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java.awt: Basic hierarchy of packages for native GUI components java.text: Provides classes and interfaces for handling text, dates, numbers, and messages in a manner independent of natural languages. java.rmi: Provides the RMI package. java.time: The main API for dates, times, instants, and durations. java.beans
Static import is a feature introduced in the Java programming language that allows members (fields and methods) which have been scoped within their container class as public static, to be used in Java code without specifying the class in which the field has been defined.
Another purpose of packages is to govern code access together with access modifiers. For example, java.io.InputStream is a fully qualified class name for the class InputStream which is located in the package java.io. A package is declared at the start of the file with the package declaration:
Using metadata in the JAR manifest, JAR files (called bundles) are wired on a per-package basis. Bundles can export packages, import packages and keep packages private, providing the basic constructs of modularity and versioned dependency management. Java 9 introduced the Java Platform Module System in 2017. This specifies a distribution format ...
The meaning of the contents in the example is as follows: [7] Bundle-Name: Defines a human-readable name for this bundle, Simply assigns a short name to the bundle. Bundle-SymbolicName: The only required header, this entry specifies a unique identifier for a bundle, based on the reverse domain name convention (used also by the java packages).
The JNA library uses a small native library called foreign function interface library to dynamically invoke native code.The JNA library uses native functions allowing code to load a library by name and retrieve a pointer to a function within that library, and uses libffi library to invoke it, all without static bindings, header files, or any compile phase.
Code from other packages is accessed by prefixing the package name before the appropriate identifier, for example class String in package java.lang can be referred to as java.lang.String (this is known as the fully qualified class name). Like C++, Java offers a construct that makes it unnecessary to type the package name (import).
In addition to the standard UML Dependency relationship, there are two special types of dependencies defined between packages: . package import; package merge; A package import is "a directed relationship between an importing namespace and a package, indicating that the importing namespace adds the names of the members of the package to its own namespace."