How to Connect a JList in One JPanel to a JTextPane in Another?

Wiring One Pane to Another

Connecting PaneWithList to Output

In the Main class, Main.java, we have multiple panes including PaneWithList and Output. PaneWithList contains a JList that displays data, while Output is a JTextPane that should display the data selected in the JList. The question arises: how can we connect PaneWithList to Output to achieve this?

PropertyChangeSupport for Data Output

One potential solution is to use PropertyChangeSupport. This mechanism allows the PaneWithList to fire an event when a row in the JList is selected. Main can listen for this event and update the Output JTextPane accordingly.

Using Observer Pattern for Communication

Another approach is to employ the observer pattern. In this pattern, the PaneWithList is an observable that notifies its observers when data changes. Output can be an observer that listens to these changes and updates itself.

Example Implementation Using Observer Pattern

The provided code snippet demonstrates how to implement the observer pattern to connect PaneWithList to Output:

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

class ObserverPanel extends JPanel {

    private JLabel title = new JLabel("Value received: ");
    private JLabel label = new JLabel("null", JLabel.CENTER);

    public ObserverPanel() {

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