== four spellings, one result ==
Hi Asha, 3 items, Rs 1499.50
Hi Asha, 3 items, Rs 1499.50
Hi Asha, 3 items, Rs 1499.50
Hi Asha, 3 items, Rs 1499.50
format == formatted == Formatter: true

== formatted() on a text block ==
Invoice for Asha
  items :     3
  total :   1,499.50

== printf returns the PrintStream, so calls chain ==
one two three

== %n vs \n ==
true on this platform (line.separator is \n)

== an array argument: spread as the varargs, unless you cast it to Object ==
x-1
p-q
true