JScrollPane中的JTable未正确显示

Question

通过单击Experiment Parameters选项卡中的一个按钮（参见下面的屏幕截图），我创建并运行一个“PreviewAction”，它创建了一个新的选项卡，并用必要的组件填充它。下面是DataReviewAction的代码。编辑：我还发布了一个自包含的最小版本，它模拟了真实项目中的条件，并展示了相同的行为。

import java.awt.BorderLayout;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.table.DefaultTableModel;

public class MyFrame extends JFrame {

private JPanel panel1;
private JTabbedPane tabs;
private JButton runButton;

public MyFrame() {
    tabs = new JTabbedPane();
    panel1 = new JPanel();
    runButton = new JButton("go!");
    runButton.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            runButtonActionPerformed(evt);
        }
    });
    panel1.add(runButton);
    tabs.addTab("first tab", panel1);
    this.add(tabs);
    pack();
}

public static void main(String args[]) {
    try {
        for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager
                .getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                javax.swing.UIManager.setLookAndFeel(info.getClassName());
                break;
            }
        }
    } catch (ClassNotFoundException ex) {
        java.util.logging.Logger.getLogger(MyFrame.class.getName()).log(
                java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(MyFrame.class.getName()).log(
                java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(MyFrame.class.getName()).log(
                java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(MyFrame.class.getName()).log(
                java.util.logging.Level.SEVERE, null, ex);
    }

    /* Create and display the form */
    java.awt.EventQueue.invokeLater(new Runnable() {

        public void run() {
            MyFrame frame = new MyFrame();
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);
        }
    });
}

private void runButtonActionPerformed(java.awt.event.ActionEvent evt) {
    /*
     * Normally there is more stuff happening here but this much will do for
     * the sake of example
     */
    List<String[]> data = new LinkedList<String[]>();
    for (int i = 1; i < 1000; i++)
        data.add(new String[] { "entry1", "value1", "value2", "value3" });

    SwingUtilities.invokeLater(new DataPreviewAction(data, tabs));
}

public class DataPreviewAction implements Runnable {

    private JTabbedPane contentHolder;
    private List<String[]> data;

    public DataPreviewAction(List<String[]> data, JTabbedPane comp) {
        this.contentHolder = comp;
        this.data = data;
    }

    @Override
    public void run() {
        DefaultTableModel previewModel = new DefaultTableModel() {
            @Override
            public boolean isCellEditable(int row, int column) {
                return false;
            }
        };

        for (String[] datarow : data) {
            previewModel.addRow(Arrays.copyOf(datarow, datarow.length,
                    Object[].class));
        }

        JTable table = new JTable(previewModel);

        JPanel buttonPanel = new JPanel();
        buttonPanel.add(new JButton("A button"));
        buttonPanel.add(new JLabel(
                "Some description for the awesome table below "));
        buttonPanel.add(new JButton("another button"));

        JScrollPane tablePanel = new JScrollPane(table);
        JPanel container = new JPanel();
        container.setLayout(new BorderLayout());
        container.add(buttonPanel, BorderLayout.NORTH);
        container.add(tablePanel, BorderLayout.CENTER);
        contentHolder.addTab("Preview", container);
        contentHolder.validate();
        contentHolder.repaint();
    }
}
}

这里至少存在两个问题：

1. JTable（或JScrollPane)根本不呈现
2. JScrollPane没有框架本身那么宽，我不知道为什么

我在挥杆方面不是很好，所以我可能错过了一些基本的东西。我已经检查了数据文件的读取是否正确，并且数据模型包含正确数量的行(1000+)。因此表不应为空。

建议？

Answer 1

JPanel buttonPanel = new JPanel();
buttonPanel.add(new JButton("A button"));
buttonPanel.add(new JLabel("Some description for the awesome table below "));
buttonPanel.add(new JButton("another button"));

JScrollPane tablePanel = new JScrollPane(table);
JPanel container = new JPanel();
container.add(buttonPanel,BorderLayout.NORTH);
container.add(tablePanel,BorderLayout.SOUTH);
contentHolder.addTab("Preview", container);
    //contentHolder.validate(); <- NO good
    //contentHolder.repaint();  <- --"---
}

• JPanel使用FlowLayout（在API中实现，仅接受PreferredSize，默认情况下不可调整大小），正确的输出如attn image中所示，您必须将JPanel的默认LayoutManager更改为BorderLayout，然后将代码行

.

container.add(buttonPanel,BorderLayout.NORTH);
container.add(tablePanel,BorderLayout.SOUTH);

