Java Swing Cellphone Inventory GUI Application

Code Breakdown: Java GUI CellPhone Inventory Management

The provided Java code presents a comprehensive Graphical User Interface (GUI) application for streamlined cellphone inventory management. The CellPhoneInventory class, extending JFrame, orchestrates a user-friendly interface with labels, text fields, and buttons. This code is well-suited for those seeking help with their Java assignment, as it covers essential GUI components and event-driven programming concepts. Users can seamlessly add cellphone details, handle exceptions for input validation, clear input fields, save the inventory to a file ("cellPhones.txt"), and exhibit the saved inventory. The utilization of a BorderLayout enhances organization, making it an excellent foundation for individuals looking for a practical and visually appealing solution for their Java programming assignments.

Block 1: Class Declaration and Instance Variables

public class CellPhoneInventory extends JFrame {
// Instance variables
JLabel labelModel, labelManufacturer, labelRetailPrice, labelBanner;
JTextField jTextFieldModel, jTextFieldManufacturer, jTextFieldRetailPrice;
JButton jButtonAdd, jButtonSave, jButtonNext, jButtonShow;
JPanel newPanel, buttonPanel;
ArrayList phoneArrayList = new ArrayList();
CellPhoneInventory() {
// Constructor code
}
}

Discussion:

CellPhoneInventory class extends JFrame and contains instance variables for GUI components (labels, text fields, buttons), panels, and an ArrayList to store cellphone objects.
Constructor initializes GUI components, sets the layout, and adds components to the frame.

Block 2: GUI Component Initialization

setTitle("Cellphone Inventory");
setLayout(new BorderLayout());
// ... (code for initializing labels, text fields, buttons, and panels)
add(labelBanner, BorderLayout.NORTH);
add(newPanel, BorderLayout.CENTER);
add(buttonPanel, BorderLayout.SOUTH);

Discussion:

Sets the title and layout for the frame.
Initializes GUI components like labels, text fields, buttons, and panels.
Adds components to the frame in specific regions (North, Center, South) defined by BorderLayout.

Block 3: Add Button Action Listener

jButtonAdd.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// ... (code for adding cellphone to inventory and displaying it)
}
});

Discussion:

Attaches an action listener to the "Add" button.
On button click, it retrieves user input, creates a CellPhone object, handles exceptions, adds it to the inventory list, and displays the inventory in a dialog box.

Block 4: Next Button Action Listener

jButtonNext.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// ... (code for clearing text fields)
}
});

Discussion:

Attaches an action listener to the "Next" button.
On button click, it clears the text fields for the user to input the next cellphone details.

Block 5: Save Button Action Listener

jButtonSave.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// ... (code for saving cellphone inventory to a file)
}
});

Discussion:

Attaches an action listener to the "Save" button.
On button click, it uses a Formatter to write the cellphone inventory to a file named "cellPhones.txt".

Block 6: Show Button Action Listener

jButtonShow.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// ... (code for displaying the saved inventory from the file)
}
});

Discussion:

Attaches an action listener to the "Show Inventory" button.
On button click, it reads the saved inventory from the "cellPhones.txt" file and displays it in a dialog box.

Conclusion

In summary, the provided Java code encapsulates a basic Cellphone Inventory Management application using Swing GUI components. It employs an object-oriented approach, creating a CellPhone class for representing phones and extending the JFrame class for the graphical interface. The application allows users to input cellphone details, handle exceptions for invalid input, add phones to an inventory, save the inventory to a file, and display the saved inventory. The code exhibits a clear separation of concerns with distinct blocks handling GUI initialization, button actions, and file operations. This application serves as a foundational example for beginners learning Java GUI programming and file I/O concepts.