JTable中列内的java Jcheckbox

Question

我想创建一个表，在该表中，每次添加新行时，也会在特定列中添加一个新复选框。我已经完成了我的研究，但我仍然找不到正确的答案，有时我发现很难理解其中的一些说明 这就是我的问题：

我在表格的列（“e”）中添加了一个复选框，但没有显示。该复选框仅在我单击时显示

package app.ui;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JLabel;
import java.awt.Font;
import java.awt.event.KeyEvent;
import java.util.List;

import javax.swing.JTable;
import javax.swing.JScrollPane;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableColumn;
import javax.swing.DefaultCellEditor;
import javax.swing.JTextField;
import javax.swing.JCheckBox;
import javax.swing.SwingConstants;

import app.dao.item.impl.ReadItemFromDB;
import app.model.Item;

public class Inventory {

private JFrame inventoryframe;
private JTable table;
private JTextField textField;
private JCheckBox checkbox;
/**
 * Launch the application.
 */
public  void InventoryWindow() {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                Inventory window = new Inventory();
                window.inventoryframe.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

/**
 * Create the application.
 */
public Inventory() {
    initialize();

}

/**
 * Initialize the contents of the frame.
 */
private void initialize() {
    inventoryframe = new JFrame();
    inventoryframe.setExtendedState(JFrame.MAXIMIZED_BOTH);
    inventoryframe.getContentPane().setBackground(new Color(153, 204, 102));
    inventoryframe.getContentPane().setForeground(new Color(255, 255, 255));
    inventoryframe.getContentPane().setPreferredSize(new Dimension(1365, 747));
    inventoryframe.pack();
    inventoryframe.getContentPane().setLayout(null);

    JLabel lblInventory = new JLabel("Inventory Management");
    lblInventory.setBounds(56, 32, 234, 27);
    lblInventory.setFont(new Font("Tahoma", Font.PLAIN, 22));
    inventoryframe.getContentPane().add(lblInventory);

    JScrollPane scrollPane = new JScrollPane();
    scrollPane.setBounds(56, 130, 479, 249);
    inventoryframe.getContentPane().add(scrollPane);

    table = new JTable();
    table.setShowVerticalLines(false);
    table.setShowHorizontalLines(false);
    table.setShowGrid(false);
    table.setFillsViewportHeight(true);
    table.setModel(new DefaultTableModel(
            new Object[][] {
            },
            new String[] {
                    "t", "e"
            }
            ));
    scrollPane.setViewportView(table);


    checkbox = new JCheckBox("borrow");
    checkbox.setHorizontalAlignment(SwingConstants.CENTER);
    checkbox.setBounds(360, 63, 97, 23);

    TableColumn sportColumn = table.getColumnModel().getColumn(1);
    sportColumn.setCellEditor(new DefaultCellEditor(checkbox));


    doIt();
}

public void doIt(){
    DefaultTableModel dtm = (DefaultTableModel) table.getModel();
    dtm.getDataVector().removeAllElements();
    dtm.getColumnClass(0);
    ReadItemFromDB myReader = new ReadItemFromDB();
    List<Item> newItemList = myReader.showItems();
    @Override
     public Class getColumnClass() {
            return getValueAt(0, 1).getClass();
        }
    for (Item myNewItems : newItemList) {
        Object[] rowData = new Object[1];


        rowData[0] =myNewItems.getItemID();



        dtm.addRow(rowData);
    }

    table.updateUI();


}



/*public Boolean getColumnClass(){
    dtm.getValueAt(0, 1).getClass();
    return null;

}*/

}

Answer 1

"Im sorry , please elaborate more?? Can u show an example?"