• 将扩展JComponents，并且可以按照您的预期工作，但我认为TablePanel应该放在中心区域

编辑：

import java.awt.BorderLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;

public class MyFrame extends JFrame {

    private JPanel panel1;
    private JTabbedPane tabs;
    private JButton runButton;
    private JFrame frame = new JFrame();
    private String[] columnNames = {"Nama", "Nim", "IP", "Hapus Baris ke"};
    private Object[][] data = {
        {"igor", "B01_125-358", "1.124.01.125", true},
        {"lenka", "B21_002-242", "21.124.01.002", true},
        {"peter", "B99_001-358", "99.124.01.001", false},
        {"zuza", "B12_100-242", "12.124.01.100", true},
        {"jozo", "BUS_011-358", "99.124.01.011", false},
        {"nora", "B09_154-358", "9.124.01.154", false},
        {"xantipa", "B01_001-358", "1.124.01.001", false},};
    private DefaultTableModel model = new DefaultTableModel(data, columnNames) {
        private static final long serialVersionUID = 1L;

        @Override
        public boolean isCellEditable(int row, int column) {
            switch (column) {
                case 3:
                    return true;
                default:
                    return false;
            }
        }

        @Override
        public Class getColumnClass(int column) {
            return getValueAt(0, column).getClass();
        }
    };

    public MyFrame() {
        tabs = new JTabbedPane();
        panel1 = new JPanel();
        runButton = new JButton("go!");
        runButton.addActionListener(new java.awt.event.ActionListener() {
            @Override
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                //
            }
        });
        panel1.add(runButton);
        tabs.addTab("first tab", panel1);
        JTable table = new JTable(model);
        JPanel buttonPanel = new JPanel();
        buttonPanel.add(new JButton("A button"));
        buttonPanel.add(new JLabel("Some description for the awesome table below "));
        buttonPanel.add(new JButton("another button"));
        JScrollPane tablePanel = new JScrollPane(table);
        JPanel container = new JPanel();
        container.setLayout(new BorderLayout());
        container.add(buttonPanel, BorderLayout.NORTH);
        container.add(tablePanel, BorderLayout.CENTER);
        tabs.addTab("Preview", container);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(tabs);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                MyFrame frame = new MyFrame();

            }
        });
    }
}

编辑2日。例如。

从代码（包括您关于将数据填充到模型的想法）

import java.awt.BorderLayout;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;

public class MyFrame extends JFrame {

    private JPanel panel1;
    private JTabbedPane tabs;
    private JButton runButton;
    private JFrame frame = new JFrame();
    private String[] columnNames = {"Nama", "Nim", "IP", "Hapus Baris ke"};
    private Object[][] data = {
        {"igor", "B01_125-358", "1.124.01.125", "true"},
        {"lenka", "B21_002-242", "21.124.01.002", "true"},
        {"peter", "B99_001-358", "99.124.01.001", "false"},
        {"zuza", "B12_100-242", "12.124.01.100", "true"},
        {"jozo", "BUS_011-358", "99.124.01.011", "false"},
        {"nora", "B09_154-358", "9.124.01.154", "false"},
        {"xantipa", "B01_001-358", "1.124.01.001", "false"},};
    private DefaultTableModel model = new DefaultTableModel(data, columnNames) {
        private static final long serialVersionUID = 1L;

        @Override
        public boolean isCellEditable(int row, int column) {
            switch (column) {
                case 3:
                    return true;
                default:
                    return false;
            }
        }

        @Override
        public Class getColumnClass(int column) {
            return getValueAt(0, column).getClass();
        }
    };

    public MyFrame() {
        tabs = new JTabbedPane();
        panel1 = new JPanel();
        runButton = new JButton("go!");
        runButton.addActionListener(new java.awt.event.ActionListener() {
            @Override
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                List<String[]> data = new LinkedList<String[]>();
                for (int i = 1; i < 10; i++) {
                    data.add(new String[]{"entry1", "value1", "value2", "value3"});
                }
                for (String[] datarow : data) {
                    model.addRow(Arrays.copyOf(datarow, datarow.length, Object[].class));
                }
            }
        });
        panel1.add(runButton);
        tabs.addTab("first tab", panel1);
        JTable table = new JTable(model);
        JPanel buttonPanel = new JPanel();
        buttonPanel.add(new JButton("A button"));
        buttonPanel.add(new JLabel("Some description for the awesome table below "));
        buttonPanel.add(new JButton("another button"));
        JScrollPane tablePanel = new JScrollPane(table);
        JPanel container = new JPanel();
        container.setLayout(new BorderLayout());
        container.add(buttonPanel, BorderLayout.NORTH);
        container.add(tablePanel, BorderLayout.CENTER);
        tabs.addTab("Preview", container);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(tabs);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                MyFrame frame = new MyFrame();

            }
        });
    }
}