How to Correctly Use SwingPropertyChangeSupport for Dynamic JTextArea Updates?

SwingPropertyChangeSupport for Dynamic JTextArea Updates

Issue Description:

The goal is to dynamically update a JTextArea's contents based on changes made in an input dialog. When the input is entered and confirmed, the array is updated correctly, but the GUI does not reflect the modifications.

Code Overview:

The provided code utilizes SwingPropertyChangeSupport to facilitate property change events. The array is updated using arrayForUpdate.instructionsIn(newValue, a), where newValue is the modified input and a is the array index.

Troubleshooting the Issue:

After inspecting the code, the issue appears to lie in the setBoundProperty method within the ArrayForUpdating class.

<code class="java">public void setBoundProperty(String boundProperty) {
    String oldValue = this.boundProperty;
    System.out.println("old = " + oldValue);
    String newValue = boundProperty;
    System.out.println("new = " + newValue);
    this.boundProperty = newValue;
    spcSupport.firePropertyChange(BOUND_PROPERTY, oldValue, newValue);
}</code>

The issue with the setBoundProperty method is that the firePropertyChange method is invoked with the incorrect arguments. The affected code is marked as follows:

<code class="java">    spcSupport.firePropertyChange(BOUND_PROPERTY, oldValue, newValue);</code>

In this specific case, the correct usage of firePropertyChange would be:

<code class="java">    spcSupport.firePropertyChange(BOUND_PROPERTY, boundProperty, newValue);</code>

With the correction applied, the following code accurately reflects the modified snippet:

<code class="java">public void setBoundProperty(String boundProperty) {
    String oldValue = this.boundProperty;
    System.out.println("old = " + oldValue);
    String newValue = boundProperty;
    System.out.println("new = " + newValue);
    this.boundProperty = newValue;
    spcSupport.firePropertyChange(BOUND_PROPERTY, oldValue, newValue);
}</code>

Summary:

By making this adjustment to the setBoundProperty method, the binding process between the array and JTextArea is established correctly. As a result, the GUI will now successfully reflect any changes made through the input dialog.

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