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A comment is an explanatory note or description added directly into the source code by a programmer.
When you write code, comments serve as clear documentation. They help other developers understand what your program is doing without having to decipher every single line of logic. Crucially, any words or symbols placed inside comment sections are completely ignored by the Java compiler during compilation.
The Three Types of Java Comments
Java supports three distinct styles of comments to suit different documentation needs:
1. Single-Line Comments
Single-line comments start with two forward slashes (//). Everything from the slashes to the end of that specific line is treated as a comment.
// This is a single-line comment
System.out.println("Hello, Ram!");2. Multi-Line Comments
When you need to write longer explanations spanning several lines, use multi-line comments. They begin with /* and terminate with */.
/*
* This is a multi-line comment.
* It is great for longer descriptions
* and documenting complex logic blocks.
*/3. Documentation Comments (Javadoc)
Documentation comments start with /** and end with */. These are specialized comments used by the javadoc tool to automatically generate standard HTML documentation for your classes, methods, and packages.
/**
* This class demonstrates the use of comments in Java.
* @author John
*/Why Are Comments Important?
- Code Readability: Makes code easier to maintain and update over time.
- Team Collaboration: Allows teammates to pick up where you left off smoothly.
- Debugging: Allows you to temporarily disable code lines during testing without deleting them.
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