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Core Java Interview Questions and Answers

Ques. Explain the usage of Java packages.
Ans. This is a way to organize files when a project consists of multiple modules. It also helps resolve naming conflicts when different packages have classes with the same names. Packages access level also allows you to protect data from being used by the non-authorized classes.

java.lang basic language functionality and fundamental types
java.util collection data structure classes
java.io file operations
java.math multiprecision arithmetics
java.nio the New I/O framework for Java
java.net networking operations, sockets, DNS lookups
java.security key generation, encryption and decryption
java.sql Java Database Connectivity (JDBC) to access databases
java.awt basic hierarchy of packages for native GUI components
javax.swing hierarchy of packages for platform-independent rich GUI components
java.applet classes for creating an applet
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