JTable根據ScrollPane的大小調整大小

Question

當我調整包含JTable的窗口的大小時，我試圖使JTable自動調整其大小。

如以下示例所示： http : //docs.oracle.com/javase/tutorial/uiswing/examples/components/SimpleTableDemoProject/src/components/SimpleTableDemo.java

JTable將調整其寬度，如果高度太小而無法顯示全部內容，則JTable還將在右側具有滾動條。

這是JFrame，我使用單獨的類擴展了JPanel：

public class GUIFrame 
{

public static void main(String[] args)
{

    //Setting up JFrame's basic properties
    JFrame mainFrame = new JFrame("Muney Manager");
    mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    //Setting up panels:
    JPanel mPanel = new JPanel();
    mPanel.setLayout(new BoxLayout(mPanel,BoxLayout.PAGE_AXIS));

    TablePanel tPanel = new TablePanel();
    ToolBar buttonPanel = new ToolBar(tPanel);

    mPanel.add(buttonPanel);
    mPanel.add(tPanel);

    //Setting up Panels and Frame to be displayed :3
    mainFrame.getContentPane().add(mPanel);
    mainFrame.pack();
    mainFrame.setVisible(true);

}

這是包含JTable的一個：

public class TablePanel extends JPanel
{

//DefaultTableModel is needed for adding new rows
private JTable table;
private DefaultTableModel tmodel;

private JScrollPane scrollPane;

//Table's column name
private String[] columnNames = {"Date",
                                "Category",
                                "Details",
                                "Add/Subtract",
                                "Total"};


Object[][] data = {
        {20140925, "Grocery", "Supermarket", -5.23,600.00},
        {20141013,"Car Maintenance", "Changing Tires", -200.00, 400.00}
};




public TablePanel()
{

    //Initializing tmodel and putting it into table
    //It's needed for "adding rows" method
    tmodel = new DefaultTableModel(data, columnNames);
    table = new JTable();

    table.setModel(tmodel);


    //Setting up JScrollPane, table Headder
    //and make scrollPane visible 
    table.setFillsViewportHeight(true);
    add(new JScrollPane(table));

}

由於某種原因，我無法正常工作，我的代碼有什么問題？ JTable的寬度不會調整大小，而且我似乎也無法在右側獲得滾動條

Answer 1

考慮改用BorderLayout ...

public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        @Override
        public void run() {
            JFrame mainFrame = new JFrame("Muney Manager");
            mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

            //Setting up panels:
            JPanel mPanel = new JPanel();
            mPanel.setLayout(new BorderLayout());

            TablePanel tPanel = new TablePanel();
            ToolBar buttonPanel = new ToolBar(tPanel);

            mPanel.add(buttonPanel, BorderLayout.NORTH);
            mPanel.add(tPanel);

            //Setting up Panels and Frame to be displayed :3
            mainFrame.getContentPane().add(mPanel);
            mainFrame.pack();
            mainFrame.setVisible(true);
        }
    });
}

或者，如果您想要更多控制權，甚至可以使用GridBagLayout

更新

JPanel默認使用FlowLayout ，嘗試將TablePanel更改為也使用BorderLayout 。

public TablePanel()
{
    setLayout(new BorderLayout());

    //Initializing tmodel and putting it into table
    //It's needed for "adding rows" method
    tmodel = new DefaultTableModel(data, columnNames);
    table = new JTable();

    table.setModel(tmodel);


    //Setting up JScrollPane, table Headder
    //and make scrollPane visible 
    table.setFillsViewportHeight(true);
    add(new JScrollPane(table));

}