1)java.long: - This package got primary classes and interfaces essential for java program. It consists of wrapper classes, strings, threads, etc. wrapper classes are useful to create an object. Thread means process.
2)java.util: - (utility) in this util data structures are available. This package contains useful classes and interfaces like stack, linked list, hash table, arrays. etc.
3)java.io: - This package handles files and input output related tasks. (io – input output).
4)java.awt : - abstract window tool kit.
This package helps to develop GUI. It consists of important sub packages.
Java.awt.event --> event is useful to providing actions.
GUI--> graphics user interface.
5)javax.swing: - This package helps to develop GUI like java.awt. X means extended. This package is developed from another package.
6)java.net: - Client – server programming can be done using this package. Net stands for network.
7)java.applet: - applets are programs which come from a server into a client and get executed on the client machine. An applet is a program that comes to the internet server.
8)java.sql: - structured query language. This package helps to connect to database like oracle and utilize them in java. A data base is a storage data.
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