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how do i make a button that sorts my list in an ascending order(java swing)?

I have created a an jtable in java swing which looks like the following
I have added 6 buttons and 3 of them work fine(add,update,delete). im not worried about random match button but i want "Sort By goals" button to sort out all the records entered by the highest number of goals. same goes for points. I have tried many times but i dont seem to be able to figure out.
Here is the code for my table arrays;
// create JFrame and JTable
JFrame frame = new JFrame();
JTable table = new JTable();
Container c = frame.getContentPane();
c.setLayout(new BoxLayout(c, BoxLayout.Y_AXIS));
c.add(table);
// create a table model and set a Column Identifiers to this model
Object[] columns = {"Team name", "Wins", "Losses", "Goals Difference","Points","Matches played"};
DefaultTableModel model = new DefaultTableModel();
model.setColumnIdentifiers(columns);
// set the model to the table
table.setModel(model);
// Change A JTable Background Color, Font Size, Font Color, Row Height
table.setBackground(Color.LIGHT_GRAY);
table.setForeground(Color.black);
Font font = new Font("", 1, 22);
table.setFont(font);
table.setRowHeight(30);
// table.setVisible(true);
Here is my draft for the button;
btnSortPoints.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
}
});
Here is my delete button;
btnDelete.addActionListener(new ActionListener(){
#Override
public void actionPerformed(ActionEvent e) {
// i = the index of the selected row
int i = table.getSelectedRow();
if(i >= 0){
// remove a row from jtable
model.removeRow(i);
}
else{
System.out.println("Delete Error");
}
}
});
Here is my entire code;
public class table{
public static void main(String[] args) {
// create JFrame and JTable
JFrame frame = new JFrame();
JTable table = new JTable();
Container c = frame.getContentPane();
c.setLayout(new BoxLayout(c, BoxLayout.Y_AXIS));
c.add(table);
// create a table model and set a Column Identifiers to this model
Object[] columns = {"Team name", "Wins", "Losses", "Goals Difference","Points","Matches played"};
DefaultTableModel model = new DefaultTableModel();
model.setColumnIdentifiers(columns);
// set the model to the table
table.setModel(model);
// Change A JTable Background Color, Font Size, Font Color, Row Height
table.setBackground(Color.LIGHT_GRAY);
table.setForeground(Color.black);
Font font = new Font("", 1, 22);
table.setFont(font);
table.setRowHeight(30);
// table.setVisible(true);
// create JTextFields
JTextField txtTeamName = new JTextField();
JTextField txtWins = new JTextField();
JTextField txtLosses = new JTextField();
JTextField txtGD = new JTextField();
JTextField txtPoints = new JTextField();
JTextField txtMatches = new JTextField();
JLabel lblTeamName = new JLabel("Team name");
JLabel lblWins = new JLabel("Wins");
JLabel lblLosses = new JLabel("Losses");
JLabel lblGD = new JLabel("Goal difference");
JLabel lblPoints = new JLabel("Points");
JLabel lblMatches = new JLabel("Matches");
// create JButtons
JButton btnAdd = new JButton("Add");
JButton btnDelete = new JButton("Delete");
JButton btnUpdate = new JButton("Update");
JButton btnSortPoints = new JButton("Sort by points");
JButton btnSortGoals = new JButton("Sort by goals");
JButton btnRandomMatch = new JButton("Add a random data");
