The Java API is a library of prewritten classes, that are free to use, included in the Java Development Environment.
The library contains components for managing input, database programming, and much much more. The complete list can be found at Oracles website: https://docs.oracle.com/javase/8/docs/api/.
The library is divided into packages and classes. Meaning you can either import a single class (along with its methods and attributes), or a whole package that contain all the classes that belong to the specified package.
To use a class or a package from the library, you need to use the import keyword:
Syntax
import package.name.Class; // Import a single class
import package.name.*; // Import the whole package
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