Introduction

Comments are an essential part of programming. In Java, comments are used to explain the code, make it readable, and temporarily disable parts of the code during testing. They are ignored by the compiler and do not affect the program’s execution. Java supports single-line and multi-line comments.

1. Single-line Comments

Definition:
Single-line comments are used to comment a single line of code. They start with //.

Example Code:

public class SingleLineComment {
public static void main(String[] args) {
// This is a single-line comment
System.out.println("Hello, World!");
// The line below prints a message
System.out.println("Java Comments Example");
}
}

Explanation:

• Anything after // on the same line is treated as a comment.
• Single-line comments are useful for brief explanations of code logic or notes.

2. Multi-line Comments

Definition:
Multi-line comments are used to comment multiple lines of code. They start with /* and end with */.

Example Code:

public class MultiLineComment {
public static void main(String[] args) {
/* This is a multi-line comment
It can span multiple lines
Useful for detailed explanations */
System.out.println("Hello, World!");
}
}

Explanation:

• Everything between /* and */ is ignored by the compiler.
• Multi-line comments are ideal for explaining complex logic, documenting methods, or temporarily disabling blocks of code.

Summary Table

Conclusion

Comments improve code readability and maintainability.

• Single-line comments (//) are perfect for short notes.
• Multi-line comments (/* */) are suitable for longer explanations.

Using comments wisely makes your code easier to understand and maintain for yourself and others.