libraries (Java)

Question

hello, i dont have an clear picture what libraries are
are they set of new methods, functions, classes
so YOU DONT have 2 reinvent the wheel
like maybe your spend years coding just to define some Args

correct me if thats not true what im seeing what they are

Answer 1

java.net.*; ???

Answer 2

Java library's are library's whit which you can run new commands like the Java.util.scanner

Answer 3

With out this library can't scanned anything
PS:java.util.scanner.*; is a package of the library java.util

Answer 4

im talking about those libraries on the internet

Answer 5

no, im talking about those libs like one google created that 3 party

Answer 6

Yes Sarah, you're right, libraries are a collection of classes regrouped by theme, they give a cummun and normalised difinition of functions and methods needed in a certain field.