JTable添加新行

问题描述

在设计时，我有一个包含5行的JTable.现在，我必须动态添加更多行.当我添加更多行时，数组异常错误.我该如何解决这个问题?

I have a JTable with 5 rows at the time of design. Now i have to add more rows as i go dynamically. I am getting array out of bound exception error when i add more rows. How do i solve this issue ?

item_list = new javax.swing.JTable();
item_list.setModel(new javax.swing.table.DefaultTableModel(
    new Object [][] {
        {null, null, null},
        {null, null, null},
        {null, null, null},
        {null, null, null}
    },
    new String [] {
        "No.", "Description", "Cost"
    }
) {
    Class[] types = new Class [] {
        java.lang.Integer.class, java.lang.String.class, java.lang.Float.class
    };

    public Class getColumnClass(int columnIndex) {
        return types [columnIndex];
    }
});
item_list.getColumnModel().getColumn(0).setPreferredWidth(30);
item_list.getColumnModel().getColumn(1).setPreferredWidth(100);
item_list.getColumnModel().getColumn(2).setPreferredWidth(50);
jScrollPane2.setViewportView(item_list);

推荐答案

这对我有用

import javax.swing.*;
import javax.swing.table.*;
import java.awt.*;
import java.awt.event.*;

public class Grow extends JFrame {

    private static final Object[][] rowData = {{"Hello", "World"}};
    private static final Object[] columnNames = {"A", "B"};

    private JTable table;
    private DefaultTableModel model;

    public Grow() {
         Container c = getContentPane();
         c.setLayout(new BorderLayout());

         model = new DefaultTableModel(rowData, columnNames);
         table = new JTable();
         table.setModel(model);
         c.add(new JScrollPane(table), BorderLayout.CENTER);
         JButton add = new JButton("Add");
         c.add(add, BorderLayout.SOUTH);
         add.addActionListener(new ActionListener() {
             public void actionPerformed(ActionEvent ae) {
                 model.addRow(rowData[0]);
             }
         });
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         pack();
    }

    public static void main(String[] args) {
        Grow g = new Grow();
        g.setLocationRelativeTo(null);
        g.setVisible(true);
    }
}

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