Java · Chapter 6 of 42
Java Comments
Comments are notes ignored by the compiler, used to explain code. Java supports single-line comments with //, multi-line comments with /* */, and special Javadoc comments with /** */ used to generate documentation.
Syntax
// single line
/* multi
line */
/** javadoc */Single and multi-line comments
// comments out the rest of a line. /* ... */ can span multiple lines and is often used for longer explanations.
Javadoc comments
/** ... */ comments placed above classes or methods can be processed by the javadoc tool to auto-generate HTML documentation.
Example 1 (java)
public class Main {
// prints a greeting
public static void main(String[] args) {
System.out.println("Hi!"); /* inline comment */
}
}Output
Hi!Comments are ignored during compilation and do not affect output.
Key points
- // starts a single-line comment.
- /* */ wraps a multi-line comment.
- /** */ is used for Javadoc documentation.
- Comments do not affect program execution.
💡 Note: Use Javadoc comments on public classes and methods in real projects for maintainability.