txtTeamName.setBounds(1200, 230, 100, 25);
txtWins.setBounds(1200, 260, 100, 25);
txtLosses.setBounds(1200, 290, 100, 25);
txtGD.setBounds(1200, 320, 100, 25);
txtMatches.setBounds(1200,350,100,25);
txtPoints.setBounds(1200,380,100,25);
lblTeamName.setBounds(1100,230,100,25);
lblWins.setBounds(1100,260,100,25);
lblLosses.setBounds(1100,290,100,25);
lblGD.setBounds(1100,320,100,25);
lblMatches.setBounds(1100,350,100,25);
lblPoints.setBounds(1100,380,100,25);
btnAdd.setBounds(1150, 20, 200, 50);
btnUpdate.setBounds(1150, 80, 200, 50);
btnDelete.setBounds(1150, 140, 200, 50);
btnSortGoals.setBounds(920,20,200,50);
btnSortPoints.setBounds(920,80,200,50);
btnRandomMatch.setBounds(920,140,200,50);
// create JScrollPane
JScrollPane pane = new JScrollPane(table);
pane.setBounds(0, 0, 880, 400);
frame.setLayout(null);
frame.add(pane);
// add JTextFields to the jframe
frame.add(txtTeamName);
frame.add(txtWins);
frame.add(txtLosses);
frame.add(txtGD);
frame.add(txtMatches);
frame.add(txtPoints);
//Adding the labels to the frame
frame.add(lblTeamName);
frame.add(lblWins);
frame.add(lblLosses);
frame.add(lblGD);
frame.add(lblMatches);
frame.add(lblPoints);
// add JButtons to the jframe
frame.add(btnAdd);
frame.add(btnDelete);
frame.add(btnUpdate);
frame.add(btnSortGoals);
frame.add(btnSortPoints);
frame.add(btnRandomMatch);
// create an array of objects to set the row data
Object[] row = new Object[6];
// button add row
btnAdd.addActionListener(new ActionListener(){
#Override
public void actionPerformed(ActionEvent e) {
row[0] = txtTeamName.getText();
row[1] = txtWins.getText();
row[2] = txtLosses.getText();
row[3] = txtGD.getText();
row[4] = txtMatches.getText();
row[5] = txtPoints.getText();
// add row to the model
model.addRow(row);
}
});
// Event listener for button remove row
btnDelete.addActionListener(new ActionListener(){
#Override
public void actionPerformed(ActionEvent e) {
// i = the index of the selected row
int i = table.getSelectedRow();
if(i >= 0){
// remove a row from jtable
model.removeRow(i);
}
else{
System.out.println("Delete Error");
}
}
});
// get selected row data From table to textfields
table.addMouseListener(new MouseAdapter(){
#Override
public void mouseClicked(MouseEvent e){
// i = the index of the selected row
int i = table.getSelectedRow();
txtTeamName.setText(model.getValueAt(i, 0).toString());
txtWins.setText(model.getValueAt(i, 1).toString());
txtLosses.setText(model.getValueAt(i, 2).toString());
txtGD.setText(model.getValueAt(i, 3).toString());
txtMatches.setText(model.getValueAt(i,4).toString());
txtPoints.setText(model.getValueAt(i,5).toString());
}
});
// button update row
btnUpdate.addActionListener(new ActionListener(){
#Override
public void actionPerformed (ActionEvent e) {
// i = the index of the selected row
int i = table.getSelectedRow();
if(i >= 0)
{
model.setValueAt(txtTeamName.getText(), i, 0);
model.setValueAt(txtWins.getText(), i, 1);
model.setValueAt(txtLosses.getText(), i, 2);
model.setValueAt(txtGD.getText(), i, 3);
model.setValueAt(txtMatches.getText(),i,4);
model.setValueAt(txtPoints.getText(),i,5);
}
else{
System.out.println("Update Error");
}
}
});
btnSortPoints.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
}
});
frame.setSize(1400, 500);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}

