous in the world and it has features “write once, run anywhere”.

Why Learn Java?

1. Versatility and Practical: You can use Java to build almost anything — from web apps and enterprise software to Android mobile applications and even IoT-based systems.

2. Huge Community Support: Java has a huge global developer community and you can get details from there.

3. Scalable and Reliable: According your project’s need you can create from a small project to a large enterprise system.

If you’re new to Java, start by learning the basics — things like syntax, variables, loops, and object-oriented programming concepts.

Once you’ve got the fundamentals down, move on to popular frameworks such as Spring, Hibernate, or JavaFX to start building real-world applications.

Java Tutorial – Questions and Answers

Q 1: What is Java?

Ans: Java is a high-level, object-oriented programming language. Java is used to develop secure, scalable, and platform-independent applications.

Q 2: Java is a platform-independent?

Ans: Yes, Java is a platform-independent. Java programs are compiled into bytecode, which runs on any system using the Java Virtual Machine (JVM).

Q 3: Is Java easy to learn?

Ans: Yes, Java easy to learn because java has simple syntax and extensive libraries.

Q 4: What type of applications can be built using Java?

Ans: Java is used for web applications, Android apps, desktop software, and enterprise systems.

Q 5: Is Java free to use?

Ans: Yes, Java is free and open-source under OpenJDK.