How to Efficiently Retrieve Selected Rows from a JTable with a Custom TableModel?

Obtaining Selected Rows in JTable with Custom TableModel

Background:

In JTable, sometimes it is necessary to retrieve rows that have been checked in a specific column. For seamless and efficient operation, it is important to implement an effective approach to gather these selected rows.

Traditional Approach:

Initially, developers may employ a sequential traversal of rows, selecting those with checked values. However, this method becomes inefficient for tables with thousands of rows.

Enhanced Approach:

To optimize this process, it is recommended to:

• Update a Set of Selected Rows in the TableModel: Maintain a Set within the table model that represents the checked rows. When a cell value changes in the corresponding column, update this set accordingly.
• Monitor TableModel Changes: Add a TableModelListener to the table model. This listener can detect changes in the checked rows and update the collection of selected rows.

Example Implementation:

The provided code demonstrates this approach, where the table model CheckModel maintains a TreeSet of checked rows and notifies listeners when rows are selected or deselected. The DisplayPanel listens to the table model and displays the selected rows in a JList.

Benefits:

Using a specialized table model with a Set of selected rows provides the following advantages:

• Efficient Update: Updates to the selected row collection are significantly faster than sequential traversal for large tables.
• Optimized Retrieval: The selected rows can be obtained directly from the Set, ensuring a quick lookup operation.
• Event-Driven Management: Listening to table model changes allows for automatic synchronization between the selected rows and the table UI, reducing development effort.

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