Which package contains the classes and interfaces required to create and manipulate guis?

Answer 1

Abstract Window Toolkit (AWT) package contains all GUI specific classes and interfaces.
To import write
import java. awt.*;
Write some description about your question, with specific to why and how you need answer so that you get better answer...
For more details read awt package and java advanced concepts.
Edit: And there is Java Swings, which are light weight components and better compare to awt which heavy weight.