Java 如何在 JTable 中添加 JCheckBox？

How to add JCheckBox in JTable?

提问by JavaTweaker

First of all i apologize for my english neglect that i will explain all my problem.

首先，我为我的英语疏忽道歉，我会解释我所有的问题。

First i want JCheckBox in the JTable i have.

首先我想要 JCheckBox 在我拥有的 JTable 中。

I am retrieving student id and student name from database in column index 0 and 1. I want third column should be Absent/Present which will initially take whether student is present or absent by JCheckbox Value.

我正在从数据库中的列索引 0 和 1 中检索学生 ID 和学生姓名。我希望第三列应该是缺席/存在，这将首先通过 JCheckbox 值判断学生是否存在或缺席。

Here my code for JTable values :

这是我的 JTable 值代码：

Attendance.java

考勤.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;
    }
}

THIS CODE FOR TAKING VALUES FROM DATABASE SAVING IT INTO VECTOR

此代码用于从数据库中获取值并将其保存为向量

AttendanceGUI.java

考勤GUI.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                   
}

My problemis that I can't add a JCheckBoxin front of every student I have seen JTabelmodel, renderer and all but I don't get anything. I want something like this...

我的问题是我不能JCheckBox在我见过的每个学生面前添加一个JTabel模型，渲染器等等，但我什么也没得到。我想要这样的东西...

I've search for this stuff for a couple of weeks but did bot get anything suitable for this

我已经搜索了这些东西几个星期了，但是机器人有没有得到任何适合这个的东西

采纳答案by MadProgrammer

Start with How to use tables.

从如何使用表格开始。

Your table model needs several things.

您的表模型需要一些东西。

1. It needs to return Boolean.classfrom the getColumnClassmethod for the appropriate column. You will need to override this method.
2. The method isCellEditablewill need to return truefor the table column you want to make editable (so the user can change the value of the column)
3. You're table model will need to be capable of holding the value for the column
4. Make sure you pass a valid value for the booleancolumn for the row, otherwise it will be null

1. 它需要Boolean.class从getColumnClass相应列的方法返回。您将需要覆盖此方法。
2. 该方法isCellEditable将需要返回true要使其可编辑的表列（以便用户可以更改列的值）
3. 您的表模型需要能够保存该列的值
4. 确保boolean为行的列传递一个有效值，否则它将是null

Updated with simple example

更新了简单的例子

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- I would HIGHLY recommend you avoid form editors until you have a better understanding of how Swing works - IMHO

Ps-我强烈建议您避免使用表单编辑器，直到您对 Swing 的工作原理有了更好的了解 - 恕我直言

回答by Antoniossss

Well if you add Booleanvalue as data into the table model, DefaultCellRenderedwill render it as checbox by itself, so where is the problem?

那么如果你将Booleanvalue作为数据添加到table模型中，DefaultCellRendered会自己渲染成checkbox，那么问题出在哪里呢？