Here is what the previous example would look like after running the javadoc tool: getImage public Image getImage( url url, String name) Returns an Image object that can then be painted on the screen. The url argument must specify an absolute url. The name argument is a specifier that is relative to the url argument. This method always returns immediately, whether or not the image exists. When this applet attempts to draw the image on the screen, the data will be loaded. The graphics primitives that draw the image will incrementally paint on the screen.
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Write the first sentence as a short summary of the method, as javadoc automatically places it in the method summary table (and index). Notice the inline tag @link url, which converts to an html hyperlink pointing to the documentation for the url class. This inline tag can be used anywhere that a comment can be written, such as in the text following block tags. If you have more than one paragraph in the doc comment, separate the paragraphs with a p paragraph tag, as shown. Insert a blank comment line between the description and the list of tags, as shown. The first line that begins with an character ends the description. There is for only one description block per doc comment; you cannot continue the description following block tags. The last line contains the end-comment delimiter ( note that unlike the begin-comment delimiter, the end-comment contains only a single asterisk. For more examples, see simple Examples. So lines won't wrap, limit any doc-comment lines to 80 characters.
The url argument must specify an absolute @link url. The name * argument is a specifier that is relative to the url argument. p * This method always returns immediately, whether or not the * image exists. When this applet attempts to draw the image on * the screen, the data will be loaded. The graphics primitives * that draw the image will incrementally paint on the screen. @param url an absolute url giving the base location of the image * @param name the location of the image, relative to the url argument * @return the image at the specified url * @see image public Image getImage(url url, String name) try. The first line contains the begin-comment delimiter (. Starting with javadoc.4, the leading asterisks are optional.
These comments are processed by the javadoc tool to generate the api docs. Javadoc The jdk tool that generates api documentation from documentation comments. Source files The javadoc tool can generate output originating from four different types of "source" files: source code files for java classes (.java) - these contain class, interface, field, constructor and method comments. Package comment files - these contain package comments overview comment files - these contain comments about the set of packages Miscellaneous unprocessed files - these include images, sample source code, class files, applets, html files, and whatever else you might want to reference from the. For more details, see: source files. Writing Doc Comments Format of a pdf doc Comment A doc comment is written in html and must precede a class, field, constructor or method declaration. It is made up of two parts - a description followed by block tags. In this example, the block tags are @param, @return, and @see. Returns an Image object that can then be painted on the screen.
When a complex system such as java (which contains about 60 packages) is being developed, often a group of engineers contributing to a particular set of packages, such as javax. Swing may develop guidelines that are different from other groups. This may be due to the differing requirements of those packages, or because of resource constraints. Terminology, api documentation (api docs) or, api specifications (api specs) On-line or hardcopy descriptions of the api, intended primarily for programmers writing in java. These can be generated using the javadoc tool or created some other way. An api specification is a particular kind of api document, as described above. An example of an api specification is the on-line java platform, Standard Edition 7 api specification. Documentation comments (doc comments) The special comments in the java source code that are delimited by the.
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The purpose of an api writer is to relieve the designer from some of this work. In this case, the api designer would write the initial doc comments using sparse language, and then the writer would review the comments, refine the content, and add tags. If the doc comments are an api specification for re-implementors, and not simply a guide for developers, they should be written either by the programmer who designed and implemented the api, or by a api writer who is or has become a subject matter expert. If the implementation is written to spec but the doc comments are unfinished, a writer can complete the doc comments by inspecting the source code or writing report programs that test the api. A writer might inspect or test for exceptions thrown, parameter boundary conditions, and for acceptance of null arguments.
However, a much more difficult situation arises if the implementation is not written to spec. Then a writer can proceed to write an api specification only if they either know the intent of the designer (either through design meetings or through a separately-written design specification) or have ready access to the designer with their questions. Thus, it may be more difficult for a writer to write the documentation for interfaces and abstract classes that have no implementors. With that in mind, these guidelines are intended to describe the finished documentation comments. They are intended as suggestions rather than requirements to be slavishly followed if they seem overly burdensome, or if creative alternatives can be found.
If a decision is made to correct the api specification, it would be useful to state that either in the api specification itself, or in a list of changes to the spec, or both. Documenting an api difference like this in a doc comment, along with its workaround, alerts a developer to the change where they are most likely to see. Note that an api specification with this correction would still maintain its implementation-independence. Code bugs are bugs in the implementation rather than in the api specification. Code bugs and their workarounds are often likewise distributed separately in a bug report.
