Java package naming conventions best practices

Maven does not enforce this rule. There are many legacy projects that do not follow this convention and instead use single word group IDs. However, it will be difficult to get a new single word group ID approved for inclusion in the Maven Central repository.

You can create as many subgroups as you want. A good way to determine the granularity of the groupId is to use the project structure. That is, if the current project is a multiple module project, it should append a new identifier to the parent's groupId. For example. Guide to naming conventions on groupId, artifactId, and version groupId uniquely identifies your project across all projects. A group ID should follow Java's package name rules. This means it starts with a reversed domain name you control.

For example, org. If you created it, then you can choose whatever name you want with lowercase letters and no strange symbols. If it's a third party jar, you have to take the name of the jar as it's distributed. If it's a third party artifact, you have to use their version number whatever it is, and as strange as it can look. For example, 2.Comment 2. The article presents a compiled list of unit tests naming strategy that one could follow for naming their unit tests. The article is intended to be a quick reference instead of going through multiple great pages such as following.

That said, to know greater details, please feel free access one of these pages listed below and know for yourself.

Following are 7 popular unit tests naming conventions that are found to be used by majority of developers and compiled from above pages:. My personal favorite is naming unit tests based on the writing features of the class under test. It helps me to make sure that a class follows single responsibility.

It also aids a great deal in code refactoring.

java package naming conventions best practices

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Join For Free. This technique also has disadvantage that if method names get changed, it becomes difficult to comprehend at a later stage. However, some sections of developer love to use this technique. It is also recommended for the reason that it makes unit tests as alternate form of documentation and avoid code smells. The idea is to break down the tests into three part such that one could come up with preconditions, state under test and expected behavior to be written in above format.

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Learn from thousand of experts, get answers to your questions and share knowledge with peers. It has been noticed that certain packages and Java classes are created in packages such as xxcat. Note: For customers, see Extending OA Framework Applications for recommended package structure and naming conventions for custom logic.

The Oracle corporate standard on package names requires that they begin with a lower case letter and use initial capitals rather than underscores for each subsequent word in the name for example: oracle. At the highest level, all Oracle E-Business Suite code goes into the oracle. You should NOT create your code under the following restricted packages: y oracle. Naming standards for the OA Components Package are provided below. Another aspect I would like to know is how and what is the coherent for specifying xxcat.

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Please type your message and try again. This discussion is archived. Would like to have insight or documentation pertains to this. This content has been marked as final. Show 2 replies.

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Please refer the topic in OAF dev guide. Thanks for the insight. Go to original post.Every programmer agrees naming classes is highly important for code readability. Proper naming decrease the time needed to understand the code base. There are numerous queries around the best practices which come not only from the beginners. The aim of this article is to put in one place answers for the most popular questions around Java class name conventions and community standards.

When it comes to technical limitations for class names, the Java language is pretty flexible. But realistically, programmers rarely use this flexibility. The specification of the programming language states that the length of a Java class name is unlimited. In practice, however, the first limit comes from the JVM specification. Moreover, the class name is usually the same as the filename in which you define the type.

Because of that, there is one more factor affecting the max length of the class name. In Windows, the limit for a single filename is characters. For UNIX based system most file systems also restrict the length of a file to characters. The language specification states that a class name should be a sequence of so-called Java letters or Java digits.

The first character should be a Java letter. A Java digit is a collection of numbers from 0 to 9. The idea behind the Unicode characters as a valid part of Java class names is to allow programming in the native language of developers all over the world. Usually, programmers limit themselves to the English alphabet. Especially some plural variable names generated by IDE. Java is already a pretty old programming language. Over the years, developers created several commonly agreed standards for naming classes.Jesper's Blog - Pluralsight Author Page.

SCJP 1. Campbell Ritchie wrote: Jilesh Lakhani wrote:. Rusty Shackleford wrote: As long as your names are meaningful and are consistent with your convention, it doesn't really matter what convention you use. There are only two hard things in computer science: cache invalidation, naming things, and off-by-one errors.

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Forum: Beginning Java. Jesper de Jong.

java package naming conventions best practices

Java Cowboy. I like Have a look at Code Conventions for the Java Programming Language - this seems to be the de facto coding standard for Java, almost all projects that I've worked on use the conventions from that document.

Rob Spoor. Jacob, please Show Some Effort. Campbell Ritchie. The names of identifiers should make their meanings obvious.

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Find the conventions for JavaBeans about get and set methods. Methods with a boolean return type usually start with "is" or "has". Methods which return an instance are usually called getInstance. Muhammad Khojaye. Jilesh Lakhani. Best of Luck. Victor Ewert. You'll be glad you did later on when looking back at you code, trying to debug some issue Victor Ewert Ewert Technologies. Jilesh Lakhani wrote:. That only applies to public static final fields.In package-by-feature, the package names correspond to important, high-level aspects of the problem domain.

