What is the usage of String.format?-JavaBase-php.cn

string.format Usage: 1. Use the local language environment for the new string, formulate the string format and parameters to generate a formatted new string; 2. Use the specified language environment, formulate the string format and parameter generation Formatted string.

What is the usage of String.format?

string.format usage:

Two overloading methods of String.format() string regular type formatting

format(String format, Object… args) The new string uses the local language environment, specifies the string format and parameters to generate a formatted new string.
format(Locale locale, String format, Object… args) Use the specified locale, specify the string format and parameters to generate a formatted string.

The last chestnut used the formatting of character types and integer types. Now I will give examples of commonly used types

String str=null; str=String.format("Hi,%s", "小超"); System.out.println(str); str=String.format("Hi,%s %s %s", "小超","是个","大帅哥"); System.out.println(str); System.out.printf("字母c的大写是：%c %n", 'C'); System.out.printf("布尔结果是：%b %n", "小超".equal("帅哥")); System.out.printf("100的一半是：%d %n", 100/2); System.out.printf("100的16进制数是：%x %n", 100); System.out.printf("100的8进制数是：%o %n", 100); System.out.printf("50元的书打8.5折扣是：%f 元%n", 50*0.85); System.out.printf("上面价格的16进制数是：%a %n", 50*0.85); System.out.printf("上面价格的指数表示：%e %n", 50*0.85); System.out.printf("上面价格的指数和浮点数结果的长度较短的是：%g %n", 50*0.85); System.out.printf("上面的折扣是%d%% %n", 85); System.out.printf("字母A的散列码是：%h %n", 'A');

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Hi,小超 Hi,小超 是个 大帅哥 字母c的大写是：C 布尔的结果是：false 100的一半是：50 100的16进制数是：64 100的8进制数是：144 50元的书打8.5折扣是：42.500000 元 上面价格的16进制数是：0x1.54p5 上面价格的指数表示：4.250000e+01 上面价格的指数和浮点数结果的长度较短的是：42.5000 上面的折扣是85% 字母A的散列码是：41

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##%s String type "Like Please bookmark" ##%c %b ##%d Integer type (decimal) 88 %x Integer type (hexadecimal) FF Integer type (octal ) ##%f Floating point type 8.888 % a Hexadecimal floating point type FF.35AE 9.38 e 5 No examples (basically not used) No example (basically not used) % (% special characters %% can display %) ##%n Line break No examples (basically not used) %tx Date and time types (x represents different date and time conversion characters) No examples (basically not used) Match conversion characters and implement advanced functions. In the first example, the $

Conversion symbols	Detailed description	Example

Character type	'm'
Boolean type	true

		##%o
77

	##%e	Exponential type
	%g	General floating point type (the shorter of f and e types)
	%h	Hash code
	%%	Percent type


	For the convenience of understanding, let’s give an example	Output results

flag

Explanation Example Add a sign to a positive or negative number (“% d”,15) (“d”, 99) ("% 4d", 99) ##, Use "," to group numbers (commonly used to display the amount) ("%,f", 9999.99) 9,999.990000 ( Use brackets to include negative numbers (“%(f”, -99.99) (99.990000) #If it is a floating point number, include the decimal point, if it is hexadecimal or octal, add 0x or 0 (“%#x”, 99)(“%#o”, 99) 0x63 0143 99.450000 and 99.45 First one In the example, it is mentioned that %tx c

Result
15		0	Add 0 in front of the number (commonly used for encryption)
0099		Spaces	Adds the specified number of spaces before the integer
99


	##<	Format the previous one The parameters described by the conversion operator	("%f and %<3.2f", 99.45)
	d,% 2$s”, 99,”abc”)	99,abc

Includes full date and time information

Saturday October 27 14:21:20 CST 2007 F "Year-Month-Day" format 2007-10-27 D "Month/Day/Year" format 10/27/07 r "HH:MM:SS PM" format ( 12-hour format) 02:25:51 PM T "HH:MM:SS" format (24-hour format) 14:28:16 R "HH:MM" format (24-hour format) 14:28 Let’s give an example to facilitate understanding Output results Related learning recommendations:






	Date date=new Date(); //c的使用 System.out.printf("全部日期和时间信息：%tc%n",date); //f的使用 System.out.printf("年-月-日格式：%tF%n",date); //d的使用 System.out.printf("月/日/年格式：%tD%n",date); //r的使用 System.out.printf("HH:MM:SS PM格式（12时制）：%tr%n",date); //t的使用 System.out.printf("HH:MM:SS格式（24时制）：%tT%n",date); //R的使用 System.out.printf("HH:MM格式（24时制）：%tR",date); Copy after login	全部日期和时间信息：星期三九月 21 22:43:36 CST 2016 年-月-日格式：2016-09-21月/日/年格式：16/10/21 HH:MM:SS PM格式（12时制）：10:43:36 下午 HH:MM:SS格式（24时制）：22:43:36 HH:MM格式（24时制）：22:43 Copy after login
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