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Java Syntax – Your First Step into Writing Java Code

Understanding Java syntax is essential for anyone beginning their journey into programming with this powerful language. In this section, we’ll break down a simple Java program and explain each component so you can start writing code confidently.



💻 A Simple Java Program Example

Here’s the first Java program most developers write when starting out:


public class Main {

public static void main(String[] args) {

System.out.println("Hello World");

}

}


This code is stored in a file named Main.java.


🔍 Understanding the Code Structure

Let’s take a closer look at what each part of this program does:


1. Class Declaration


public class Main {


  • Every Java application begins with a class.

  • The class name (in this case, Main) must start with an uppercase letter.

  • The file name should also match the class name (i.e., Main.java).

Java is case-sensitive: MyClass and myclass are not the same.

 2. The main() Method


public static void main(String[] args)


  • This method is the entry point of any Java program.

  • The main() method must always be present and written exactly this way.

  • Java automatically executes the code inside this method when you run your program.


💬 3. Printing Output


System.out.println("Hello World");


  • This line prints text to the screen.

  • System is a built-in class.

  • out is a static object within System.

  • println() is the method used to display messages.

📝 Don’t worry about how System.out.println() works internally—just know it’s essential for output.

🔐 Curly Braces and Semicolons in Java

  • Curly braces {} define the beginning and end of a block of code (like inside classes and methods).

  • Each statement must end with a semicolon (;), which tells Java where an instruction ends.


🧰 Setting Up and Running Java

To run Java programs on your machine:

  • Make sure Java is installed correctly.

  • Save your file as Main.java.

  • Use the command line or an IDE to compile and execute it.


🟢 Expected Output:

Hello World


Summary: Key Rules of Java Syntax

  • All code must reside inside a class.

  • The class name should match the filename.

  • Every Java application requires a main() method.

  • Use System.out.println() for displaying output.

  • Follow syntax rules like semicolons and case sensitivity strictly.


👉 Ready for the next step?


Check out the Java Output and Java Comments guides to learn how to format your program’s results and document your code effectively.





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