Java JTable 设置选中行

Question

I need to be able to set the selected row of a JTable.

For exemple:

• when a new row is created I want to select it.
• when a row is deleted I want to remove it.

I've already deal the listeners part but I can't find a way to force update the selected row...

Does anyone have an idea?

Here a sample code for test:

import javax.swing.JFrame;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.table.DefaultTableModel;

public class JTableTest extends JFrame {
    public JTableTest() {
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);

        String[][] data = { { "Hello" }, { "World" } };
        String[] columns = {"Column"};

        JTable table = new JTable();
        table.setModel(new DefaultTableModel(data, columns));
        table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

        // table.setSelectedRow(1)

        add(table);
        setVisible(true);
        pack();
    }

    public static void main(String[] args) {
        new JTableTest();
    }
}

Answer 1

You may also want to look at:

• How to use tables
• Add Jbutton to each row of a Jtable

Runnable example

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;

public class Test {
    public static void main(String[] args) {
        new Test();
    }

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                JFrame frame = new JFrame();
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        private DefaultTableModel model = new DefaultTableModel(new String[] {"1", "2", "3"}, 0);
        private JTable table = new JTable(model);

        public TestPane() {
            setLayout(new BorderLayout());
            add(new JScrollPane(table));
            JButton add = new JButton("Add");
            JButton remove = new JButton("Remove");

            JPanel actions = new JPanel(new GridBagLayout());
            actions.add(add);
            actions.add(remove);

            add.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    String base = Character.toString('A' + model.getRowCount());
                    String[] rowData = new String[model.getColumnCount()];
                    for (int index = 0; index < model.getColumnCount(); index++) {
                        rowData[index] = base + (index + 1);
                    }
                    model.addRow(rowData);
                    int rowIndex = table.convertRowIndexToView(model.getRowCount() - 1);

                    table.getSelectionModel().clearSelection();
                    table.getSelectionModel().addSelectionInterval(rowIndex, rowIndex);
                }
            });

            remove.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    List<Integer> rows = new ArrayList<>(8);
                    for (int row : table.getSelectedRows()) {
                        int modelRow = table.convertRowIndexToModel(row);
                        rows.add(modelRow);
                    }
                    if (rows.isEmpty()) {
                        return;
                    }
                    Collections.sort(rows);
                    Collections.reverse(rows);
                    for (int row : rows) {
                        model.removeRow(row);
                    }
                }
            });

            add(actions, BorderLayout.SOUTH);
        }

    }
}