You first need to add sorting support to your JTable. Read the Sorting and Filtering link from the tutorial for information on how to do that.
Once that is done the user will be able to sort any column by clicking on the column header of the column.
Verify the sorting works by manually clicking on the columns headers.
i want "Sort By goals" button to sort out all the records entered by the highest number of goals and points
Now that your JTable supports sorting you can add add an ActionListener to your buttons to do the specific sorting:
btnSortPoints.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
// Points column in the model is converted to the view column
int viewColumn = table.convertColumnIndexToView(4);
// Set up the columns you want to sort on
List<RowSorter.SortKey> sortKeys = new ArrayList<>();
sortKeys.add(new RowSorter.SortKey(viewColumn, SortOrder.ASCENDING));
// Do the sorting
TableRowSorter sorter = (TableRowSorter)table.getRowSorter();
sorter.setSortKeys(sortKeys);
}
});
`

Error while trying to add rows to JTable

I'm trying to add rows to my table whenever the user selects yes when they are asked to add the product to the cart or not with the help of JOptionPane Confirm Dialog. My code is as follows:
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
public class Home {
final static int WINDOW_WIDTH = 500;
final static int WINDOW_HEIGHT = 200;
JFrame window;
public Home() {
window = new JFrame();
window.setTitle("Home");
window.setSize(WINDOW_WIDTH, WINDOW_HEIGHT);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JLabel title = new JLabel("Please select a book for more information", JLabel.CENTER);
title.setHorizontalTextPosition(JLabel.CENTER);
Font plainFont = new Font("Serif", 0, 24);
title.setFont(plainFont);
title.setBounds(180, 230, 97, 29);
//====================================================================//
String [] bookStrings = {"[Select a book]", "The Host", "Ruby", "Divergent", "The Secret Garden", "Hunger Games"};
JComboBox bookList = new JComboBox(bookStrings);
//====================================================================//
JLabel bookinfo = new JLabel();
//====================================================================//
JButton search = new JButton("Search");
search.setHorizontalTextPosition(JButton.CENTER);
JButton cart = new JButton("Show Cart");
search.setHorizontalTextPosition(JButton.CENTER);
JButton exit = new JButton("Exit");
search.setHorizontalTextPosition(JButton.CENTER);
JTable cartTable;
String[] columns = {"Book Name","Author", "Quantity", "Price"};
String [][] data = {};
cartTable = new JTable(data, columns);
cartTable.setPreferredScrollableViewportSize(new Dimension(450, 63));
cartTable.setFillsViewportHeight(true);
JScrollPane jps = new JScrollPane(cartTable);
//====================================================================//
search.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
if (bookList.getSelectedIndex() == 1) {
int reply = JOptionPane.showConfirmDialog(null,
"<html>Title: The Host <br> Author: Stephenie Meyer <br> Price: 110 AED <br> " +
"\n Synopsis: The Host is a romance novel by Stephenie Meyer. The book is about Earth, " +
"\n in a post apocalyptic time, being invaded by a parasitic alien race, known as \"Souls\", and " +
"\n follows one Soul's predicament when the consciousness of her human host refuses to co-operate " +
"\n with the takeover of her body."
+ "\n \n Would you like to add this to cart?", "Book Details", JOptionPane.YES_NO_OPTION);
if (reply == JOptionPane.YES_OPTION){
String [][] data = {{"The Host", "Stephenie Meyer", "2", "110"}};
DefaultTableModel model = (DefaultTableModel)(cartTable.getModel());
model.addRow(data);
}
else {
JOptionPane.showMessageDialog(null, "GOODBYE");
}
}
});
cart.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
new Cart();
window.setVisible(false);
}
});
exit.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
//====================================================================//
JPanel panel;
panel = new JPanel();
panel.add(title);
panel.add(bookList);
panel.add(search);
panel.add(bookinfo);
panel.add(cart);
panel.add(exit);
panel.add(jps);
window.add(panel);
window.setVisible(true);
}
}
However I'm getting this error:
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: javax.swing.JTable$1 cannot be cast to javax.swing.table.DefaultTableModel
Can someone help me with where I'm going wrong? Thank You.

cartTable = new JTable(data, columns);
uses an anonymous AbstractTableModel if I remember correctly.
Use instead:
cartTable = new JTable(new DefaultTableModel(data, columns));
DefaultTableModel fires miscellaneous change events and handles dynamic data.

Tried to add data to the JTable Dynamically using DefaultTableModel but it is not working

