Delete Code in Java Project

Example : How to Delete/Remove data or a single record from an Oracle 10g/11g database using NetBeans 8.2?

// Write Java-Oracle 10g Connectivity Code here first properly/globally.

try {

        String studentId = txtStudentId.getText();

        if(studentId.equals(""))
        {
            JOptionPane.showMessageDialog(this,
                    "Enter Student ID");
            return;
        }

        int confirm = JOptionPane.showConfirmDialog(
                this,
                "Are you sure to delete this record?",
                "Confirm Delete",
                JOptionPane.YES_NO_OPTION);

        if(confirm == JOptionPane.YES_OPTION)
        {

            String sql =
            "DELETE FROM student_register WHERE student_id=?";

            PreparedStatement pst =
                    conn.prepareStatement(sql);

            pst.setString(1, studentId);

            int i = pst.executeUpdate();

            if(i > 0)
            {
                JOptionPane.showMessageDialog(this,
                        "Record Deleted Successfully");

                resetForm();
            }
            else
            {
                JOptionPane.showMessageDialog(this,
                        "Record Not Found");
            }
        }

    }
    catch(Exception e)
    {
        JOptionPane.showMessageDialog(this,
                "Delete Error : " + e);
    }
}

-------------------------------  2nd Method  -----------------------------------

// Write Java-Oracle 10g Connectivity Code here first properly/globally.

private void jBtnRegDeleteActionPerformed(java.awt.event.ActionEvent evt) 
{    
     String UID = jTxtRegUname.getText().trim();
        try
        {          
            pst=conn.prepareStatement("delete  from REGISTRATION where REGUNAME = '"+UID+"'");
            pst.executeUpdate();
            //out.println("Data Delete Succefully....");
            showMessageDialog(null,"Data Delete Successfully....");
        }
        catch(Exception e)
        {
            System.out.println(e);
        }
}