For example, a drug prescription application might have these packages:. It's important to note that a package can contain not just Java code, but other files as well. Indeed, in order for package-by-feature to really work as desired, all items related to a given feature - from user interface, to Java code, to database items - must be placed in a single directory dedicated to that feature and only that feature.

If that's the case, it may be removed simply by deleting the directory. If it is indeed used by some other feature, then its removal will not be as simple as a single delete operation. That is, the package-by-feature idea does not imply that one package can never use items belonging to other packages.

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Rather, package-by-feature aggressively prefers package-private as the default scopeand only increases the scope of an item to public only when needed. Higher Modularity As mentioned above, only package-by-feature has packages with high cohesion, high modularity, and low coupling between packages.

Easier Code Navigation Maintenance programmers need to do a lot less searching for items, since all items needed for a given task are usually in the same directory.

Best Practices for Variable and Method Naming

Some tools that encourage package-by-layer use package naming conventions to ease the problem of tedious code navigation. However, package-by-feature transcends the need for such conventions in the first placeby greatly reducing the need to navigate between directories. Higher Level of Abstraction Staying at a high level of abstraction is one of programming's guiding principles of lasting value. It makes it easier to think about a problem, and emphasizes fundamental services over implementation details.

As a direct benefit of being at a high level of abstraction, the application becomes more self-documenting: the overall size of the application is communicated by the number of packages, and the basic features are communicated by the package names. The fundamental flaw with package-by- layer style, on the other hand, is that it puts implementation details ahead of high level abstractions - which is backwards. Separates Both Features and Layers The package-by-feature style still honors the idea of separating layers, but that separation is implemented using separate classes.

The package-by- layer style, on the other hand, implements that separation using both separate classes and separate packages, which doesn't seem necessary or desirable. Minimizes Scope Minimizing scope is another guiding principle of lasting value.

Here, package-by-feature allows some classes to decrease their scope from public to package-private. This is a significant change, and will help to minimize ripple effects.

The package-by-layer style, on the other hand, effectively abandons package-private scope, and forces you to implement nearly all items as public. This is a fundamental flaw, since it doesn't allow you to minimize ripple effects by keeping secrets. Better Growth Style In the package-by-feature style, the number of classes within each package remains limited to the items related to a specific feature.

If a package becomes too large, it may be refactored in a natural way into two or more packages. The package-by- layer style, on the other hand, is monolithic.

As an application grows in size, the number of packages remains roughly the same, while the number of classes in each package will increase without bound.

The first few strokes, which create the form, carry within them the destiny of the rest. Christopher Alexander is an architect. Without having worked as programmer, he has influenced many people who think a lot about programming. He has thought long and hard about how to build beautiful things, and these reflections seem to largely apply to software construction as well.

In a CBC radio interview, Alexander recounted the following story paraphrased here : "I was working with one of my students. He was having a very difficult time building something. He just didn't know how to proceed at all. So I sat with him, and I said this: Listen, start out by figuring out what the most important thing is. Get that straight first. Get that straight in your mind. Take your time. Don't be too hasty.According to standard Java naming conventions, you make your code easier to read for yourself and for other programmers.

java package naming conventions best practices

There are following points should be follow by each developers. Popular Tutorials. There are following points of best practices in programming to decide name of Variables, Methods, Classes and Packages. Meaningless Names of Variables should be avoid like name as xyz, a, aa, bbb, i, iii, temp etc. You should never use pointless or meaningless name even you are making Hello Java project because it makes your habit.

In a real project it would never acceptable by code reviewer because hello world programs are not maintained but a real project is maintained for years. This point is counterpart of first point. According to best practice of naming conventions inn java you should always use meaningful name instead of pointless names.

For example variable name index is much better than like i,ii,j etc and method name with getJoinDate is also much better than getJDjDatejdt because method name getJoinDate understandable name in future for any other developers in somewhere in my code. Shorter name is always preferable over longer name if it reveal intent clearly. This point is counterpart of above point. In programming intent revealing is also important point to decide name of variables, methods etc.

So prefer shorter name if and only if it reveal intent completely, otherwise choose longer and descriptive name. Never use similar names like employee and employees, both variable have every same character except last one.

This kind of variable names might be reason of very hard to spot and subtle bugs and also these names are even harder to find during code reviews. For single employee use employee or emp and for list employees always use like listOfEmp or listOfEmployees over employees. According to best practice of programming, you should always use consistent naming convention in a project. Suppose for a project you are using closefinishkill etc.

This will make your API more usable, as programmer will be able to predict and search more easily. Class name should be noun, Interface name should describe ability and method names should start with verb. For example class names should be Employee, Student, Manager, Method names should start with verb e.

And package name should follow standard company structure e.


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