JTable在JScrollPane中正確對齊

Question

我在JScrollView內有一個JTable但是在滾動條上似乎沒有更好地對齊，我猜這是因為alignment.Moreover緣故，而且這是真實代碼的片段：

    JFrame frame = new JFrame();
    frame.setResizable(false);
    frame.setBounds(100, 100, 771, 453);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().setLayout(null);

    JPanel panel = new JPanel();
    panel.setBorder(new MatteBorder(1, 1, 1, 1, (Color) new Color(0, 0, 0)));
    panel.setBounds(10, 32, 747, 370);
    frame.getContentPane().add(panel);
    panel.setLayout(null);

    JPanel VPanel = new JPanel();
    VPanel.setBounds(297, 43, 440, 224);
    panel.add(VPanel);

    JTable TableV = new JTable();
    TableV.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    TableV.getTableHeader().setReorderingAllowed(false);
    DefaultTableModel Model = new DefaultTableModel(0, 0);
    String header[] = new String[] { "Country", "ID", "WAN IP", "User", "OS", "Java version" };

    VPanel.add(new JScrollPane(TableV, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED));

    // just adding some data to fill the table
    Model.setColumnIdentifiers(header);
    //set model into the table object
    TableV.setModel(Model);

     //just adding some diff data to check if it scrolls down
     for (int count = 1; count <= 50; count++)
     {
        Model.addRow(new Object[] { "data1", "data2", "data3", "data4", "data5", "data6" });
     }

     for (int count = 1; count <= 70; count++)
     {
        Model.addRow(new Object[] { "data100", "data200", "data300", "data400", "data500", "data600" });
     }

     frame.setVisible(true);

Answer 1

了解VPanel（應將其重命名為vPanel以符合Java命名規則）使用FlowLayout，因此滾動窗格可能不太適合其中。 如果希望滾動窗格填充它，請為其提供BorderLayout並添加JScrollPane BorderLayout.CENTER。

例如，

import java.awt.BorderLayout;
import java.awt.Dimension;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;

@SuppressWarnings("serial")
public class TableFoo extends JPanel {
    private static final String[] HEADER = new String[] { "Country", "ID", "WAN IP", "User", "OS", "Java version" };
    private static final int PREF_W = 500;
    private static final int PREF_H = 400;
    private DefaultTableModel model = new DefaultTableModel(HEADER, 0);
    private JTable table = new JTable(model);

    public TableFoo() {
        for (int count = 0; count < 50; count++) {
            model.addRow(new Object[] { "data1", "data2", "data3", "data4", "data5", "data6" });
        }

        for (int count = 0; count < 70; count++) {
            model.addRow(new Object[] { "data100", "data200", "data300", "data400", "data500", "data600" });
        }

        JScrollPane scrollPane = new JScrollPane(table);

        setLayout(new BorderLayout());
        add(scrollPane, BorderLayout.CENTER);
    }

    @Override
    public Dimension getPreferredSize() {
        if (isPreferredSizeSet()) {
            return super.getPreferredSize();
        }
        return new Dimension(PREF_W, PREF_H);
    }

    private static void createAndShowGui() {
        JFrame frame = new JFrame("TableFoo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(new TableFoo());
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGui();
            }
        });
    }
}