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

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

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What is the usage of String.format?

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Oct 27, 2020 am 11:30 AM

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

##%sString type"Like Please bookmark"##%c%b##%dInteger type (decimal)88%xInteger type (hexadecimal) FFInteger type (octal )##%fFloating point type8.888% aHexadecimal floating point typeFF.35AE9.38 e 5No examples (basically not used)No example (basically not used)% (% special characters %% can display %)##%nLine breakNo examples (basically not used)%txDate and time types (x represents different date and time conversion characters)No examples (basically not used)

String?str=null;??
????str=String.format("Hi,%s",?"小超");??
????System.out.println(str);??
????str=String.format("Hi,%s?%s?%s",?"小超","是個","大帥哥");????????????
????System.out.println(str);???????????????????????????
????System.out.printf("字母c的大寫是：%c?%n",?'C');??
????System.out.printf("布爾結(jié)果是：%b?%n",?"小超".equal("帥哥"));??
????System.out.printf("100的一半是：%d?%n",?100/2);??
????System.out.printf("100的16進(jìn)制數(shù)是：%x?%n",?100);??
????System.out.printf("100的8進(jìn)制數(shù)是：%o?%n",?100);??
????System.out.printf("50元的書打8.5折扣是：%f?元%n",?50*0.85);??
????System.out.printf("上面價格的16進(jìn)制數(shù)是：%a?%n",?50*0.85);??
????System.out.printf("上面價格的指數(shù)表示：%e?%n",?50*0.85);??
????System.out.printf("上面價格的指數(shù)和浮點(diǎn)數(shù)結(jié)果的長度較短的是：%g?%n",?50*0.85);??
????System.out.printf("上面的折扣是%d%%?%n",?85);??
????System.out.printf("字母A的散列碼是：%h?%n",?'A');

Hi,小超?
Hi,小超?是個?大帥哥??
字母c的大寫是：C???
布爾的結(jié)果是：false???100的一半是：50???100的16進(jìn)制數(shù)是：64???100的8進(jìn)制數(shù)是：144???50元的書打8.5折扣是：42.500000?元??
上面價格的16進(jìn)制數(shù)是：0x1.54p5???
上面價格的指數(shù)表示：4.250000e+01???上面價格的指數(shù)和浮點(diǎn)數(shù)結(jié)果的長度較短的是：42.5000???上面的折扣是85%???字母A的散列碼是：41

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

ExplanationExampleAdd 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 014399.450000 and 99.45First 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 2007F"Year-Month-Day" format2007-10-27D"Month/Day/Year" format10/27/07r"HH:MM:SS PM" format ( 12-hour format)02:25:51 PMT"HH:MM:SS" format (24-hour format)14:28:16R"HH:MM" format (24-hour format)14:28Let’s give an example to facilitate understandingOutput resultsRelated learning recommendations:






	Date?date=new?Date();?????????????????????????????????? ????//c的使用?? ????System.out.printf("全部日期和時間信息：%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時制）：%tr%n",date);?? ????//t的使用?? ????System.out.printf("HH:MM:SS格式（24時制）：%tT%n",date);?? ????//R的使用?? ????System.out.printf("HH:MM格式（24時制）：%tR",date);	全部日期和時間信息：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時制）：10:43:36?下午?? HH:MM:SS格式（24時制）：22:43:36??HH:MM格式（24時制）：22:43
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