不需要自定义渲染器或编辑器。只需@Override在表的模型中getColumnClass()使用DefaultTableModel并对该列使用Boolean类型

下面是一个运行示例，这里是重要的部分

    DefaultTableModel model = new DefaultTableModel(data, cols) {
        @Override
        public Class getColumnClass(int column) {
            return getValueAt(0, column).getClass();
        }
    };
    JTable table = new JTable(model);

这是完整的代码

import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;

public class TestTableCheck {

    private static JTable createTable() {
        Object[][] data = {{true, true, true}, {false, false, false}};
        String[] cols = {"Bibitty", "Boppity", "Boo"};

        DefaultTableModel model = new DefaultTableModel(data, cols) {
            @Override
            public Class getColumnClass(int column) {
                return getValueAt(0, column).getClass();
            }
        };
        JTable table = new JTable(model);

        return table;
    }

    public static void main(String[] args) {
        JOptionPane.showMessageDialog(null,
                new JScrollPane(createTable()),
                "Table",
                JOptionPane.PLAIN_MESSAGE);
    }
}

---

更新

这是你的密码。查看initialize()方法，我在其中注释了您的一些代码，并在下面添加了我的代码。我还去掉了doit()方法。此外，还应该pack()作为方法的结尾，并且setVisible()。我还添加了一个main方法，因此它是可运行的

import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JLabel;
import java.awt.Font;

import javax.swing.JTable;
import javax.swing.JScrollPane;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumn;
import javax.swing.DefaultCellEditor;
import javax.swing.JTextField;
import javax.swing.JCheckBox;
import javax.swing.SwingConstants;

import javax.swing.SwingUtilities;

public class Inventory {

    private JFrame inventoryframe;
    private JTable table;
    private JTextField textField;
    private JCheckBox checkbox;

    /**
     * Launch the application.
     */
    public void InventoryWindow() {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    Inventory window = new Inventory();
                    window.inventoryframe.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public Inventory() {
        initialize();

    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {
        inventoryframe = new JFrame();
        inventoryframe.setExtendedState(JFrame.MAXIMIZED_BOTH);
        inventoryframe.getContentPane().setBackground(new Color(153, 204, 102));
        inventoryframe.getContentPane().setForeground(new Color(255, 255, 255));
        inventoryframe.getContentPane().setPreferredSize(new Dimension(1365, 747));
        inventoryframe.getContentPane().setLayout(null);

        JLabel lblInventory = new JLabel("Inventory Management");
        lblInventory.setBounds(56, 32, 234, 27);
        lblInventory.setFont(new Font("Tahoma", Font.PLAIN, 22));
        inventoryframe.getContentPane().add(lblInventory);

        JScrollPane scrollPane = new JScrollPane();
        scrollPane.setBounds(56, 130, 479, 249);
        inventoryframe.getContentPane().add(scrollPane);

        table = new JTable();
        table.setShowVerticalLines(false);
        table.setShowHorizontalLines(false);
        table.setShowGrid(false);
        table.setFillsViewportHeight(true);
        /* table.setModel(new DefaultTableModel(
         new Object[][]{},
         new String[]{
         "t", "e"
         }
         ));*/
        Object[][] data = {{true, true, true}, {false, false, false}};
        String[] cols = {"Bibitty", "Boppity", "Boo"};

        DefaultTableModel model = new DefaultTableModel(data, cols) {
            @Override
            public Class getColumnClass(int column) {
                return getValueAt(0, column).getClass();
            }
        };
        table.setModel(model);
        scrollPane.setViewportView(table);

        checkbox = new JCheckBox("borrow");
        checkbox.setHorizontalAlignment(SwingConstants.CENTER);
        checkbox.setBounds(360, 63, 97, 23);

        TableColumn sportColumn = table.getColumnModel().getColumn(1);
        sportColumn.setCellEditor(new DefaultCellEditor(checkbox));

       inventoryframe.pack();
       inventoryframe.setVisible(true);
    }

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

---

更新2

真的，这应该是一个完全不同的问题，但我今天感觉很慷慨

使用这个测试类。运行它。当你点击按钮时，它会打开Inventory类。您可能没有在按钮的actionPerformed中实例化Inventory。确保该类文件与Inventory类文件位于同一个包中。只需运行下面的类

import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

public class InventoryTest extends JFrame {

    public InventoryTest() {
        setLayout(new GridBagLayout());
        JButton show = new JButton("Show Inventory");
        add(show);

        show.addActionListener(new ActionListener(){
            @Override
            public void actionPerformed(ActionEvent e) {
                new Inventory();
            }
        });

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(400, 400);
        setLocationRelativeTo(null);
        setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new InventoryTest();

            }
        });
    }
}