Use the weekday number as an array index. Before adding dates, add one empty entry to each weekday before
start; otherwise the first date in those columns would appear a week too early. For day , the slot number is , whose remainder modulo 7 selects the column. The source's example makes clear that start counts empty weekday cells, rather than individual printed space characters.[ref]final class Column extends ArrayList<Data> {
private static final long serialVersionUID = 1L;
}
static String month(int start, int numDays) {
if (start < 0 || start >= 7 || numDays < 1 || numDays > 31)
throw new IllegalArgumentException("invalid month parameters");
String[] days = {"Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"};
int ncols = days.length;
List<Column> output = new ArrayList<Column>(ncols);
for (int c = 0; c < ncols; ++c) {
Column column = new Column();
column.add(new StringData(days[c], true));
output.add(column);
}
for (int c = 0; c < start; ++c)
output.get(c).add(new StringData("", true));
for (int d = 1; d <= numDays; ++d) {
int c = (start + d - 1) % ncols;
output.get(c).add(new IntegerData(d, false));
}
return printData(output);
}The two-character headers force every column to width two, and right justification aligns one-digit dates with the units digits of two-digit dates. Date appears in data row , below the header. For
month(1,30) the visible result isSu Mo Tu We Th Fr Sa
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