问题

我正在创建一个NetBeans Java项目，该项目从Microsoft Access数据库中检索数据。我需要显示一个可编辑的复选框以代表其中一列，但出现了true/false的情况。在Design视图中，jTable显示复选框，但当我运行程序时，显示为true/false。我真的不理解编辑器和渲染器，尽管我已经尝试过，但如果没有这个问题的解决方法，最好。如果这是唯一的方法，请解释如何做到这一点。

这是我的GUI代码：

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package timetable;



/**
 *
 * @author Lenovo
 */
public class TaskFrame extends javax.swing.JFrame {

    /**
     * Creates new form Main
     */
    public TaskFrame() {
        initComponents();
        this.setLocationRelativeTo(null);

        taskList t = new taskList()
        jtblTodayTasks.setModel(t.filljtblTodayTasks());

    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jScrollPane1 = new javax.swing.JScrollPane();
        jtblTodayTasks = new javax.swing.JTable();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setBackground(new java.awt.Color(255, 255, 255));
        setMinimumSize(new java.awt.Dimension(1100, 619));
        setResizable(false);
        setSize(new java.awt.Dimension(1100, 619));
        getContentPane().setLayout(null);

        jtblTodayTasks.setFont(new java.awt.Font("Roboto", 0, 14)); // NOI18N
        jtblTodayTasks.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {
                {null, null, null, null, null},
                {null, null, null, null, null},
                {null, null, null, null, null},
                {null, null, null, null, null}
            },
            new String [] {
                "ID", "Task", "Subject", "Due Date", "Completed"
            }
        ) {
            Class[] types = new Class [] {
                java.lang.Integer.class, java.lang.Object.class, java.lang.Object.class, java.lang.Object.class, java.lang.Boolean.class
            };
            boolean[] canEdit = new boolean [] {
                false, false, false, false, true
            };

            public Class getColumnClass(int columnIndex) {
                return types [columnIndex];
            }

            public boolean isCellEditable(int rowIndex, int columnIndex) {
                return canEdit [columnIndex];
            }
        });
        jScrollPane1.setViewportView(jtblTodayTasks);
        if (jtblTodayTasks.getColumnModel().getColumnCount() > 0) {
            jtblTodayTasks.getColumnModel().getColumn(4).setPreferredWidth(0);
        }


        pack();
    }// </editor-fold>                            

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional)"> 
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        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(TaskFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(TaskFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(TaskFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(TaskFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        //</editor-fold>

        //</editor-fold>

        //</editor-fold>

        /* Create and display the form */


        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new TaskFrame().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTable jtblTodayTasks;
    private javax.swing.JTabbedPane tabbedPane;
    // End of variables declaration                   
}

这是我的taskList类：

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package timetable;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.Date;
import javax.swing.JOptionPane;
import javax.swing.table.DefaultTableModel;

/**
 *
 * @author Lenovo
 */
public class taskList {
    ArrayList<Task> taskArray = new ArrayList<>();

    public taskList(){
        ConnectDB db = new ConnectDB();
        ResultSet rs = db.getResults("SELECT * FROM tblTasks WHERE userID = " + Login.currentUserID + " ORDER BY dueDate;");

        try{
            while (rs.next()){
                Task task = new Task(rs.getInt("taskID"), rs.getInt("userID"), rs.getString("taskName"), rs.getString("Subject"), rs.getString("taskDetails"), rs.getString("dueDate"), rs.getBoolean("Completed"));
                taskArray.add(task);
            }
            rs.close();
        }catch (SQLException ex) {
        JOptionPane.showMessageDialog(null, "Database error. Please contact the system Administrator");
        }
    }

    public DefaultTableModel filljtblTodayTasks(){

        Object[] columnNames = {"ID", "Task", "Subject", "Due Date", "Completed"};
        DefaultTableModel model = new DefaultTableModel(columnNames, 0);

        for (int i = 0; i < taskArray.size(); i++) {
            model.addRow(new Object[]{taskArray.get(i).getTaskID(), taskArray.get(i).getTaskName(), taskArray.get(i).getSubject(), taskArray.get(i).getDueDate(), taskArray.get(i).isCompleted()});
        }
        return model;
    }
}

谢谢！

英文:

I am creating a netbeans java project that retrieves data from a microsoft access database.
I need to display an editable checkbox for one of my columns but for some reason it comes up as true/false instead. The jTable in the Design view shows checkboxes but when I run the program true/false is displayed.
I really don't understand editors and renders though I have tried, a solution without this would be preferable but if it is the only way, please explain how to do it.

Here is my GUI code:

