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A Java package organizes Java classes into namespaces, [1] providing a unique namespace for each type it contains. Classes in the same package can access each other's package-private and protected members. In general, a package can contain the following kinds of types: classes, interfaces, enumerations, records and annotation types. A package ...
The official core Java API, contained in the Android (Google), SE (OpenJDK and Oracle), MicroEJ. These packages (java.* packages) are the core Java language packages, meaning that programmers using the Java language had to use them in order to make any worthwhile use of the Java language. Optional APIs that can be downloaded separately.
Packages are a part of a class name and they are used to group and/or distinguish named entities from other ones. 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.
This package contains standard java types like Integers and Strings as well as basic exceptions, math functions, system functions, threading and security functions. java.util A streamlined version of the java.util collection library. This package contains the collection classes like Vector and Hashtable. It also contains calendar and date class.
This package was added in J2SE 1.2. Java has an expressive system of references and allows for special behavior for garbage collection. A normal reference in Java is known as a "strong reference". The java.lang.ref package defines three other types of references—soft, weak, and phantom references. Each type of reference is designed for a ...
java is the Java runtime launcher, a type of SDK Tool (A command-line tool, such as javac, javadoc, or apt)-classpath D:\myprogram sets the path to the packages used in the program (on Linux, -cp /home/user/myprogram) and; org.mypackage.HelloWorld is the name of the main class
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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).