Answer 1

graphical user interface

Answer 2

gui allows us to interact with computer smoothly with graphics

Answer 3

You already might know meaning of it but in terms of java There are two sets of Java APIs for graphics programming: AWT (Abstract Windowing Toolkit) and Swing.

Answer 4

If you are not creating a terminal application, you want to use some Graphical Interface for your application.
There is much more libs for creating gui for Java, than just obsolete AWT and unused Swing. JavaFX for example. - The most popular GUI libraries for Java web applications development.
Swing is very good for begginers though. Especially when you want to fast design simple (or semi-complex) gui for your project.

Answer 5

Graphical user interface
Examples in Java include AWT, swing, javafx