Update Code in Java Project

// Write Connectivity code first here globally.

private void jBtnRegUpdateActionPerformed(java.awt.event.ActionEvent evt) 
{       
        String gender = " ";
        if(jRdbRegMale.isSelected())
          {
            gender="Male";
          }
        if(jRdbRegFemale.isSelected())
          {
            gender="Female";
          }
        if(jRdbRegOther.isSelected())
          {
            gender="Other";
          }
        
        String CmbState1 = (String)jCmbRegState.getSelectedItem();
        
        String ChkMatric = "";
        String ChkInter = "";
        String ChkGrad = "";
        String ChkPg = "";
        if(jChkRegMatric.isSelected())
          {
            ChkMatric="Matric";
          }
        else
          { 
            ChkMatric ="null";
          }

         if(jChkRegInter.isSelected())
          {
            ChkInter="Inter";
          }
         else
          { 
            ChkInter ="null";
          }

         if(jChkRegGrad.isSelected())
          {
            ChkGrad="Graduation";
          }
         else
          { 
            ChkGrad ="null";
          }
 
         if(jChkRegPg.isSelected())
          {
            ChkPg="PG";
          }
         else
          { 
            ChkPg ="null";
          }
        
        Date dd=jDtRegDob.getDate();                        //import java.util.Date;
        Format xx= new SimpleDateFormat("dd-MMM-yyyy");     //import java.text.Format; & import 
                                                                     java.text.SimpleDateFormat;
        String pp =xx.format(dd);
                 
        String TxtSlno = jTxtRegSlno.getText();
        String TxtName = jTxtRegName.getText();
        String TxtFname = jTxtRegFname.getText();
        String TxtMobile = jTxtRegMobile.getText();
        String TxtEmail = jTxtRegEmail.getText();
        String RtbAddress = jRtbRegAddress.getText();
        String TxtUname = jTxtRegUname.getText();
        String PdPsd = new String(jPdRegPsd.getPassword());        
        
        try
        {
            pst=conn.prepareStatement("update REGISTRATION set REGSLNO='"+TxtSlno+"',REGNAME=
                '"+TxtName+"',REGFNAME='"+TxtFname+"',REGDOB='"+pp+"',REGGENDER='"+gender+"',
                REGMATRIC= '"+ChkMatric+"',REGINTER='"+ChkInter+"',REGGRAD='"+ChkGrad+"',
                REGPG='"+ChkPg+"',REGMOBILE='"+TxtMobile+"',REGEMAIL='"+TxtEmail+"',
                REGSTATE='"+CmbState1+"',REGADDRESS='"+RtbAddress+"', REGPSD='"+PdPsd+"' 
                where REGUNAME='"+TxtUname+"'");
            pst.executeUpdate();
            showMessageDialog(null, "Data Update Successfully...");            
        }
        catch(Exception e)
        {
           System.out.println(e);
        }     
 }