The document provides a Java code example for creating a non-editable JTable using Swing. It includes components such as JFrame, JComboBox, JButton, and custom methods to manage user interaction, file handling, and displaying data. The key feature is the implementation of a method to make cells in the JTable non-editable by overriding the isCellEditable method.

1. How do I make my JTable non editable?
import java.awt.*;
import javax.swing.table.*;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableModel;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
import java.nio.*;
import java.nio.charset.Charset;
import java.nio.file.*;
import java.awt.Desktop;
import java.io.File;
import java.io.IOException;
import java.util.Scanner;
import java.util.StringTokenizer;
public class SwingDemo implements ActionListener, KeyListener
{
JLabel search, output;
JFrame viewer;
JTable table = new JTable(new DefaultTableModel(null, new Object []{"Row ID", "First
Name", "Last Name", "EMPLID", "GPA", "Venus Login"}));
JFrame viewerAdd;
DefaultTableModel model = (DefaultTableModel) table.getModel();
JTextField first = new JTextField(20);
JTextField last = new JTextField(20);
JTextField emplid = new JTextField(20);
JTextField gpa = new JTextField(20);
JTextField venus = new JTextField(10);
String Venus;
public static int rowCount = 1;
public final static int LOAD = 0;

2. public final static int SAVE = 1;
public SwingDemo()
{
//Creates Java Frame
viewer = new JFrame("Final Project");
viewer.setSize(570, 650);
viewer.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
viewer.setLayout(new FlowLayout());
viewer.setLocationRelativeTo(viewer);
//Creates Drop Down Menu
String[] option = { "Row ID", "First Name", "Last Name", "EMPLID", "GPA", "Venus
Login" };
JComboBox options = new JComboBox(option);
options.setSelectedIndex(0);
//Creates Button and Labels
search = new JLabel("Search by: ");
JButton addButton = new JButton("Add");
JButton deleteButton = new JButton("Delete");
JButton exportButton = new JButton("Export Data");
//Creates JTable
JTextField textBox = new JTextField(20);
table = new JTable(model);
JScrollPane scrollPane = new JScrollPane(table);
table.setFillsViewportHeight(true);
//Creates Menu Bar
JMenuBar menuBar = new JMenuBar();
JMenu fileMenu = new JMenu("File");
JMenu helpMenu = new JMenu("Help");
menuBar.add(fileMenu);
menuBar.add(helpMenu);

3. JMenuItem openAction = new JMenuItem("Open");
JMenuItem exitAction = new JMenuItem("Exit");
JMenuItem exportAction = new JMenuItem("Export");
JMenuItem aboutAction = new JMenuItem("About");
fileMenu.add(openAction);
fileMenu.add(exportAction);
fileMenu.add(exitAction);
helpMenu.add(aboutAction);
//fileChooser.setDialogTitle("Choose a file");
//ActionListener
openAction.addActionListener(this);
exitAction.addActionListener(this);
aboutAction.addActionListener(this);
addButton.addActionListener(this);
//Action Events
//Adds Elements to Java Frame
viewer.setJMenuBar(menuBar);
viewer.add(search);
viewer.add(options);
viewer.add(textBox);
viewer.add(addButton);
viewer.add(deleteButton);
viewer.add(scrollPane);
viewer.add(exportButton);
viewer.setVisible(true);
}
public void addUser()
{
JButton OK = new JButton("OK");
JButton CANCEL = new JButton("CANCEL");
//JTextField

4. //Strings
JLabel firstName = new JLabel("First Name");
JLabel lastName = new JLabel("Last Name");
JLabel EMPLID = new JLabel("EMPLID");
JLabel GPA = new JLabel("GPA");
JLabel venusLogin = new JLabel("Venus Login");
//ActionListener
first.addActionListener(this);
last.addActionListener(this);
emplid.addActionListener(this);
gpa.addActionListener(this);
first.addKeyListener(this);
last.addKeyListener(this);
emplid.addKeyListener(this);
viewerAdd = new JFrame("Add User");
viewerAdd.setSize(300, 200);
viewerAdd.setDefaultCloseOperation(viewerAdd.HIDE_ON_CLOSE);
viewerAdd.setLayout(new GridLayout(6,2));
viewerAdd.setLocationRelativeTo(viewerAdd);
viewerAdd.add(firstName);
viewerAdd.add(first);
viewerAdd.add(lastName);
viewerAdd.add(last);
viewerAdd.add(EMPLID);
viewerAdd.add(emplid);
viewerAdd.add(GPA);
viewerAdd.add(gpa);
viewerAdd.add(venusLogin);
viewerAdd.add(venus);
viewerAdd.add(OK);
viewerAdd.add(CANCEL);
OK.addActionListener(this);
CANCEL.addActionListener(this);

