Bluej example projects4/11/2024 In this event, the suggested convention is to add an underscore. This can occur if the domain name contains a hyphen or other special character, if the package name begins with a digit or other character that is illegal to use as the beginning of a Java name, or if the package name contains a reserved Java keyword, such as "int". In some cases, the internet domain name may not be a valid package name. Packages in the Java language itself begin with java. Ihr frisch installierter BlueJ-Ordner enthält einen Unterordner 'examples'. Name collisions that occur within a single company need to be handled by convention within that company, perhaps by including the region or the project name after the company name (for example, ). Package names are written in all lower case to avoid conflict with the names of classes or interfaces.Ĭompanies use their reversed Internet domain name to begin their package namesfor example, for a package named mypackage created by a programmer at. This works well unless two independent programmers use the same name for their packages. That is, the fully qualified name of the Rectangle class in the graphics package is graphics.Rectangle, and the fully qualified name of the Rectangle class in the java.awt package is. The fully qualified name of each Rectangle class includes the package name. Still, the compiler allows both classes to have the same name if they are in different packages. In fact, the previous example does just that: It defines a Rectangle class when there is already a Rectangle class in the java.awt package. ![]() With programmers worldwide writing classes and interfaces using the Java programming language, it is likely that many programmers will use the same name for different types.
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