I tried to add data to the JTable Dynamically using DefaultTableModel, but it isn't working.
I had created two classes: One class (Input.java) represents a popup which allows you to write the data (name, option and constraint) and save it. Another class represents a popup which includes a table (InputMain.java). InputMain will then transform those info (if received) to a row with in the table that list out those all the information in three columns. In Input, I created an instance of InputMain, and set the model of the table to a new DefaultTableModel() (if I don't do this, it will throw an error) (a table is already created in InputMain, so that if I create an instance of InputMain, I am probably calling the table within InputMain). Then, according to actionPerformed(ActionEvent e), after the 'enter' button is clicked within the JPanel, it will create a new array of data with nameText, optionText and constraintText. And finally, the data will be added to the model.
I don't know why I can't add all those data into the table, except that method above sounds logical to me.
Here's the InputMain.java class:
package com.company;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
/**
* Created by paull on 14/5/2016.
*/
public class InputMain {
JButton add;
JButton change;
JButton delete;
JTable table;
String[] columns;
String[][] data;
JButton create;
JPanel labelPanel;
JPanel bigPanel;
JPanel centerPanel;
public InputMain() {
int fontSize = 50;
add = new JButton("add");
change = new JButton("change");
delete = new JButton("delete");
create = new JButton("create");
columns = new String[]{"name","option","constraint"};
data = new String[][]{{"","",""}};
table = new JTable(data,columns) {
#Override
public boolean isCellEditable(int row, int column) {
return false; //to avoid it from being changable by double clicking any data
}
};
table.setPreferredScrollableViewportSize(new Dimension(450,63));
table.setFillsViewportHeight(true);
JScrollPane jsp = new JScrollPane(table); // not always can the table be fully shown --> add a scrollbar
add.setFont(new Font(add.getName(),Font.PLAIN,fontSize));
change.setFont(new Font(add.getName(),Font.PLAIN,fontSize));
delete.setFont(new Font(add.getName(),Font.PLAIN,fontSize));
create.setFont(new Font(add.getName(),Font.PLAIN,fontSize));
table.setFont(new Font(table.getName(),Font.PLAIN,fontSize));
//table.getEditorComponent().setFont(new Font(add.getName(),Font.PLAIN,fontSize));
table.getTableHeader().setFont(new Font(table.getName(),Font.PLAIN,fontSize));
labelPanel = new JPanel();
labelPanel.add(add);
labelPanel.add(change);
labelPanel.add(delete);
labelPanel.setLayout(new FlowLayout(10,30,10));
centerPanel = new JPanel();
centerPanel.add(labelPanel);
centerPanel.setLayout(new GridBagLayout());
bigPanel = new JPanel();
bigPanel.setLayout(new GridLayout(3,0));
bigPanel.add(centerPanel);
bigPanel.add(jsp);
bigPanel.add(create);
add.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
InputFrame s = new InputFrame();
Input i = new Input();
s.add(i.labelPanel);
s.setVisible(true);
}
}); // pressing add button pops up the Input Frame
}
}
And here's the Input.java class:
package com.company;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
/**
* Created by paull on 14/5/2016.
*/
public class Input extends JPanel{
JLabel nameLabel;
JLabel optionLabel;
JLabel constraintLabel;
JButton enter;
JPanel labelPanel;
JPanel jp2;
JPanel jp3;
JPanel jp4;
JTextField nameText;
String[] optionStrings;
JComboBox<String> optionText;
JCheckBox wk1;
JCheckBox wk2;
JCheckBox wk3;
JCheckBox wk4;
JCheckBox wk5;
public Input() {
nameLabel = new JLabel("name: ");
optionLabel = new JLabel("option: ");
constraintLabel = new JLabel("constraint:");
enter = new JButton("add");
nameText = new JTextField(10);
Options c = new Options();
optionStrings = new String[]{c.satNight,c.sunEight,c.sunNineThirty,c.sunEleven,c.sunNight};
optionText = new JComboBox<String>(optionStrings);
wk1 = new JCheckBox("1");
wk2 = new JCheckBox("2");
wk3 = new JCheckBox("3");
wk4 = new JCheckBox("4");
wk5 = new JCheckBox("5");
int fontSize = 50;
nameLabel.setFont(new Font(nameLabel.getName(),Font.PLAIN,fontSize));
optionLabel.setFont(new Font(nameLabel.getName(),Font.PLAIN,fontSize));
constraintLabel.setFont(new Font(nameLabel.getName(),Font.PLAIN,fontSize));
enter.setFont(new Font(nameLabel.getName(),Font.PLAIN,fontSize));
nameText.setFont(new Font(nameLabel.getName(),Font.PLAIN,fontSize));
optionText.setFont(new Font(nameLabel.getName(),Font.PLAIN,fontSize));
wk1.setFont(new Font(nameLabel.getName(),Font.PLAIN,fontSize));
wk2.setFont(new Font(nameLabel.getName(),Font.PLAIN,fontSize));
wk3.setFont(new Font(nameLabel.getName(),Font.PLAIN,fontSize));
wk4.setFont(new Font(nameLabel.getName(),Font.PLAIN,fontSize));
wk5.setFont(new Font(nameLabel.getName(),Font.PLAIN,fontSize));
labelPanel = new JPanel();
labelPanel.add(nameLabel);
labelPanel.add(nameText);
labelPanel.add(optionLabel);
labelPanel.add(optionText);
labelPanel.add(constraintLabel);
labelPanel.add(wk1);
labelPanel.add(wk2);
labelPanel.add(wk3);
labelPanel.add(wk4);
labelPanel.add(wk5);
labelPanel.add(enter);
labelPanel.setLayout(new FlowLayout(10,30,10));
InputMain i = new InputMain();
i.table.setModel(new DefaultTableModel());
DefaultTableModel model = (DefaultTableModel) i.table.getModel();
enter.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
String constraintText = "";
String[] data = new String[]{nameText.getText(),optionText.getSelectedItem().toString(),constraintText};
model.addRow(data);
nameText.setText("");
}
});
}
}
Thanks in advance.

