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Java API provides a number of classes grouped into different packages according to their functionality.
These packages consist of a large number of classes which are a part of java API.
Following are some mostly used java packages which are located in java
| Package Name | Description / USE |
|---|---|
| java.lang |
This package contains language support classes. This package is automatically imported by java compiler for itself use. Classes : Integer,String,Math,Exception etc Interfaces : Runnable,Comparable,Readable etc |
| java.util | These are the language utility classes. Classes : Scanner,Vector,Array,Date,Random,Timer,LinkedList etc Interfaces : Collection, Deque, Iterator, Set etc |
| java.io | These are the input/output support classes. They provides many facilities for I/O Operations Classes : BufferedReader,InputStreamReader,Console,File,FileReader,FileWritter etc Interfaces : DataOutput,DataInput,Flushable,Serializable etc |
| java.awt | It contains the set of classes for implementing graphical user interface (GUI) such as button,window,menus etc. Classes : Color,Button,TextField,Window,Graphics2D etc Interfaces : LayoutManager,ActiveEvent,Shape,Stroke etc |
| java.net | It contains the classes for networking for communication with two local computers also with servers. Classes : DatagramSocket,HttpURLConnection,InetAddress,Proxy,Socket,URL etc Interfaces : CookiePolicy,SocketOptions etc |
| java.applet | It contains the class for creating and implenting applets. Applets are running programs on internet Classes : Applet Interfaces : AppletContext,AudioClip etc |
Naming conventions allows us to differentiate between classes and other packages. So that we can easily identify which one is class and which is one is the package.