Error adding Row into JTable

问题

I have a JButton which, once it is pressed, adds a row into a JTable. I have tried to make this by implementing the following code.

columNames = new Vector<>();
columNames.addElement("Name");
columNames.addElement("CC");
columNames.addElement("Age");
columNames.addElement("PhoneNumber");
columNames.addElement("Date");
columNames.addElement("Amount$");

Object[] dataList = {"name", "cc", "age", "phone", "date", "amount"};

data = new DefaultTableModel(columNames, 0);
data.addRow(dataList);

table = new JTable(data);
JScrollPane scrollTable = new JScrollPane(table);
scrollTable.setBounds(22, 78, 764, 177);
scrollTable.setViewportView(table);

//ActionListener method!.

if(e.getActionCommand().equals("Add client"))
{
    Object[] dataList = {"name", "cc", "age", "phone", "date", "amount"};
    data.addRow(dataList);

    DefaultTableModel defaut = (DefaultTableModel) table.getModel();
    defaut.addRow(dataList);
}

It throws Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException:-1

How can I solve it?

回答1:

As shown in the complete example below, your fragments appear to work correctly. The example may help you isolated the problem in your full code. In addition,

Instead of setBounds(), override getPreferredScrollableViewportSize() to return a multiple of getRowHeight(), as suggested here, and pack() the enclosing window.
See also What causes a java.lang.ArrayIndexOutOfBoundsException and how do I prevent it?
As suggested here, repeated failures to update the TableModel suggests that you may be referencing an unintended instance of an object.

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.util.Vector;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;

/**
 * @see https://stackoverflow.com/a/38926460/230513
 */
public class Test {

    private final Object[] dataList = {"name", "cc", "age", "phone", "date", "amount"};

    private void display() {
        JFrame f = new JFrame("Test");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        Vector columNames = new Vector<>();
        columNames.addElement("Name");
        columNames.addElement("CC");
        columNames.addElement("Age");
        columNames.addElement("Phone");
        columNames.addElement("Date");
        columNames.addElement("Amount$");
        DefaultTableModel data = new DefaultTableModel(columNames, 0);
        data.addRow(dataList);
        JTable table = new JTable(data);
        JScrollPane scrollTable = new JScrollPane(table);
        scrollTable.setViewportView(table);
        f.add(new JScrollPane(table));
        f.add(new JButton(new AbstractAction("Add") {
            @Override
            public void actionPerformed(ActionEvent e) {
                data.addRow(dataList);
            }
        }), BorderLayout.PAGE_END);

        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Test()::display);
    }
}

来源：https://stackoverflow.com/questions/38926148/error-adding-row-into-jtable

标签

java

arrays

swing

jtable

defaulttablemodel