Java code comments


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    In Java, comments are annotations in the source code that are ignored by the compiler. They are used to explain and document the code to make it easier to understand for humans. Comments can be beneficial for explaining the purpose of a block of code, the logic behind complex algorithms, or to temporarily disable a portion of code without removing it.

    Java supports three types of comments:

    1. Single-line Comments: Begin with two forward slashes (//). Everything from the // to the end of the line is ignored by the compiler.
    // This is a single-line comment
    int number = 10; // This is another single-line comment
    1. Multi-line Comments: Start with /* and end with */. Everything between these two symbols is considered a comment, including line breaks.
    /* This is a multi-line comment
       and it can span multiple lines. */
    int number = 10;
    1. Documentation Comments (Javadoc Comments): Begin with /** and end with */. These are used to generate HTML documentation for your Java classes and methods. They can include metadata and tags that describe method parameters, return values, exceptions, and more.
     * This is a Javadoc comment
     * @param args The command line arguments
     * @return Nothing
    public static void main(String[] args) {
        System.out.println("Hello, world!");

    Each type of comment serves a different purpose:

    • Single-line comments are useful for brief explanations or notes right next to a line of code.
    • Multi-line comments are best for longer descriptions that may cover several lines, often used at the beginning of a method or a block of code to describe what it does.
    • Javadoc comments are essential for creating documentation that can be generated into an HTML format using the Javadoc tool. They're particularly useful for explaining the purpose of a class or method, the parameters it accepts, the value it returns, and any exceptions it might throw.

    Effective use of comments can make code much easier to understand and maintain, both for the original author and for others who may work on the code later.

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