Graphical User Interface

Question 1

Procedural programming

Answer 1

is about writing procedures or methods that perform
operations on the data

Question 2

Object-oriented programming(OOP)

Answer 2

about creating objects that contain both data and
methods.
● OOP permits higher level of abstraction than traditional procedural-Oriented
Languages (such as C).

Question 3

You can create high-level abstract data types called classes

Answer 3

mimic real-life
things.
● These classes are self-contained and are reusable.

Question 4

Graphical User Interface (GUI)

Answer 4

A graphical user interface (GUI) is a system of interactive visual components for computer software. A GUI allows a user to communicate with a computer through the use of symbols, icons, menus, and pointing devices. A GUI displays objects that convey information and represent actions that can be taken by the user.

Question 5

Ide

Answer 5

Integrated development environments, or IDEs, are software platforms that provide programmers and developers a comprehensive set of tools for software development in a single product. IDEs are built to work with specific application platforms and remove barriers involved in the lifecycle of software development.

Question 6

API is the acronym for

Answer 6

application programming interface
● a software intermediary that allows two applications to talk to each other.
● APIs are an accessible way to extract and share data within and across
organizations.

Question 7

There are currently three sets of Java APIs for graphics programming:

Answer 7

AWT (Abstract Windowing Toolkit), Swing and JavaFX

Question 8

Programming GUI with AWT
:AWT package

Answer 8

AWT is huge! It consists of 12 packages of 370 classes (Swing is even bigger, with 18
packages of 737 classes as of JDK 8). Fortunately, only
2 packages - java.awt and java.awt.event - are commonly-used.

Question 9

The java.awt package contains the core AWT graphics classes:

Answer 9

● GUI Component classes, such as Button, TextField, and Label.
● GUI Container classes, such as Frame and Panel.
● Layout managers, such as FlowLayout, BorderLayout and GridLayout.
Custom graphics classes, such as Graphics, Color and Fon

Question 10

The java.awt.event package supports event handling

Answer 10

● Event classes, such as ActionEvent, MouseEvent, KeyEvent and WindowEvent,
● Event Listener Interfaces, such as ActionListener, MouseListener,
MouseMotionListener, KeyListener and WindowListener,
● Event Listener Adapter classes, such as MouseAdapter, KeyAdapter, and
WindowAdapter.
AWT provides a platform-independent and device-independent interface to develop
graphic programs that runs on all platforms, including
Windows, macOS, and Unixes.

Question 11

There are two groups of GUI elements:

Answer 11

Component (Widget, Control): Components are elementary GUI entities, such
as Button, Label, and TextField. They are also called widgets, controls in
other graphics systems.

2. Container: Containers, such as Frame and Panel, are used to hold
   components in a specific layout (such as FlowLayout or GridLayout). A
   container can also hold sub-containers.

Question 12

Class

Answer 12

You cannot write any program in Java without having a class. word class, isn’t capitalized. It is very important
that you keep this in mind, otherwise your program will return an error.

Question 13

Curly braces

Answer 13

Curly braces are the outline of the code you are running; everything
inside of them belongs to the function, class, or method you are
running

Question 14

Indentation

Answer 14

Indentation is one of the main things you need to check over to make
sure that your code works the way you want it to.

Question 15

Main method

Answer 15

You’ll notice that on the next line of code, it says public static void
main(String[] args) {}.
• This is basically the main method showing that you can access the
code file anywhere

Question 16

Comments

Answer 16

Comments do not affect your code at all.
• They are just there so you can annotate your code without making
any real changes to it.

Question 17

Print

Answer 17

• To print something in Java, you can just type in
System.out.println(“Hello world!”);
• This tells the system to output whatever is inside the parenthesis

Question 18

Terminal

Answer 18

The place where your code is outputted

Question 19

Semicolons

Answer 19

You need to place a semicolon after every function or statement
that you use otherwise your code won’t run

Question 20

Variables

Answer 20

Functions are pieces of data that are called and can store values.
Some data types are:
•int (stores integers)
•double (stores integers with decimal values)
•String (stores text)
•boolean (true or false statements)

Question 21

How to make variable

Answer 21

•To make variables, you need to name them.
•The way to name a variable is usually for the purpose that it is
created for.
•You can have numbers in the variable name, but they can’t be
the first character in the name.
•If you would like to have more than one word in the name of your
variable, the first word is all lowercase.
•If your variable name isn’t more than two words, then it should
be in all lowercase