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🔤 Java Syntax – Writing Your First Real Code

Welcome to one of the most exciting parts of your Java journey — understanding the syntax! At GoNimbus, we believe learning Java should be both logical and enjoyable. Let’s break down the essential rules that make your Java programs run smoothly.

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📂 Java File Structure

Every Java program begins with a class. Let’s take another look at a simple example:

public class Main {
  public static void main(String[] args) {
    System.out.println("Hello, Java from GoNimbus!");
  }
}

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🔍 Dissecting the Code

Element	What It Means
public class Main	Declares a class named Main. Class names in Java must start with a capital letter and match the filename (i.e., Main.java).
{ }	Curly braces define the scope of your class or method.
public static void main(String[] args)	This is the main method — the entry point where Java starts executing your program.
System.out.println(...)	A command that prints output to the screen.

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🧠 Important Java Rules

• Case Sensitivity: Java is case-sensitive. Main, main, and MAIN are treated as different identifiers.
• Filename = Class Name: The filename must exactly match the public class name. Example: MyApp.java must contain public class MyApp.
• Every Statement Ends with ; (semicolon): Forgetting this causes compilation errors.

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🛠 The main() Method – Your Program’s Launch Pad

public static void main(String[] args) {
  // your code goes here
}

You’ll see this method in every Java application. While it may look confusing now, here’s a simplified breakdown:

Keyword	Meaning
public	Makes this method accessible to the Java runtime.
static	Allows this method to run without creating an object.
void	Means the method doesn’t return any value.
String[] args	Accepts command-line arguments (you’ll learn about this later).

📌 Tip: You don’t need to memorize it all right now — just know that your program must have this method to run.

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📤 Print Output with System.out.println()

System.out.println("Java is awesome!");

• System – A built-in class in the java.lang package.
• out – A static object (an instance of PrintStream) inside the System class.
• println() – A method that prints a line of text and moves to the next line.

💬 Want to print without a new line? Use System.out.print() instead.

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🧩 Syntax Summary

Concept	Example
Class Declaration	public class HelloWorld { }
Main Method	public static void main(String[] args) { }
Output	System.out.println("Hello Java!");
Block of Code	Enclosed between { }
Statement End	Each line ends with ;

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🌟 GoNimbus Bonus Tips

✅ Use indentation to improve code readability
✅ Start class names with uppercase (e.g., Student, Employee)
✅ Use meaningful names — avoid names like abc, xyz
✅ Write comments to explain your code logic

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📘 Up Next: Java Variables and Data Types

Now that you understand how Java syntax works, it’s time to explore how to store and manipulate data using variables and data types.

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