Java Comments

Comments in Java are used to provide explanations or annotations for the code, helping developers understand its purpose and functionality.

They do not affect the execution of the code and are ignored by the compiler.

Java supports single-line and multi-line comments.

Single-Line Comments

Single-line comments start with two slashes // and continue until the end of the line.

They can be used to add brief explanations to code snippets.

Here’s an example:

// This is a single-line comment

Multi-Line Comments

Multi-line comments start with /* and end with */.

They can span multiple lines and are useful for explaining large blocks of code or providing more detailed explanations.

Here’s an example:

This is a multi-line comment
It can span multiple lines

Documentation Comments

Java also supports a special type of comment, known as documentation comments.

These comments are used to generate API documentation for Java classes and methods.

They start with /** and end with */.

Here’s an example:

* This is a documentation comment
* It is used to generate API documentation

Tips and Tricks

  • Use meaningful and descriptive comments to help others understand the purpose of your code.
  • Avoid commenting out code unless necessary, as it makes the code more difficult to read and maintain.
  • Place comments at appropriate places in the code, not in the middle of a line of code.
  • Use multi-line comments for large explanations, and single-line comments for brief explanations.
  • Update comments regularly to reflect changes in the code.


Comments are an important tool in writing clean and maintainable code.

They help others understand the purpose and functionality of your code, and provide additional information for future development.

By using the different types of comments in Java, you can create well-documented code that is easy to understand and maintain.

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