How to use : Java GUI SwingWorker and BackgroundWorker

setProgress((int)((i*100)/1000)+1);

protected Void doInBackground() throws Exception {
	
	/*** Import ***/
	for (int i = 0; i < myArrList.size(); i++) {
		// SQL Insert
		String sql = "INSERT INTO data "
				+ "(DataLine) "
				+ "VALUES ('" + myArrList.get(i) + "') ";
		s.execute(sql);
		setProgress((int)((i*100)/myArrList.size())+1);
	}
		
	return null;
}

setProgress((int)((i*100)/myArrList.size())+1);

CREATE TABLE `data` (
  `ID` int(4) unsigned zerofill NOT NULL auto_increment,
  `DataLine` varchar(50) NOT NULL,
  PRIMARY KEY  (`ID`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;

package com.java.myapp;

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JProgressBar;
import javax.swing.SwingWorker;
import javax.swing.JTextField;

public class MyForm extends JFrame {
	
	private JProgressBar progressBar;
	private JButton btnStart;
	private JTextField txtFile;

	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				MyForm form = new MyForm();
				form.setVisible(true);
			}
		});
	}

	public MyForm() {

		// Create Form Frame
		super("ThaiCreate.Com Java GUI Tutorial");
		setSize(525, 270);
		setLocation(500, 280);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		getContentPane().setLayout(null);

		// Label Title
		final JLabel lblTitle = new JLabel("Import Data", JLabel.CENTER);
		lblTitle.setBounds(61, 24, 370, 14);
		getContentPane().add(lblTitle);
		
		// ProgressBar
		progressBar = new JProgressBar();
		progressBar.setStringPainted(true);
		progressBar.setMinimum(0);
		progressBar.setMaximum(100);
		progressBar.setBounds(162, 98, 190, 20);
		getContentPane().add(progressBar);


		// Button Start
		btnStart = new JButton("Start");
		btnStart.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				btnStart.setEnabled(false);
				EventQueue.invokeLater(new Runnable() {
					@Override
					public void run() {
						new BackgroundWorker().execute();
					}
				});
	
			}
		});
		btnStart.setBounds(209, 144, 100, 23);
		getContentPane().add(btnStart);
		
		// Label File Name
		JLabel lblFileName = new JLabel("File Name");
		lblFileName.setBounds(99, 70, 57, 14);
		getContentPane().add(lblFileName);
		
		// Text File
		txtFile = new JTextField();
		txtFile.setBounds(162, 67, 182, 20);
		getContentPane().add(txtFile);
		txtFile.setColumns(10);
		
		// Button Choose
		JButton btnChoose = new JButton("...");
		btnChoose.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				JFileChooser fileopen = new JFileChooser();
				int ret = fileopen.showDialog(null, "Choose file");
				if (ret == JFileChooser.APPROVE_OPTION) {
					// Read Text file
					txtFile.setText(fileopen.getSelectedFile().toString());
				}
			}
		});
		btnChoose.setBounds(354, 66, 26, 23);
		getContentPane().add(btnChoose);

	}
	
	public class BackgroundWorker extends SwingWorker<Void, Void> {

		public BackgroundWorker() {
			addPropertyChangeListener(new PropertyChangeListener() {
				@Override
				public void propertyChange(PropertyChangeEvent evt) {
					progressBar.setValue(getProgress());
				}

			});
		}

		@Override
		protected void done() {

			JOptionPane.showMessageDialog(null,
					"Import Data Successfully");
			btnStart.setEnabled(true);
		}

		protected Void doInBackground() throws Exception {
			
			// Read Text File
			File file = new File(txtFile.getText());
			ArrayList<String> myArrList = new ArrayList<String>();
			try {
				BufferedReader br = new BufferedReader(new FileReader(file));
				String line;
				while ((line = br.readLine()) != null) {
					myArrList.add(line);
				}
				br.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
			// Import to Database //
			Connection connect = null;
			Statement s = null;
			
			try {
				Class.forName("com.mysql.jdbc.Driver");
				connect = DriverManager.getConnection(""
						+ "jdbc:mysql://localhost/mydatabase"
						+ "?user=root&password=root");
				s = connect.createStatement();
				
				/*** Import ***/
				for (int i = 0; i < myArrList.size(); i++) {
					// SQL Insert
					String sql = "INSERT INTO data "
							+ "(DataLine) "
							+ "VALUES ('" + myArrList.get(i) + "') ";
					s.execute(sql);
					setProgress((int)((i*100)/myArrList.size())+1);
					Thread.sleep(10);
				}


			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

			try {
				if (s != null) {
					s.close();
					connect.close();
				}
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				System.out.println(e.getMessage());
				e.printStackTrace();
			}
			
			return null;
		}
		
	}
	
}