System.out is an instance of type PrintStream

PrintStream methods

• void print(..)
• void println(..)
• void println()
• void printf(String fmt, ...)

The first two are designed to convert the argument to a suitable character string.

The second inserts newline in the output.

The third only outputs a newline.

The printf method provides formatting of the output.

The number of parameters to printf depends on the number of conversion specifications in the first parameter - the format string.