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(Reprinted from: http://www.cnblogs.com/happyday56/p/3996498.html)

The format () method of the string class is used to create a formatted string and to concatenate multiple string objects. Students familiar with C language should remember the C language of the sprintf () method, the two have similarities. There are two overloaded forms of the format () method.

Format (string format, Object ... args) a new string that uses the local locale to develop a string format and parameters to generate a new formatted string.

Format (locale locale, string format, Object ... args) uses the specified locale to develop string formatting and parameters to generate a formatted string.

Displays different conversion characters that implement different data types to string conversions.

Conversion character	Description	Example
%s	String type	"Mingrisoft"
%c	Character type	' m '
%b	Boolean type	True
%d	Integer type (decimal)	99
%x	Integer type (hex)	Ff
%o	Integer type (octal)	77
%f	Floating-point types	99.99
%a	Hexadecimal floating-point type	Ff.35ae
%e	Index type	9.38e+5
%g	Common floating-point types (shorter in type F and e)
%h	Hash code
%%	Percent type	％
%n	Line break
%tx	Date and Time type (x represents a different date and time conversion character

Test Cases

    public static void Main (string[] args) {        String str=null;        Str=string.format ("hi,%s", "Wang Li");        System.out.println (str);        Str=string.format ("hi,%s:%s.%s", "Wang Nan", "Li Li", "Wang Zhang");                  System.out.println (str);                                 System.out.printf ("Uppercase of the letter A is:%c%n", ' a ');        System.out.printf ("3>7 results are:%b%n", 3>7);        System.out.printf ("Half of 100 is:%d%n", 100/2);        System.out.printf ("100 of 16 binary numbers are:%x%n", +);        System.out.printf ("100 of 8 binary numbers are:%o%n", +);        System.out.printf ("50 yuan book 8.5 discount is:%f Yuan%n", 50*0.85);        System.out.printf ("16 of the above price is:%a%n", 50*0.85);        System.out.printf ("The index of the above price indicates:%e%n", 50*0.85);        System.out.printf ("The index of the above price and the length of the floating point result is shorter:%g%n", 50*0.85);        System.out.printf ("The above discount is%d%%%n",);        System.out.printf ("The hash code for the letter A is:%h%n", ' a ');    }

Java placeholder App