Java API Documentation:
- Java Library is a pre-defined collection of packages, classes, interface etc.
- Library is technically called “Java API”
- The documentation (theoretical explanation) of every program available as API documentation.
- Oracle corporation providing API documentation as official website.
- https://docs.oracle.com/javase/7/docs/api/ is giving information about library.
Search “java api” in Google:

The Website providing complete information of java library about packages, classes, interface, methods, variables etc.,
