Java Comments

Java Comments

In this article, you will learn about Java comments, and why and how to use them. In programming, comments are portion of the program intended for you and your fellow programmers to understand the code.

They are completely ignored by Java compilers. In Java programming language, there are two types of comments:

/* ... */
// ....

Traditional comment /* ... */

This is a multiline comment that can span over multiple lines. The Java compiler ignores everything from /* to */. For example,

/* This is a multi-line comment.
 * The problem prints "Hello, World!" to the standard output.
 */
class HelloWorld {
    public static void main(String[] args) {     
      { 
       System.out.println("Hello, World!");
      }
    }
}

Here, the comment is

/* This is a multi-line comment.
 * The problem prints "Hello, World!" to the standard output.
 */

End of Line Comment //

The compiler ignores everything from // to the end of the line. For example,

// "Hello, World!" program
 
class AssignmentOperator {
    public static void main(String[] args) {     
      { 
       System.out.println("Hello, World!"); // prints "Hello, World!"
      }
    }
}

The program above contains two end of line comments:

// "Hello, World!" program

and

// prints "Hello, World!"