/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package timetable;
/**
*
* @author Lenovo
*/
public class TaskFrame extends javax.swing.JFrame {
/**
* Creates new form Main
*/
public TaskFrame() {
initComponents();
this.setLocationRelativeTo(null);
taskList t = new taskList()
jtblTodayTasks.setModel(t.filljtblTodayTasks());
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings(&quot;unchecked&quot;)
// &lt;editor-fold defaultstate=&quot;collapsed&quot; desc=&quot;Generated Code&quot;&gt;                          
private void initComponents() {
jScrollPane1 = new javax.swing.JScrollPane();
jtblTodayTasks = new javax.swing.JTable();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setBackground(new java.awt.Color(255, 255, 255));
setMinimumSize(new java.awt.Dimension(1100, 619));
setResizable(false);
setSize(new java.awt.Dimension(1100, 619));
getContentPane().setLayout(null);
jtblTodayTasks.setFont(new java.awt.Font(&quot;Roboto&quot;, 0, 14)); // NOI18N
jtblTodayTasks.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null}
},
new String [] {
&quot;ID&quot;, &quot;Task&quot;, &quot;Subject&quot;, &quot;Due Date&quot;, &quot;Completed&quot;
}
) {
Class[] types = new Class [] {
java.lang.Integer.class, java.lang.Object.class, java.lang.Object.class, java.lang.Object.class, java.lang.Boolean.class
};
boolean[] canEdit = new boolean [] {
false, false, false, false, true
};
public Class getColumnClass(int columnIndex) {
return types [columnIndex];
}
public boolean isCellEditable(int rowIndex, int columnIndex) {
return canEdit [columnIndex];
}
});
jScrollPane1.setViewportView(jtblTodayTasks);
if (jtblTodayTasks.getColumnModel().getColumnCount() &gt; 0) {
jtblTodayTasks.getColumnModel().getColumn(4).setPreferredWidth(0);
}
pack();
}// &lt;/editor-fold&gt;                            
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//&lt;editor-fold defaultstate=&quot;collapsed&quot; desc=&quot; Look and feel setting code (optional) &quot;&gt;
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if (&quot;Nimbus&quot;.equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(TaskFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(TaskFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(TaskFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(TaskFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//&lt;/editor-fold&gt;
//&lt;/editor-fold&gt;
//&lt;/editor-fold&gt;
//&lt;/editor-fold&gt;
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new TaskFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTable jtblTodayTasks;
private javax.swing.JTabbedPane tabbedPane;
// End of variables declaration                   
}

Here is my taskList class:

/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package timetable;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.Date;
import javax.swing.JOptionPane;
import javax.swing.table.DefaultTableModel;
/**
*
* @author Lenovo
*/
public class taskList {
ArrayList&lt;Task&gt; taskArray = new ArrayList&lt;&gt;();
public taskList(){
ConnectDB db = new ConnectDB();
ResultSet rs = db.getResults(&quot;SELECT * FROM tblTasks WHERE userID = &quot; + Login.currentUserID + &quot; ORDER BY dueDate;&quot;);
try{
while (rs.next()){
Task task = new Task(rs.getInt(&quot;taskID&quot;), rs.getInt(&quot;userID&quot;), rs.getString(&quot;taskName&quot;), rs.getString(&quot;Subject&quot;), rs.getString(&quot;taskDetails&quot;), rs.getString(&quot;dueDate&quot;), rs.getBoolean(&quot;Completed&quot;));
taskArray.add(task);
}
rs.close();
}catch (SQLException ex) {
JOptionPane.showMessageDialog(null, &quot;Database error. Please contact the system Administrator&quot;);
}
}
public DefaultTableModel filljtblTodayTasks(){
Object[] columnNames = {&quot;ID&quot;, &quot;Task&quot;, &quot;Subject&quot;, &quot;Due Date&quot;, &quot;Completed&quot;};
DefaultTableModel model = new DefaultTableModel(columnNames, 0);
for (int i = 0; i &lt; taskArray.size(); i++) {
model.addRow(new Object[]{taskArray.get(i).getTaskID(), taskArray.get(i).getTaskName(), taskArray.get(i).getSubject(), taskArray.get(i).getDueDate(), taskArray.get(i).isCompleted()});
}
return model;
}

Thank you so much!

答案1

得分: 2

"The jTable in the Design view shows checkboxes but when I run the program true/false is displayed."
- "在设计视图中，jTable 显示复选框，但运行程序时显示 true/false。"
"The getColumnClass(...) method determines which renderer is used for each column."
- "getColumnClass(...) 方法确定每列使用哪个渲染器。"
"The code in your TaskFrame already creates a custom model and overrides the getColumnClass(...) method."
- "您的 TaskFrame 中的代码已经创建了自定义模型并重写了 getColumnClass(...) 方法。"
"But then you create another table model but are not overriding the getColumnClass(...) method:"
- "但然后您创建了另一个表模型，但没有重写 getColumnClass(...) 方法："
"Object[] columnNames = {"ID", "Task", "Subject", "Due Date", "Completed"};"
- "Object[] columnNames = {"ID", "Task", "Subject", "Due Date", "Completed"};"
"DefaultTableModel model = new DefaultTableModel(columnNames, 0);"
- "DefaultTableModel model = new DefaultTableModel(columnNames, 0);"
"Don't create a new DefaultTableModel."
- "不要创建新的 DefaultTableModel。"
"Instead you can just use:"
- "相反，您可以只使用："
"DefaultTableModel model = (DefaultTableModel)jtblTodayTasks.getModel();"
- "DefaultTableModel model = (DefaultTableModel)jtblTodayTasks.getModel();"
"model.setRowCount( 0 );"
- "model.setRowCount(0);"
"The above code will remove the data from the existing model, so you can add new data."
- "上述代码将从现有模型中删除数据，以便您可以添加新数据。"

英文:

> The jTable in the Design view shows checkboxes but when I run the program true/false is displayed.

The getColumnClass(...) method determines which renderer is used for each column

The code in your TaskFrame already creates a custom model and overrides the getColumnClass(...) method.

But then you create another table model but are not overriding the getColumnClass(...) method:

    Object[] columnNames = {&quot;ID&quot;, &quot;Task&quot;, &quot;Subject&quot;, &quot;Due Date&quot;, &quot;Completed&quot;};
DefaultTableModel model = new DefaultTableModel(columnNames, 0);

Don't create a new DefaultTableModel.

Instead you can just use:

DefaultTableModel model = (DefaultTableModel)jtblTodayTasks.getModel();
model.setRowCount( 0 );

The above code will remove the data from the existing model, so you can add new data.

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jTable布尔列显示为真/假而不是复选框。

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