Question

首先，我为我的英语疏忽而道歉，我将解释我的所有问题。

首先，我想在JTable中使用JCheckBox。

我正在从索引0和1列中的数据库中检索学生ID和学生姓名。我希望第三列应该是缺席/现在，这将最初取决于学生是否在JCheckbox Value存在或缺席。

这是我的JTable值代码：

Attendance.java

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package shreesai;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Vector;

/**
 *
 * @author Admin
 */
public class Attendance{

    Connection con = Connectdatabase.ConnecrDb();
    public Vector getEmployee()throws Exception
    {

        Vector<Vector<String>> employeeVector = new Vector<Vector<String>>();

        PreparedStatement pre = con.prepareStatement("select studentid,name from student");
        ResultSet rs = pre.executeQuery();
        while(rs.next())
        {

            Vector<String> employee = new Vector<String>();
            employee.add(rs.getString(1)); //Empid
            employee.add(rs.getString(2));//name
            employeeVector.add(employee);

        }        
        if(con!=null)
        con.close();
        rs.close();
        pre.close();

        return employeeVector;
    }
}

这个从数据库中获取价值的代码将其保存到矢量

AttendanceGUI.java

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package shreesai;

import static java.awt.Frame.MAXIMIZED_BOTH;
import java.util.Vector;
import javax.swing.JOptionPane;

/**
 *
 * @author Admin
 */
public class AttendanceGUI extends javax.swing.JFrame {

    /**
     * Creates new form AttendanceGUI
     */
    private Vector<Vector<String>> data;
    private Vector<String> header;
    public AttendanceGUI() throws Exception {

        this.setLocationRelativeTo(null);
        setExtendedState(MAXIMIZED_BOTH);
        Attendance att = new Attendance();
        data = att.getEmployee();

        header = new Vector<String>();
        header.add("Student ID");
        header.add("Student Name");
        header.add("Absent/Present");
        initComponents();
    }
    /**
     * 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();
        AttendanceT = new javax.swing.JTable();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        AttendanceT.setModel(new javax.swing.table.DefaultTableModel(
            data,header
        ));
        jScrollPane1.setViewportView(AttendanceT);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(397, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(89, Short.MAX_VALUE))
        );

        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(AttendanceGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(AttendanceGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(AttendanceGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(AttendanceGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                try{
                    new AttendanceGUI().setVisible(true);
                }
                catch(Exception e){
                    JOptionPane.showMessageDialog(null,e);
                }
            }
        });
    }
    // Variables declaration - do not modify                     
    private javax.swing.JTable AttendanceT;
    private javax.swing.JScrollPane jScrollPane1;
    // End of variables declaration                   
}

我的问题是，我无法在每个学生面前添加JCheckBox JTabel模型，渲染器以及所有但我没有得到任何东西。我想要这样的东西......

enter image description here

我已经搜索了这个东西几个星期但是机器人得到了适合这个的东西

Answer 1

从How to use tables开始。

你的桌面模型需要几件事。

需要从适当列的Boolean.class方法返回getColumnClass。您需要覆盖此方法。
方法isCellEditable需要为要编辑的表格列返回true（因此用户可以更改列的值）
您的桌面模型需要能够保存列的值
确保为该行的boolean列传递有效值，否则将为null

更新了简单示例

enter image description here

import java.awt.EventQueue;
import java.util.Vector;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.DefaultTableModel;

public class TableTest {

  public static void main(String[] args) {
    new TableTest();
  }

  public TableTest() {
    startUI();
  }

  public void startUI() {
    EventQueue.invokeLater(new Runnable() {
      @Override
      public void run() {
        try {
          UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
          ex.printStackTrace();
        }

        MyTableModel model = new MyTableModel();
        model.addRow(new Object[]{0, "Brian", false});
        model.addRow(new Object[]{1, "Ned", false});
        model.addRow(new Object[]{2, "John", false});
        model.addRow(new Object[]{3, "Drogo", false});
        JTable table = new JTable(model);

        JFrame frame = new JFrame("Testing");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new JScrollPane(table));
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
      }
    });
  }

  public class MyTableModel extends DefaultTableModel {

    public MyTableModel() {
      super(new String[]{"ID", "Name", "Present"}, 0);
    }

    @Override
    public Class<?> getColumnClass(int columnIndex) {
      Class clazz = String.class;
      switch (columnIndex) {
        case 0:
          clazz = Integer.class;
          break;
        case 2:
          clazz = Boolean.class;
          break;
      }
      return clazz;
    }

    @Override
    public boolean isCellEditable(int row, int column) {
      return column == 2;
    }

    @Override
    public void setValueAt(Object aValue, int row, int column) {
      if (aValue instanceof Boolean && column == 2) {
        System.out.println(aValue);
        Vector rowData = (Vector)getDataVector().get(row);
        rowData.set(2, (boolean)aValue);
        fireTableCellUpdated(row, column);
      }
    }

  }

}

Ps-我强烈建议您避免使用表单编辑器，直到您更好地了解Swing的工作方式 - 恕我直言

Answer 2

如果您将Boolean值作为数据添加到表模型中，DefaultCellRendered会将其自身呈现为checbox，那么问题出在哪里？

如何在JTable中添加JCheckBox？

2 个答案: