3.1 Lesson Outcomes

After completing this lesson, learners will be able to:

• Build GUI applications using Java.
• Apply event-driven programming.
• Create user interaction using GUI components.
• Develop contextual Java applications for specific sectors.
• Build operable Java solutions using frameworks and Java functionalities.

3.2 Overview

Java GUI applications provide visual interaction between users and software systems. Java supports GUI development through:

• Swing,
• JavaFX,
• and AWT.

GUI applications are important in:

• retail systems,
• healthcare systems,
• cloud dashboards,
• IoT monitoring systems,
• and network applications.

This lesson introduces learners to practical GUI application development using Java programming.

Understanding GUI application development is important because modern software applications require user-friendly interfaces and interactive functionality.

Case Study / Scenario

You are a junior Java developer at a South African technology company that provides smart software solutions for SMEs.

The company requests a contextual Java GUI application for a chosen sector such as:

• retail,
• healthcare,
• IoT,
• cloud systems,
• mobile applications,
• or networking.

The application must:

• include GUI components,
• process user input,
• display outputs,
• and provide sector-specific functionality.

PA0301 — Build a GUI Application Using Java

GUI applications use visual components such as:

• buttons,
• labels,
• text fields,
• and windows.

Java Example:

import javax.swing.*;

import java.awt.event.*;

public class RetailApp {

public static void main(String[] args) {

JFrame frame = new JFrame(“Retail Stock Manager”);

JButton btnAdd = new JButton(“Add Stock”);

JButton btnView = new JButton(“View Stock”);

JLabel lblInfo = new JLabel(“Stock Info will appear here.”);

btnAdd.setBounds(50, 50, 150, 30);

btnView.setBounds(220, 50, 150, 30);

lblInfo.setBounds(50, 100, 300, 30);

frame.add(btnAdd);

frame.add(btnView);

frame.add(lblInfo);

frame.setSize(450, 200);

frame.setLayout(null);

frame.setVisible(true);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

final int[] stock = {0};

btnAdd.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

stock[0] += 10;

lblInfo.setText(“Current Stock: “ + stock[0]);

}

});

btnView.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

lblInfo.setText(“Viewing Stock: “ + stock[0]);

}

});

}

}

Expected Behaviour

• Clicking Add Stock increases stock values.
• Clicking View Stock displays stock information.
• GUI components respond to user actions.
• The application operates without runtime errors.

Practical Activity

Learners must:

• create Java GUI applications,
• add GUI components,
• apply event-driven programming,
• process user input,
• and display outputs dynamically.

Example Sector Applications

Retail Sector

• Stock management system
• Sales reporting system
• Invoice generator

Healthcare Sector

• Patient booking system
• Appointment management system

IoT Sector

• Smart temperature monitoring dashboard
• Sensor display system

Cloud-Based Application

• Employee attendance dashboard
• Cloud monitoring interface

Network Application

• Chat application
• Client-server communication interface

Practical Activity

Learners may:

• customize sector functionality,
• expand GUI features,
• and implement advanced application logic.

AK0301 — Java Programming Functionalities

Java GUI Functionality — Purpose

JFrame — Creates application windows
JButton — Handles user actions
JLabel — Displays text
ActionListener — Handles events
Arrays — Store application data
Variables — Store values
Methods — Organize functionality

Practical Activity

Learners must:

• explain GUI functionalities,
• identify event-driven programming concepts,
• and apply Java GUI principles.

IAC0301 — Expected Results are Achieved and the Basic GUI Application is Operable

Expected Results

• GUI components display correctly.
• Buttons respond to user interaction.
• Application data updates successfully.
• No runtime errors occur.
• Sector-specific functionality operates correctly.
• User interaction behaves as expected.

3.5 Key Notes / Summary

• Java GUI applications provide visual interaction.
• Swing and JavaFX support GUI development.
• Event-driven programming responds to user actions.
• GUI components improve usability.
• Arrays and variables store application data.
• Java GUI systems are widely used in software development.