Question

I am using Apache POI to read excel sheets. Excel sheets will have around 50 columns. But I need to read only first 20 columns.

How do I do this in Apache POI so that extra columns are not read?

Answer 1

You can iterate every cell for a given row, and ignore all extra columns beyond 20:

Sheet sheet = wb.getSheetAt(0);
for (Row row : sheet) {
    for (int i = 0; i < 20; i++) {
        Cell cell = row.getCell(i);
    }
}