How to Efficiently Get Selected Rows from a JTable with JCheckBox Row Selection?

Getting Selected Rows in JTable with Selected Row Tracking

Problem:
Efficiently obtaining selected rows from a JTable with a JCheckBox in the first column for row selection. Sequential traversal becomes inefficient with a large number of rows.

Traditional Approach:
Sequentially iterating through all rows to get selected rows. This approach is problematic when dealing with thousands of rows.

Proposed Approach:
Model-Based Tracking:

• Update a Set containing the selected row indices whenever the JCheckBox value changes.
• A listener class on the table model updates the Set based on row selection.

Code Example:

import javax.swing.table.AbstractTableModel;
import java.util.Set;
import java.util.TreeSet;

public class CheckModel extends AbstractTableModel {

    // ...

    private Set<Integer> checked = new TreeSet<>();

    // ...

    @Override
    public void setValueAt(Object aValue, int row, int col) {
        boolean b = (Boolean) aValue;
        rowList.set(row, b);
        if (b) {
            checked.add(row);
        } else {
            checked.remove(row);
        }
        fireTableRowsUpdated(row, row);
    }
}

Additional Optimization:

• Use a lightweight data structure, such as a TreeSet, to store the selected row indices for efficient iteration.
• Consider using a different data structure for storing selected rows if memory consumption becomes an issue.

Benefits of the Model-Based Approach:

• Constant time access to the selected rows, regardless of the total number of rows.
• No need for sequential traversal, making the selection retrieval highly efficient.

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