DefaultTableModel示例程序（Java）

深藏阁楼爱情的钟 2022-12-07 12:09 190阅读 0赞

The Java code below is a simple program used to show the different methods of a `DefaultTableModel` in action.

下面的Java代码是一个简单的程序，用于显示实际使用的`DefaultTableModel`的不同方法。

## 背景 **(** Background **)** ##

The first [JTable][] created uses a two-dimensional object array to populate the row data and a `String` array to populate the column names. The program shows that although you can get to the `TableModel` interface of the table model to get and set values for individual table cells created for this `JTable` , you cannot get to the `DefaultTableModel` in order to manipulate the data any further.

创建的第一个[JTable][]使用二维对象数组填充行数据，并使用`String`数组填充列名。 该程序显示，尽管您可以进入表模型的`TableModel`接口以获取和设置为此`JTable`创建的单个表单元格的值，但是您无法进入`DefaultTableModel`以便进一步操作数据。

The second `JTable` is created by defining a `DefaultTableModel` with the data first. This allows the full range of actions by the table model to be performed on the `JTable` (e.g, adding a row, inserting a row, removing a row, adding a column, etc.).

通过首先定义一个`DefaultTableModel`数据来创建第二个`JTable` 。 这允许在`JTable`上执行表模型的所有动作(例如，添加行，插入行，删除行，添加列等)。

You might also be interested in the `AbstractTableModel` class. This class allows you to create a custom table model for a JTable where you can store the data in any way you like. It does not have to be in a `Vector` of `Vectors`.

您可能也对`AbstractTableModel`类感兴趣。 此类允许您为JTable创建自定义表模型，您可以在其中以自己喜欢的任何方式存储数据。 它不必位于`Vectors`的`Vector`中。

## Java代码 **(** Java Code **)** ##

![486369907-56a5484d3df78cf772876834.jpg][]

**Note:** See [DefaultTableModel Overview][] for some more information.

**注意：**有关更多信息，请参见[DefaultTableModel概述][DefaultTableModel Overview] 。

import java.awt.BorderLayout;
    import java.awt.EventQueue;
    import javax.swing.JFrame;
    import javax.swing.JScrollPane;
    import javax.swing.JTable;
    import javax.swing.table.TableModel;
    import javax.swing.table.DefaultTableModel;
    public class TableExample {
    public static void main(String[] args) {
    //Use the event dispatch thread for Swing components
    EventQueue.invokeLater(new Runnable()
    {
    @Override
    public void run()
    {
    new TableExample().BuildGUI();
    }
    });
    }
    public void BuildGUI()
    {
    JFrame guiFrame = new JFrame();
    //make sure the program exits when the frame closes
    guiFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    guiFrame.setTitle("Creating a Table Example");
    guiFrame.setSize(700,860);
    //This will center the JFrame in the middle of the screen
    guiFrame.setLocationRelativeTo(null);
    //Create a two dimensional array to hold the data for the JTable.
    Object[][] data = {
         {1,1,1},{2,2,2},{3,3,3},{4,4,4}};
    //A string array containing the column names for the JTable.
    String[] columnNames = {"Column 1","Column 2","Column 3"};
    //Create the JTable using the data array and column name array.
    JTable exampleJTable = new JTable(data, columnNames);
    //Create a JScrollPane to contain for the JTable
    JScrollPane sp = new JScrollPane(exampleJTable);
    //The JTable will provides methods which access the DefaultTabelModel.
    //created when the JTable object was created
    System.out.println(exampleJTable.getValueAt(2, 2));
    //The DefaultTableModel can be acessed through the getModel method.
    TableModel tabModel = exampleJTable.getModel();
    //Provides the same output as the exampleJTable.getValueAt method call
    //above.
    System.out.println(tabModel.getValueAt(2, 2).toString());
    //Note: We can't cast the TableMode returned from the getModel method
    //to a DefaultTableModel object because it is implemented as an anonymous
    //inner class in the JTable. So let's create a JTable with a DefaultTableModel
    //we can use:
    //Create a DeafultTableModel object for another JTable
    DefaultTableModel defTableModel = new DefaultTableModel(data,columnNames);
    JTable anotherJTable = new JTable(defTableModel);
    //Create a JScrollPane to contain for the JTable
    JScrollPane anotherSP = new JScrollPane(anotherJTable);
    //an array holding data for a new column
    Object[] newData = {1,2,3,4};
    //Add a column
    defTableModel.addColumn("Column 4", newData);
    //an array holding data for a new row
    Object[] newRowData = {5,5,5,5};
    //Add a row
    defTableModel.addRow(newRowData);
    //an array holding data for a new row
    Object[] insertRowData = {2.5,2.5,2.5,2.5};
    //Insert a row
    defTableModel.insertRow(2,insertRowData);
    //Change a cell value
    defTableModel.setValueAt(8888, 3, 2);
    //Add the JScrollPanes to the JFrame.
    guiFrame.add(sp, BorderLayout.NORTH);
    guiFrame.add(anotherSP, BorderLayout.SOUTH);
    guiFrame.setVisible(true);
    }
    }

> 翻译自: [https://www.thoughtco.com/defaulttablemodel-example-program-2033893][https_www.thoughtco.com_defaulttablemodel-example-program-2033893]

[JTable]: https://www.thoughtco.com/how-to-create-a-simple-table-2033894
[486369907-56a5484d3df78cf772876834.jpg]: /images/20221123/803af9b0948f42e2914d66d6004c40e1.png
[DefaultTableModel Overview]: https://www.thoughtco.com/defaulttablemodel-overview-2033890
[https_www.thoughtco.com_defaulttablemodel-example-program-2033893]: https://www.thoughtco.com/defaulttablemodel-example-program-2033893