How Can I Efficiently Retrieve Selected Rows from a JTable with Checkboxes?

Efficient Retrieval of Selected Rows in JTable Using AbstractTableModel

When dealing with large tables with checkboxes in the first column to allow row selection, obtaining the selected rows can become inefficient if done sequentially through all rows. This article explores an alternative approach involving a listener-based mechanism to avoid unnecessary traversal.

In the given code example, the custom TableModel, CheckModel, maintains a Set of selected row indices in the checked variable. This set is updated whenever the checkbox value (column 1) changes through the setValueAt() method.

An adjacent JList visualizes the currently selected row numbers by listening to changes in the CheckModel. This ensures that the list always reflects the latest selected rows. The TreeSet data structure preserves the natural order of elements.

Advantages of the Listener-Based Approach:

• Improved Performance: Only the rows that are actually checked are updated, eliminating the need to iterate through all rows. This approach scales well even with large tables.
• Event-Driven Update: Changes to the selected rows are immediately reflected in the listener, maintaining real-time accuracy.
• Reusable Solution: The listener-based mechanism can be reused in other table models where fast retrieval of selected rows is desired.

Additional Considerations:

• Memory Consumption: The TreeSet incurs some overhead in terms of memory compared to an ArrayList, but its efficiency advantages make this a worthwhile trade-off.
• Selection Range: If multiple contiguous rows are selected with a mouse drag, the listener will only detect the change in the checkbox of the last selected row. Additional logic might be needed to capture the full selection range.
• Multiple Selection Modes: This approach assumes that only one row can be selected at a time. For multiple selection modes, modifications to the listener may be necessary.

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