5. venus.setEditable(false);
viewerAdd.setVisible(true);
}
@Override
public void actionPerformed(ActionEvent e) throws NumberFormatException
{
switch(e.getActionCommand())
{
case "Exit":
System.exit(0);
break;
case "Open":
FileDialog fileChooser = new FileDialog(viewerAdd,"Select file",FileDialog.LOAD);
fileChooser.setVisible(true);
JFileChooser a = new JFileChooser(fileChooser.getFile());
File[] file;
file = fileChooser.getFiles();
if(fileChooser.getFile() != null)
{
try
{
BufferedReader br = new BufferedReader(new FileReader(file[0]));
String line;
while ((line = br.readLine()) != null)
{
StringTokenizer st = new StringTokenizer(line, "," +" ");
String f = st.nextToken();
String l = st.nextToken();
String em = st.nextToken();

6. String g = st.nextToken();
String v = st.nextToken();
model.addRow(new Object[]{rowCount++,f, l, em, g, v});
}
}
catch (FileNotFoundException ex)
{
System.out.println("o");
}
catch (IOException e1)
{
JOptionPane.showMessageDialog(fileChooser, "There was an IO Exception that was
caught. Error: "+ e1.getMessage(), null, JOptionPane.ERROR_MESSAGE);
e1.printStackTrace();
}
}
else
{
JOptionPane.showMessageDialog(null, "File Not Selected", null,
JOptionPane.ERROR_MESSAGE);
}
break;
case "About":
JOptionPane.showMessageDialog(viewer, "This is an App made by ");
break;
case "Add":
addUser();
break;
case "OK":
int userAction1 = JOptionPane.showConfirmDialog(null, "Are You Sure You Want To Insert
this Record?");
int number;
double number1;

7. boolean emp, ga = false;
if(userAction1 == JOptionPane.YES_OPTION)
{
String firstName = first.getText();
String lastName = last.getText();
String Emplid = emplid.getText();
String Gpa = gpa.getText();
if (firstName.length() < 2)
JOptionPane.showMessageDialog(null, "First Name must contain at least 2 characters",
null, JOptionPane.ERROR_MESSAGE);
else if (lastName.length() < 2)
JOptionPane.showMessageDialog(null, "Last Name must contain at least 2 characters",
null, JOptionPane.ERROR_MESSAGE);
else if (Emplid.length()!=8)
JOptionPane.showMessageDialog(null, "EMPLID must contain 8 numbers", null,
JOptionPane.ERROR_MESSAGE);
try
{
number = Integer.parseInt(Emplid);
try
{
number1 = Double.parseDouble(Gpa);
if(number1 < 0 || number1 > 4)
JOptionPane.showMessageDialog(null, "GPA must be between 0.0 - 4.0", null,
JOptionPane.ERROR_MESSAGE);
else
ga = true;
}
catch (Exception s)
{
JOptionPane.showMessageDialog(null, "GPA must be between 0.0 - 4.0", null,
JOptionPane.ERROR_MESSAGE);
}
}

8. catch (Exception s)
{
JOptionPane.showMessageDialog(null, "EMPLID must contain 8 numbers only", null,
JOptionPane.ERROR_MESSAGE);
}
if (ga == true)
{
model.addRow(new Object[]{rowCount++,firstName, lastName, Emplid, Gpa, Venus});
viewerAdd.setVisible(false);
first = new JTextField(20);
last = new JTextField(20);
emplid = new JTextField(20);
gpa = new JTextField(20);
venus = new JTextField(10);
}
}
break;
case "CANCEL":
viewerAdd.setVisible(false);
break;
}
}
@Override
public void keyTyped(KeyEvent e)
{
try
{
venus.setText(last.getText().substring(0,2)+first.getText().substring(0,2)+emplid.getText().sub
string(4,8));
}

9. catch(Exception s)
{
}
Venus = venus.getText();
}
@Override
public void keyPressed(KeyEvent e)
{
try
{
venus.setText(last.getText().substring(0,2)+first.getText().substring(0,2)+emplid.getText().sub
string(4,8));
}
catch(Exception s)
{
}
Venus = venus.getText();
}
@Override
public void keyReleased(KeyEvent e)
{
try
{
venus.setText(last.getText().substring(0,2)+first.getText().substring(0,2)+emplid.getText().sub
string(4,8));
}
catch(Exception s)
{
}
Venus = venus.getText();

10. }
}
Solution
step 1:Go to the Navigation Pane, expand JScrollPane option
step 2:In JSCROLLPne, right-click on JTable and Select Customize Code as shown below:
step 3:On the code customizer option, choose custom property in the second drop down
step 4: Insert the code written below ,before the last bracket);code is given below
step5:{public boolean isCellEditable(int row, int column){return false;}}