string formatting - What does the numbers in Java printf() mean? -


when see in java, know .2 decimal place, f float, n newline, etc. 6? 

system.out.printf("%6.2f2%n", somedouble);

it stands length of string returned printf method. in case string @ least 6 characters long.

which means if

somedouble=pi

then

system.out.printf("%6.2f2%n", somedouble);

will print out string

"  3.14"

(i.e. 2 whitespaces followed 4 characters containing 3.14)

another example 

system.out.printf("%2.2f2%n", somedouble);

which prints out

"3.14"

we can see this not override .2 or else in command if shorter value given needed other rules apply.

so makes sure there whitespace preceding value.


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