Java Syntax

Java syntax refers to the set of rules that define how Java programs are written and structured. Understanding syntax is important because even a small mistake can cause errors in your program.

Basic Structure of Java Program

Every Java program follows a specific structure that includes a class and a main method.

Example

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

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Example Explained

public class Main → Defines a class named Main
public static void main(String[] args) → The main method where the program starts
System.out.println() → Prints output to the console

Java is Case-Sensitive

Java is a case-sensitive language, which means that uppercase and lowercase letters are treated differently.

Example

public class Main {
  public static void main(String[] args) {
   System.out.println("Hello");  // Correct
   system.out.println("Hello");  // Error
  }
}

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Java Statements

Each statement in Java must end with a semicolon (;).

Example

public class Main {
  public static void main(String[] args) {
   int x = 5;
   System.out.println(x);
  }
}

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Code Blocks

Java uses curly braces { } to group multiple statements into a block.

Example

if (true) {
  System.out.println("This is a block");
}

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Java Comments

Comments are used to explain code and are ignored by the compiler.

Example

// This is a single-line comment

/*
This is a
multi-line comment
*/

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Why Java Syntax is Important

It helps write correct programs
It reduces errors
It improves code readability
It is essential for understanding advanced topics