How to write a quality comment

In order to write a good article, first choose your topic and decide its boundaries. The topic must be narrowed as much as possible, and the scope of it must be outlined clearly.

How to write a quality comment

Custom Tags and Annotations If annotations are new to you, when you need to markup your source code, it might not be immediately clear whether to use an annotation or a Javadoc custom tag.

Here is a quick comparison of the two. In general, if the markup is intended to affect or produce documentation, it should probably be a javadoc tag; otherwise, it should be an annotation. Tag - Intended as a way of adding structure and content to the documentation.

Allows multi-line text to be provided. Use the -tag or -taglet Javadoc option to create custom tags. Tags should never affect program semantics. Annotation - Does not directly affect program semantics, but does affect the way programs are treated by tools and libraries, which can in turn affect the semantics of the running program.

Annotations can be read from source files, class files, or reflectively at run time. Allows a single line of text to be provided. If you need to affect both program semantics and documentation, you probably need both an annotation and a tag.

For example, our guidelines now recommend using the Deprecated annotation for alerting the compiler warning and the deprecated tag for the comment text. Documenting Default Constructors Section 8.

If a class contains no constructor declarations, then a default constructor that takes no parameters is automatically provided. It invokes the superclass constructor with no arguments.

The constructor has the same access as its class. The Javadoc tool generates documentation for default constructors.


When it documents such a constructor, Javadoc leaves its description blank, because a default constructor can have no doc comment.

The question then arises: How do you add a doc comment for a default constructor? The simple answer is that it is not possible -- and, conveniently, our programming convention is to avoid default constructors.

We considered but rejected the idea that the Javadoc tool should generate a default comment for default constructors. Good programming practice dictates that code should never make use of default constructors in public APIs: All constructors should be explicit.

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That is, all default constructors in public and protected classes should be turned into explicit constructor declarations with the appropriate access modifier.

This explicit declaration also gives you a place to write documentation comments. We have had several cases where we did not want a public class to be instantiable, but the programmer overlooked the fact that its default constructor was public. If a class is inadvertently allowed to be instantiable in a released version of a product, upward compatibility dictates that the unintentional constructor be retained in future versions.

Under these unfortunate circumstances, the constructor should be made explicit and deprecated using deprecated. Note that when creating an explicit constructor, it must match precisely the declaration of the automatically generated constructor; even if the constructor should logically be protected, it must be made public to match the declaration of the automatically generated constructor, for compatibility.

An appropriate doc comment should then be provided. Often, the comment should be something as simple as: Javadoc-generated API documentation contains two ways of specifying this contract for exceptions -- the "throws" clause in the declaration, and the throws Javadoc tag.

These guidelines describe how to document exceptions with the throws tag.The Jargon File contains a bunch of definitions of the term ‘hacker’, most having to do with technical adeptness and a delight in solving problems and overcoming limits.

How to Comment on a Work Review | Career Trend

If you want to know how to become a hacker, though, only two are really relevant. There is a community, a shared culture, of expert programmers and networking wizards that traces its history back through decades to the.

Allow your readers to comment on your posts. Don’t be afraid to write about everyday activities — parking tickets and car repairs — but don’t neglect to talk about what you’re thinking and feeling.

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how to write a quality comment

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Thanks once again to Linda Yollis for her magnificent work on class blogging – thanks to these delightful students, for the effective and practical tips about the importance of leaving authentic comments. Latest opinion, analysis and discussion from the Guardian.

CP Scott: "Comment is free, but facts are sacred".

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