Date Overlap Logic And How to Use Array And loop iterations for tabular form rows validation:-

public void Apply()

    {

       

        JegPaBillRatesVOImpl vo=getJegPaBillRatesVO();

        Date StartDate = (Date)vo.getCurrentRow().getAttribute("EffectiveEndDate");

        int flag=0;

    Date EndtDate = (Date)vo.getCurrentRow().getAttribute("EffectiveEndDate");

        System.out.println("StartDate= "+StartDate);

           

       /* if(StartDate.dateValue().getTime() == EndtDate.dateValue().getTime())

        {

        System.out.println("Inside date validation and throw error messages");

        }*/

       

       

        //VO Instance

        JegPaBillRatesDtlVOImpl vo1= getJegPaBillRatesDtlVO();              

     int Total_rows = vo1.getFetchedRowCount();         

        System.out.println("Tatal line rows "+Total_rows);

       

 //Row Instance

   JegPaBillRatesDtlVORowImpl row=null;        

        if(Total_rows>0)

        {

            System.out.println("Tatal rows greter than 0 is "+Total_rows);           

            //Array Declaration

            String sequence1[] = new String[Total_rows];

             Date  StartDate3[] = new Date[Total_rows];

             Date  EndDate3[] = new Date[Total_rows];                     

            // Loop Code For Tabular Rows Validations        

//RowSetIterator Instanc

           RowSetIterator Iter = vo1.createRowSetIterator("Iter");

//Set row range to zero, to traverse from beginning of VO rows collection

            Iter.setRangeStart(0); 

            Iter.setRangeSize(Total_rows);

                   

            for (int i = 0; i < Total_rows; i++)

             {

//Insert Data In To Array

                    row = (JegPaBillRatesDtlVORowImpl)Iter.getRowAtRangeIndex(i);                

                          sequence1[i] = row.getId1().toString();

                          StartDate3[i] = (Date)row.getEffectiveStartDate();

                          EndDate3[i] = (Date)row.getEffectiveEndDate();                          

                         

                          System.out.println(" Outside Exception  StartDate: "+StartDate3[i]);

                          System.out.println(" Outside Exception  EndDate: "+EndDate3[i]);

                          System.out.println(" Outside Exception  sequence1: "+sequence1[i]);

                                  

             }

            //Close row set iterator.           

             Iter.closeRowSetIterator();  

                     

            for (int i = 0; i < Total_rows; i++)

              {

                   for (int j = i + 1; j < Total_rows; j++)

                       {

                            java.sql.Date javaSqlDate;                             

                            javaSqlDate  = EndDate3[i].dateValue();

                           

                              if ((!sequence1[i].equals(sequence1[j])) &&

                                     (StartDate3[j].dateValue().getTime() <= EndDate3[i].dateValue().getTime() )     

                                 )

                                 { 

                                     flag ++;

                                     System.out.println("Dates are wrong ");

                                 }

                          }

              }

                      

                     

         

                   

        }

       

        if (flag!= 0 )

           {

         

           throw new OAException("Date Cannot be Overlap. Please reenter.",

                                                (byte)0);

            }

          else

           {

                    getTransaction().commit();

             

           }

       

     

    } // End of Apply Method