Single-Line Comments

Single-line comments start with // and extend to the end of the line. They are typically used for brief explanations or notes.

// This is a single-line comment
println("Hello, World!") // This prints a message to the console

Multiline Comments

Multiline comments, also known as block comments, begin with /* and end with */. They can span multiple lines and are useful for providing detailed explanations or documentation.

/*
  This is a multiline comment in Groovy.
  It can span multiple lines and is useful
  for documenting complex logic or providing
  detailed explanations.
*/

// Example usage in a function:
def exampleFunction() {
    /* This is a multiline comment
       inside a function. It can explain
       what the function does or document
       important information.
    */
    println("This function does something.")
}

Documentation Comments

Groovy also supports documentation comments, which are a form of multiline comments used to generate documentation. These comments start with /** and end with */. They are processed by tools like GroovyDoc to create API documentation.

/**
 * This is a documentation comment.
 * It is used to describe the purpose and behavior
 * of a class, method, or field in detail.
 *
 * @param name The name of the user
 * @return A greeting message
 */
def greetUser(name) {
    return "Hello, ${name}!"
}

Best Practices

•   Use Comments Sparingly: Write clear and concise code that doesn’t rely heavily on comments for understanding.
•   Keep Comments Updated: Ensure comments are updated along with the code changes to avoid confusion.
•   Document Public APIs: Use documentation comments to describe public methods, classes, and fields, especially in libraries and frameworks.

Rajesh Kumar

I’m a DevOps/SRE/DevSecOps/Cloud Expert passionate about sharing knowledge and experiences. I am working at Cotocus. I blog tech insights at DevOps School, travel stories at Holiday Landmark, stock market tips at Stocks Mantra, health and fitness guidance at My Medic Plus, product reviews at I reviewed , and SEO strategies at Wizbrand. 

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