However, if the javadoc tool is being used to generate documentation for a particular implementation, it would be quite useful to include this information in the doc comments, suitably separated as a note or by a custom tag (say @bug). Who Owns and Edits the doc Comments. The doc comments for the java platform api specification is owned programmers. However, they are edited by both programmers and writers. It is a basic premise that writers and programmers honor each other's capabilities and both contribute to the best doc comments possible. Often it is a matter of negotiation to determine who writes which parts of the documentation, based on knowledge, time, resources, interest, api complexity, and on the state of the implementation itself. But the final comments must be approved by the responsible engineer. Ideally, the person designing the api would write the api specification in skeleton source files, with only declarations and doc comments, filling in the implementation only to satisfy the written api contract.
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You can include any or all of this information in documentation comments (and can include custom tags, handled by a custom doclet, to facilitate it). At java software, we consciously do not include this level of documentation in doc comments, and instead include either links to this information (links to the java tutorial and list of changes) or include this information in the same documentation download bundle as the api. It's useful to go into further detail about how to document bugs and workarounds. There is sometimes a discrepancy between how code should work and how it actually works. This can take two different forms: api spec with bugs and code bugs. It's useful to decide up front whether you want to document these in the doc comments. At java software we have decided to document both of these outside of doc comments, though we do make exceptions. Api spec bugs are bugs that are present in the method declaration or in the doc comment that affects the syntax or semantics. An example of such a spec bug is a method that is specified to throw a nullPointerException when null is passed in, but null is actually a useful parameter that should be accepted (and was even implemented that way).
We have guidelines for how to prominently document implementation differences. The java api specification should contain assertions sufficient to enable software quality Assurance to write complete java compatibility kit (JCK) tests. This means that the doc comments must satisfy the needs of the conformance testing by sqa. The comments should not document bugs or how an implementation that is currently out of spec happens to work. Writing Programming guide documentation, what advertisements separates api specifications from a programming guide are examples, definitions of common programming terms, certain conceptual overviews (such as metaphors and descriptions of implementation bugs and workarounds. There is no dispute that these contribute to a developer's understanding and help a developer write reliable applications more quickly. However, because these do not contain api "assertions they are not necessary in an api specification.
behavior of each method on which a caller can rely. It does not describe implementation details, such as whether the method is native or synchronized. The specification should describe (textually) the thread-safety guarantees provided by a given object. In the absence of explicit indication to the contrary, all objects are assumed to be "thread-safe" (i.e., it is permissible for multiple threads to access them concurrently). It is recognized that current specifications don't always live up to this ideal. Unless otherwise noted, the java api specification assertions need to be implementation-independent. Exceptions must be set apart and prominently marked as such.
A staff with generous resources can afford to blend both into the shredder same documentation (properly "chunked however, our priorities dictate that we give prime focus to writing api specifications in doc comments. This is why developers often need to turn to other documents, such. Java se technical Documentation and, the java tutorials for programming guides. Writing api specifications, ideally, the java api specification comprises all assertions required to do a clean-room implementation of the java platform for "write once, run anywhere" - such that any java applet or application will run the same on any implementation. This may include assertions in the doc comments plus those in any architectural and functional specifications (usually written in Framemaker) or in any other document. This definition is a lofty goal and there is some practical limitation to how fully we can specify the api. The following are guiding principles we try to follow: The java platform api specification is defined by the documentation comments in the source code and any documents marked as specifications reachable from those comments. Notice that the specification does not need to be entirely contained in doc comments.
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Javadoc Home page, this document describes the style guide, tag and image conventions we use in documentation comments for java programs paper written at java software, oracle. It does not rehash related material covered elsewhere: Contents, introduction, writing Doc Comments, introduction. Principles, at java software, we have several guidelines that might make our documentation comments different than those of third party developers. Our documentation comments define the official. Java platform api specification. To this end, our target audience is those who write java compatibility tests, or conform or re-implement the java platform, in addition to developers. We spend time and effort focused on specifying boundary conditions, argument ranges and corner cases rather than defining common programming terms, writing conceptual overviews, and including examples for developers. Thus, there are commonly two different ways to write doc comments - as api specifications, or as programming guide documentation. These two targets are described in the following sections.