I think the problem lies in the actionPerformed of InputMain.
add.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
InputFrame s = new InputFrame();
Input i = new Input();
s.add(i.labelPanel);
s.setVisible(true);
}
});
You construct a new instance of Input. That means that you create a new empty DefaultTableModel and attach it to your table each time you click on the add button. Try move the construction of the Input outside of your actionPerformed like this:
Input i = new Input();
add.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
InputFrame s = new InputFrame();
s.add(i.labelPanel);
s.setVisible(true);
}
UPDATE
Of course the instantiation of InputMain inside of Input should be removed, too. Instead have a member of Type InputMain in Input:
private InputMain inputMain;
and change the constructor of Input to set the value:
public Input (InputMain inputMain) {
this.inputMain = inputMain;
...
And change the instantiation of Input in InputMain to
Input i = new Input(this);

Data in 1 column is getting stored in different row than other columns

I'm Working on a swing project and i have a JDialogbox which contain two textfield and 1 combobox and two button "ok" and "cancel"and a Frame which have a text area which acts like Notepad and all of these Components are connected to Oracle Database whenever I insert data in JDialog and click on Ok the data is stored in database and the frame containing the text area is called and when i save the data written in textarea and click the save button the inserted Data is saved in different row in the Database but not in the same row as the JDialog components
import javax.swing.*;
import java.sql.*;
import java.awt.BorderLayout;
import java.awt.Toolkit;
import java.awt.event.*;
import java.awt.*;
import java.io.File;
import java.io.PrintWriter;
import java.util.Scanner;
public class newmenu implements ActionListener {
JDialog jf;
JButton okBtn,CanBtn;
JTextField tf1,tf3;
JComboBox type;
JLabel prName,prType,prWritter;
JFrame frame;
JMenuBar menuBar;
JMenu file;
JMenuItem open, save, exit;
JFileChooser fileChooser;
JTextArea textArea;
public newmenu(){
jf = new JDialog();
jf.setTitle("New Report");
okBtn = new JButton("Ok");
okBtn.setBounds(10, 140, 60, 20);
okBtn.addActionListener(this);
CanBtn = new JButton("Cancel");
CanBtn.addActionListener(this);
CanBtn.setBounds(100, 140, 100, 20);
tf1 = new JTextField();
tf1.setBounds(150, 20, 100, 20);
String r_Type [] = {"Cosmetics","Pharametical","Medical"};
type = new JComboBox(r_Type);
type.setBounds(150, 60, 100, 20);
tf3 = new JTextField();
tf3.setBounds(150, 100, 100, 20);
prName = new JLabel("Report Name");
prName.setBounds(10, 20, 100, 20);
prType = new JLabel("Report type");
prType.setBounds(10,60,100,20);
prWritter = new JLabel("Report Written");
prWritter.setBounds(10,100,100,20);
jf.add(okBtn);
jf.add(CanBtn);
jf.add(tf1);
jf.add(type);
jf.add(tf3);
jf.add(prName);
jf.add(prType);
jf.add(prWritter);
jf.setSize(300, 200);
jf.setResizable(false);
jf.setLayout(null);
jf.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
jf.setVisible(true);
}
public void notepad(){
frame = new JFrame();
frame.setTitle("Notepad");
file = new JMenu("File");
save = new JMenuItem("Save");
save.addActionListener(this);
exit = new JMenuItem("Exit");
exit.addActionListener(this);
textArea = new JTextArea();
fileChooser = new JFileChooser();
menuBar = new JMenuBar();
frame.setLayout(new BorderLayout());
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.add(textArea);
file.add(save);
file.add(exit);
menuBar.add(file);
frame.setJMenuBar(menuBar);
frame.setSize(800, 600);
frame.setVisible(true);
}
public void insert(){
try {
Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
Connection con = DriverManager
.getConnection("jdbc:oracle:thin:#localhost:1521:xe","system","root");
Statement st = con.createStatement();
st.executeUpdate("insert into report (reportname, reporttype,clientname) VALUES('"
+ tf1.getText() + "','"
+ tf3.getText() + "','" + type.getSelectedItem()+ "')");
}
catch (Exception e1)
{
System.out.println("Exception:" + e1);
}
}
public void notepadinsert(){
try {
Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
Connection con = DriverManager
.getConnection("jdbc:oracle:thin:#localhost:1521:xe","system","root");
Statement st = con.createStatement();
st.executeUpdate("insert into report (report) VALUES('"
+ textArea.getText() + "')");
}
catch (Exception e1)
{
System.out.println("Exception:" + e1);
}
}
public void actionPerformed(ActionEvent ev){
if(ev.getSource()==okBtn){
if( tf1.getText().trim().equals("")){
okBtn.setEnabled(false);
if(tf1.getText().hashCode() != 0){
okBtn.setEnabled(true);
}
}
else{
okBtn.setEnabled(true);
jf.dispose();
insert();
notepad();
}
}
else if(ev.getSource()==CanBtn){
System.exit(0);
}
else if(ev.getSource()==save){
notepadinsert();
}
else if(ev.getSource()==exit){
System.exit(0);
}
}
public static void main(String args[]){
new newmenu();
}
}

