String name= jTextField1.getText();
        String mobile= jTextField2.getText();
        String email= jTextField3.getText();
        if (name.isEmpty())
            JOptionPane.showMessageDialog(null,"Please enter your name");
        else if (mobile.isEmpty())
            JOptionPane.showMessageDialog(null,"Please enter your mobile");
        else if (email.isEmpty())
            JOptionPane.showMessageDialog(null,"Please enter your email");
        else {
            try {
        Class.forName("java.sql.DriverManager");
        Connection con = (Connection) DriverManager.getConnection ("jdbc:mysql://localhost:3306/practicals", "root", "system");
        Statement stmt = (Statement) con.createStatement();
        String query="insert into contacts values ('"+name+"','"+mobile+"','"+email+"');";
        stmt.executeUpdate(query);
        JOptionPane.showMessageDialog(this, "Added Successfully");
        } catch (Exception e)
        {
            JOptionPane.showMessageDialog(null,e.getMessage());
        }
        }
    }