اسئلتكم واستفساراتكم

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.net.URL;
import java.sql.*;
import java.lang.Runtime;

public class TextFieldDemo extends JFrame implements ActionListener
{
// Declare three text fields
private JTextField jtfNum1, jtfNum2, jtfResult;
private JButton jbtAdd;

int result2;


// Main method
public static void main(String[] args)
{
TextFieldDemo frame = new TextFieldDemo();
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);

}

// Constructor
public TextFieldDemo()
{
setTitle("TextFieldDemo");
setBackground(Color.yellow);


// Use panel p1 to group text fields
JPanel p1 = new JPanel();
p1.setLayout(new FlowLayout());
p1.add(new JLabel("Number 1"));
p1.add(jtfNum1 = new JTextField(3));
p1.add(new JLabel("Number 2"));
p1.add(jtfNum2 = new JTextField(3));
p1.add(new JLabel("Result"));
p1.add(jtfResult = new JTextField(4));
jtfResult.setEditable(false); // Set jtfResult noneditable

// Use panel p2 for the button
JPanel p2 = new JPanel();
p2.setLayout(new FlowLayout());
p2.setForeground(Color.yellow);
p2.add(jbtAdd = new JButton("Add"));


// Set FlowLayout for the frame and add panels to the frame
getContentPane().setLayout(new BorderLayout());
getContentPane().add(p1, BorderLayout.NORTH);
getContentPane().add(p2, BorderLayout.SOUTH);

// Register listener
jbtAdd.addActionListener(this);
}

// Handle the add operation
public void actionPerformed(ActionEvent e)
{
if (e.getSource() == jbtAdd)
{
// Get int values from text fields and use trim() to
// trim extraneous space in the text field
int num1 = (Integer.parseInt(jtfNum1.getText().trim()));
int num2 = (Integer.parseInt(jtfNum2.getText().trim()));
try
{

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con = DriverManager.getConnection("jdbc:odbc:JDBC3","", "");
Statement stmt = con.createStatement( );
String SQLText;
int ResultCode;


try
{
SQLText = "create table Tatabace ( num1 int, num2 int )";
ResultCode = stmt.executeUpdate( SQLText );
}

catch (java.lang.Exception ex)
{
System.out.println( " " );

}


// Insert Data

SQLText="insert into tatabace"
+"(num1,num2)"
+"values("+""+num1+","+num2+")";

ResultCode = stmt.executeUpdate(SQLText);
if(ResultCode==1)
System.out.println ("done");
else
System.out.println ("Not Done");

SQLText = "select num1,num2 from Tatabace";
ResultSet rs = stmt.executeQuery(SQLText);

while(rs.next( ))
{
int Num1 = rs.getInt("num1");
int Num2 = rs.getInt("num2");
result2 = Num1+Num2;

}



}
catch (ClassNotFoundException a)
{
System.out.println("Unable to load Driver Class");
return;
}

catch (SQLException se)
{
System.out.println("SQL Exception: " + se.getMessage( ));
se.printStackTrace(System.out);
}
catch (java.lang.Exception ex)
{
System.out.println( "** Error on create Student table ** " );
ex.printStackTrace ();
}

// Set result in TextField jtfResult
jtfResult.setText(String.valueOf(result2));
}
}
}

// TextFieldDemo.java: Add two numbers in the text fields