Use a flag to check if it's a first request.
private int flag=0;
...
insert(){
...
if(flag==0){
//insert command
flag=1;
}
else
{
//update here.
}
}
UPDATE:
A better way can be to check if the current user has done the update..You have to create a field (like user_name) because I cannot see that in your insert query .
insert(){
...
//search for the current record with user_name in DB
if(!found){
//insert command
}
else
{
//update here.
}
}

Chnged your code like this... In the insert() method now you have data to be stored... Store that data in database in one go... I have added System.out.println(); because i couldn't create an oracle database and this was only way to check if i am getting all the data needed...
You just write your code for inserting into the DataBase in the insert method and pass the values from the string array which i have used to print the values...
public void insert(String[] Str){ // Write your code for insertion
// of values in database
System.out.println(Str[0]);
System.out.println(Str[1]); // I just used these to check
System.out.println(Str[2]); // If i am getting correct values
System.out.println(Str[3]);
}
#Override
public void actionPerformed(ActionEvent ev){
String[] Data_To_Insert = new String[4];
if(ev.getSource()==okBtn){
if( tf1.getText().trim().equals("")){
okBtn.setEnabled(false);
if(tf1.getText().hashCode() != 0){
okBtn.setEnabled(true);
}
}
else{
okBtn.setEnabled(true);
jf.dispose();
notepad();
}
}
else if(ev.getSource()==CanBtn){
System.exit(0);
}
else if(ev.getSource()==save){
Data_To_Insert[0] = tf1.getText();
Data_To_Insert[1] = tf3.getText();
Data_To_Insert[2] = type.getSelectedItem().toString();
Data_To_Insert[3] = textArea.getText();
insert(Data_To_Insert);
}
else if(ev.getSource()==exit){
System.exit(0);
}
}
Also remember you have to create 4 columns to store the data...
Hoping it helped...

