Core Java (3) JAVA input and output

A simple JAVA input/output instance contains the most common input/output functions.

Package COM. xujin; import Java. util. date; import Java. util. failed; public class mytest {static partition CIN = new partition (system. in); public static void main (string [] ARGs) {system. out. print ("input your name:"); string name = cin. next (); // read the next word, using space as the standard system. out. print ("input your age:"); int age = cin. nextint (); // read the next int, using space as the standard system. out. print ("input your salary:"); double salary = cin. nextdouble (); syst Em. out. print ("input detail:"); string detail = cin. nextline (); // read the next line. Here is the last press ENTER detail = cin. nextline (); // read the next line // format the output system. out. printf ("Name: % s \ n", name); system. out. printf ("Age: % d \ toct: % <O \ thex: % 1 $ # x \ n", age); // output: Age: 20oct: 24hex: 0x14system. out. printf ("Salary: % #, 8.2f \ ndetail:", salary); system. out. println (detail); // Time Output System. out. printf ("now: % TC \ n", new date (); // output: Wednesday, January 1, January 16 21:02:10 CST 201 3system. out. printf ("% 1 $ S % 2 $ ty % 2 $ TB % 2 $ TD \ n", "now:", new date (); // output: 2013 January 16 system. out. printf ("% S % ty % <TB % <TD \ n", "now:", new date (); // output: 2013 may January 16 // use a static string. the format method is a common formatted string without printing the output system. out. println (detail); string message = string. format ("Hello, % s! You will be % d next year ", name, ++ age); system. Out. Print (Message );}}

Console result:

Input your name: Gin
Input your age: 20
Input your salary: 5000
Input detail: detail...
Name: Gin
Age: 20 Oct: 24
HEX: 0x14
Salary: 5,000.00.
Detail: detail...
Now: Wednesday January 16 21:12:38 CST 2013
Now: September 2013
Now: September 2013
Detail...

Hello, gin! You will be 21 next year

Explanation:

System.out.printf("Age:%d\tOct:%<o\tHex:%1$#x\n",age);//output:Age:20Oct:24Hex:0x14

% <O indicates formatting the preceding value. Age is displayed in octal.
% 1 $ # X indicates that the index is formatted as a value of 1 (1 $, first parameter, starting from 1), and the value is prefixed with 0x or 0 (# For X or O)

System.out.printf("Salary:%#,8.2f\nDetail:",salary);

Contains the decimal point (# To F). 8.2 indicates that the width is 8 characters and the accuracy of the two characters after the decimal point is printed.

Java format output, used after %

Conversion character used for printf

Conversion character	Type
D	Decimal integer
X	Hexadecimal integer
O	Octal integer
F	Fixed Point floating point number
E	Exponential floating point number
G	General floating point number
A	Hexadecimal floating point number
S	String
C	Character
B	Boolean
H	Hash code
TX	Date and Time
%	Percent sign
N	Platform-related line delimiters

The flag used for printf. It is used after %.

　　

Flag	Purpose	Example
+	Print the symbol before the number	+ 3333.33
Space	Add a space before a positive number.	| 1, 3333.33 |
0	Add 0 before the number	003333.33
-	Left aligned	| 1, 3333.33 |
(	Negative values are enclosed in parentheses.	(3333.33)
,	Add group Separator	3,333.33
# (For F)	Contains decimal point	3,333.
# (For X or O)	Add prefix 0x or 0	0 xcafe
^	Convert to uppercase	0 xcafe
$	Specify the format parameter index. For example, % 1 $ D and % 1 $ D indicate that the first parameter is printed in decimal and hexadecimal notation.	159 9f
<	Format the preceding parameters. For example, % d % <X indicates that the same parameter is printed in decimal and hexadecimal notation.	159 9f

Time and date Conversion characters:

Conversion character type example

C complete Date and Time mon Feb 09 18:05:19 PST 2004

F ISO 8601 date

D U.S. time format (mm/DD/year) 02/09/2004

T 24-hour time 18:05:19

06:05:19 R 12-hour time

R 24 hours no second time

Y four-digit year 2004

The last two digits of Y 04

The first two 20 in C

Complete spelling of month B: February

The abbreviation of B or H month is Feb.

M two months (add 0 before) 02

D two days (add 0 before) 09

E Date (do not add 0 before) 9

A complete Monday of the week

Mon

J. The number of days of the year, and the three digits are 0 069.

H: 24-hour, with two digits 0 and 18

K In 24-hour format. Do not add 0 to 18

I 12-hour system, with two digits 0 06

L 12-hour system, two do not add 0 6

M minutes, supplemented by 0 05

S second, complement 0 to 19

L millisecond, three digits 0 047

N in milliseconds, 9-bit complement 0 047000000

P upper-afternoon capital pm

P upper/lower case pm

Z rfc 822 numeric offset from GMT-0800

Z Time Zone PST

S 00:00:00 seconds from 1078884319

E 00:00:00 Ms count 1078884319047