使用Java，Apache POI在每3列之后在Excel中创建列标题

Question

I'm trying to create an excel sheet wherein I'm getting all the Header values from an ArrayList and looping it to print the headers after every 3 cells. This is my code.

    for (int x = 4; x < projectLocationList.size(); x++) {
        columnHeaderCell = regionList.createCell(x+3);
        columnHeaderCell.setCellValue(projectLocationList.get(x-3));
        columnHeaderCell.setCellStyle(columnHeaderStyle);
    }

For x=4 because I have to print column from 7th cell. The problem I'm facing is I'm getting only the last three values. Please help me fix this for loop. Thanks.

Answer 1

initialize for loop from 0 only and take a different variable outside the for loop for creating cell number.

static int cellNum = 7;
for (int x = 0; x < projectLocationList.size(); x++) {
    columnHeaderCell = regionList.createCell(cellNum);
    columnHeaderCell.setCellValue(projectLocationList.get(x));
    columnHeaderCell.setCellStyle(columnHeaderStyle);
cellNum = cellNum + 3;
}