Runtime Error Java app

Hi guys I built this app to show students how a loop works graphically, that was working although not correctly, but I'll address that in a question later. I'm not sure what I did to the applet but now I get this runtime error. How do I fix this? thanks in advanced!
import java.awt.*;
import java.awt.event.*;
import java.awt.Color;
import javax.swing.JOptionPane;
public class Checkerboard extends Frame implements ActionListener
{
int[] blocksTextField = new int[15];
Panel blocksPanel = new Panel();
TextArea blocksDisplay[] = new TextArea[16];
TextField start = new TextField (3);
TextField stop = new TextField (3);
TextField step = new TextField (3);
//Colors
Color Red = new Color(255, 90, 90);
Color Green = new Color(140, 215, 40);
Color white = new Color(255,255,255);
//textField ints
int inputStart;
int inputStop;
int inputStep;
//Lables
Label custStartLabel = new Label ("Start : ");
Label custStopLabel = new Label ("Stop : ");
Label custStepLabel = new Label ("Step : ");
//Buttons
Button goButton = new Button("Go");
Button clearButton = new Button("Clear");
//panel for input textFields and lables
Panel textInputPanel = new Panel();
//Panel for buttons
Panel buttonPanel = new Panel();
Checkerboard()
{//constructor method
//set the 3 input textFields to 0
inputStart = 0;
inputStop = 0;
inputStep = 0;
//set Layouts for frame and three panels
this.setLayout(new BorderLayout());
//grid layout (row,col,horgap,vertgap)
blocksPanel.setLayout(new GridLayout(4,4,10,10));
textInputPanel.setLayout(new GridLayout(2,3,20,10));
buttonPanel.setLayout(new FlowLayout());
//setEditable()
//setText()
//add components to blocks panel
for (int i = 0; i<16; i++)
{
blocksDisplay[i] = new TextArea(null,3,5,3);
if(i<6)
blocksDisplay[i].setText(" " +i);
else
blocksDisplay[i].setText(" " +i);
blocksDisplay[i].setEditable(false);
// blocksDisplay[i].setBackground(Red);
blocksPanel.add(blocksDisplay[i]);
}
//add componets to panels
//add text fields
textInputPanel.add(start);
textInputPanel.add(stop);
textInputPanel.add(step);
//add lables
textInputPanel.add(custStartLabel);
textInputPanel.add(custStopLabel);
textInputPanel.add(custStepLabel);
//add button to panel
buttonPanel.add(goButton);
buttonPanel.add(clearButton);
//ADD ACTION LISTENRS TO BUTTONS (!IMPORTANT)
goButton.addActionListener(this);
clearButton.addActionListener(this);
add(blocksPanel, BorderLayout.NORTH);
add(textInputPanel, BorderLayout.CENTER);
add(buttonPanel, BorderLayout.SOUTH);
//overridding the windowcClosing() method will allow the user to clisk the Close button
addWindowListener(
new WindowAdapter()
{
public void windowCloseing(WindowEvent e)
{
System.exit(0);
}
}
);
}//end of constructor method
public void actionPerformed(ActionEvent e)
{
//if & else if to see what button clicked and pull user input
if(e.getSource() == goButton) //if go clicked ...
{
System.out.println("go clicked");
try{
String inputStart = start.getText();
int varStart = Integer.parseInt(inputStart);
if (varStart<=0 || varStart>=15 )throw new NumberFormatException();
System.out.println("start = " + varStart);
// roomDisplay[available].setBackground(lightRed);
String inputStop = stop.getText();
int varStop = Integer.parseInt(inputStop);
if (varStop<=0 || varStart>=15 )throw new NumberFormatException();
System.out.println("stop = " + varStop);
String inputStep = step.getText();
int varStep = Integer.parseInt(inputStep);
if (varStep<=0 || varStep>=15 )throw new NumberFormatException();
System.out.println("step = " + varStep);
for (int i = varStart; i<varStop; varStep++)//ADD WHILE LOOP
{
blocksDisplay[i].setBackground(Red);
blocksDisplay[i].setText(" " +i);
}
}
catch (NumberFormatException ex)
{
JOptionPane.showMessageDialog(null, "You must enter a Start, Stop and Step value greater than 0 and less than 15",
"Error",JOptionPane.ERROR_MESSAGE);
}
}
else if(e.getSource() == clearButton ) //else if clear clicked ...
{
System.out.println("clear clicked");
}
//int available = room.bookRoom(smoking.getState());
//if (available > 0)//Rooms is available
}//end action performed method
public static void main(String[]args)
{
Checkerboard frame = new Checkerboard ();
frame.setBounds(50, 100, 300, 410);//changed size to make text feilds full charater size
frame.setTitle("Checkerboarder Array");
frame.setVisible(true);
}//end of main method
}

Make the constructor public.
public Checkerboard() {
...
}
The error appears because the constructor is package-private, e.g. you can't instantiate the class outside it's package.