What are the three packages in Java?

A package is a collection of similar types of Java entities such as classes, interfaces, subclasses, exceptions, errors, and enums . A package can also contain sub-packages.

Three packages of Java Class Library are:

Package in Java is a mechanism to encapsulate a group of classes, sub packages and interfaces . Packages are used for: Preventing naming conflicts. For example there can be two classes with name Employee in two packages, college. staff.4 Mar 2022

As mentioned in the beginning of this guide that we have two types of packages in java. 1) User defined package: The package we create is called user-defined package. 2) Built-in package: The already defined package like java.io.