<P> For example, if an organization in Canada called MySoft creates a package to deal with fractions, naming the package ca. mysoft. fractions distinguishes the fractions package from another similar package created by another company . If a German company named MySoft also creates a fractions package, but names it de. mysoft. fractions, then the classes in these two packages are defined in a unique and separate namespace . </P> <P> Complete conventions for disambiguating package names and rules for naming packages when the Internet domain name cannot be directly used as a package name are described in section 7.7 of the Java Language Specification . </P> <Table> <Tr> <Td> java. lang </Td> <Td>--basic language functionality and fundamental types </Td> </Tr> <Tr> <Td> java. util </Td> <Td>--collection data structure classes </Td> </Tr> <Tr> <Td> java.io </Td> <Td>--file operations </Td> </Tr> <Tr> <Td> java. math </Td> <Td>--multiprecision arithmetics </Td> </Tr> <Tr> <Td> java. nio </Td> <Td>--the Non-blocking I / O framework for Java </Td> </Tr> <Tr> <Td> java.net </Td> <Td>--networking operations, sockets, DNS lookups,...</Td> </Tr> <Tr> <Td> java. security </Td> <Td>--key generation, encryption and decryption </Td> </Tr> <Tr> <Td> java. sql </Td> <Td>--Java Database Connectivity (JDBC) to access databases </Td> </Tr> <Tr> <Td> java. awt </Td> <Td>--basic hierarchy of packages for native GUI components </Td> </Tr> <Tr> <Td> java. text </Td> <Td>--Provides classes and interfaces for handling text, dates, numbers, and messages in a manner independent of natural languages . </Td> </Tr> <Tr> <Td> java. rmi </Td> <Td>--Provides the RMI package . </Td> </Tr> <Tr> <Td> java. time </Td> <Td>--The main API for dates, times, instants, and durations . </Td> </Tr> <Tr> <Td> java. beans </Td> <Td>--The java. beans package contains classes and interfaces related to JavaBeans components . </Td> </Tr> </Table> <Tr> <Td> java. lang </Td> <Td>--basic language functionality and fundamental types </Td> </Tr>

All standard classes of java are included within a package called