What is the usage of String.format?

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.

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');

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

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);	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
	java basic tutorial

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