Question

Ok, basically i’m trying to write 3 columns and N number of rows simultaneously while iterating. The problem is that 2 of the 3 columns are written with the values… even though they appear in the System.out.println(), are not being written in the Excel. Here’s the code:

for(int i = 0; i < versionsToGraph.length; i++) {           
                    List<WsCallEntry> wfCalls = allCalls.get(i);
                    int cant = -1;
                    if(!wfCalls.isEmpty()) {                            
                        for (WsCallEntry wsCallEntry : wfCalls) {   
                            String x = wsCallEntry.getKey();
                            int y = wsCallEntry.getValue();
                            cant++;
                            if(versionsToGraph[i].equals("15.6")) {
                                System.out.println(x + " " + y + " will be added.");
                                XSSFSheet sheet = (XSSFSheet) wb.getSheetAt(0);     
                                XSSFRow row = sheet.createRow(27+cant);                                 

                                XSSFCell celly = row.createCell(10); 

                                celly.setCellValue(y);
                            }else{
                                if(versionsToGraph[i].equals("15.9")) {

                                    System.out.println(x + " " + y + " will be added.");
                                    XSSFSheet sheet = (XSSFSheet) wb.getSheetAt(0);     
                                    XSSFRow row = sheet.createRow(27+cant);                                 

                                    XSSFCell celly = row.createCell(11); 

                                    celly.setCellValue(y);
                                }
                            }                       


                            xValues.add(x); 


                        }                           


                        Collections.sort(xValues, new StringComparator());

                }                           
                }                       
                ArrayList<String> newList = eliminarRepetidos(xValues); 
                int cant = 0;
                for (String newlist : newList) {
                    String x = newlist;
                    XSSFSheet sheet = (XSSFSheet) wb.getSheetAt(0);         
                    XSSFRow row = sheet.createRow(27+cant);                                 
                    XSSFCell cellx = row.createCell(9); 
                    cellx.setCellValue(x);
                    cant++;
                }               
            }

So, it should add in this part of the code, the 15.6, 15.9 Y values, and in the last foreach writes the X values in the Excel.
What i’m getting is X values and 15.9 Y values. What am I not getting the 15.6 ones? 🙁

(from the comment)
I´m using these

import org.apache.poi.ss.usermodel.Cell; 
import org.apache.poi.ss.usermodel.Workbook; 
import org.apache.poi.ss.usermodel.WorkbookFactory; 
import org.apache.poi.xssf.usermodel.XSSFCell; 
import org.apache.poi.xssf.usermodel.XSSFRow; 
import org.apache.poi.xssf.usermodel.XSSFSheet;

Answer 1

You are creating the same row on every iteration of versionsToGraph, you are erasing what was added in previously.

XSSFRow row = sheet.createRow(27+cant);

You should be doing

sheet.getRow(27+cant);

after the first iteration.