String.format("%,d", value);
value에 숫자형 데이터를 넣는다.
String.format에서 지원하는 종류
Converter Flag Explanation
d A decimal integer.
f A float.
n A new line character appropriate to the platform running the application. You should always use %n, rather than \n.
tB A date & time conversion—locale-specific full name of month.
td, te A date & time conversion—2-digit day of month. td has leading zeroes as needed, te does not.
ty, tY A date & time conversion—ty = 2-digit year, tY = 4-digit year.
tl A date & time conversion—hour in 12-hour clock.
tM A date & time conversion—minutes in 2 digits, with leading zeroes as necessary.
tp A date & time conversion—locale-specific am/pm (lower case).
tm A date & time conversion—months in 2 digits, with leading zeroes as necessary.
tD A date & time conversion—date as %tm%td%ty
08 Eight characters in width, with leading zeroes as necessary.
+ Includes sign, whether positive or negative.
, Includes locale-specific grouping characters.
- Left-justified..
.3 Three places after decimal point.
10.3 Ten characters in width, right justified, with three places after decimal point.
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