This lesson is all about simple Java output concepts involving the use of print, println, and printf. The exercises contained in this lesson that use the printf method will use only the %d, %s, and %f format specifiers, although there are many more available. However, other format indicators will be used, such as field width, number of decimal places for floating point values, the use of the comma specifier for inserting commas in large values and using the negative flag for left justification.