format f

4 methods, all rounded, for example:ImportJava.math.BigDecimal; ImportJava.text.DecimalFormat; ImportJava.text.NumberFormat; Public classFormat {Doublef = 111231.5585; Public voidM1 () {BigDecimal bg=NewBigDecimal (f); DoubleF1 = Bg.setscale (2,

Use of 1:scanner (learn)(1) The class that appears after JDK5 for keyboard input data.   (2) Construction method: A: Explained system.in this thing.      It is actually the standard input stream, corresponding to the keyboard entry B: Construction

Control file backup and recovery (RMAN tool) database version SQL> select * from v$version;BANNER--------------------------------------------------------------------------------Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - ProductionPL/

Html/css part1. What is a box model? In a Web page, the size of an element's space is composed of several parts, including the contents of the element (content), the element's padding (padding), the border of the element (border), and the margin of

  To view the content in the file, you can use many commands. Today I will introduce several commonly used commands for viewing the file content. Of course, there is an ace command (Tool) vim on the Linux system. The use of this tool has been

  Command: ln usage Command name: ln Permission: All Users Usage: ln [options] source dist, where the option format is: [-BdfinsvF] [-S backup-suffix] [-V {numbered, existing, simple}] [-- Help] [-- version] [--] Note: there is a so-called link in

Common linux commands do not forget to note the commonly used basic linux commands. These days, when I have been drum up linux, some basic commands have not been used for a long time, however, some occasionally used commands, which will inevitably

Summary of python file operations, File Read operations Example: Print ("-> file handle acquisition, read operation:") f = open ('untitle', 'R', encoding = 'utf8') d = f. read () f. close () print (d) print ('-> Example 2:') f = open ('untitle', 'R',

Re-learn Python, learn pythonFile Read operations   Example: 1 print ("-> file handle acquisition, read operation:") 2 3 f = open ('Untitled ', 'R', encoding = 'utf8 ') 4 d = f. read () 5 f. close () 6 print (d) 7 8 print ('-> Example 2:') 9 f =

Java date: add one day, year, month, and date plus 1, date + 1, month + 1, year + 1, and date System. out. println ("String type" + endDate); // The time when the page is passed to the background is String type SimpleDateFormat sdf = new

"Go" C Language output format summaryC-Language output format summary November 01, 2008 Saturday 04:23 p.m. 1 General formatprintf (format control, output table column) For example: printf ("i=%d,ch=%c\n", i,ch);         Description: (1)

Java basics and java tips I have never written a blog before. Now I start to review and remember some easy-to-Forget tips. One java retains two decimal places 1> BigDecimal Method Double f = 11.3156; BigDecimal B = new BigDecimal (f ); F = B.

Unlike automatic database backup, the system administrator must take certain actions to protect data from unauthorized users. If you are using MySQL, you can use some convenient functions to protect the system and greatly reduce the risk of

I. linux boot process (first, let's take a look at the linux boot Guide process) boot self-check MBR boot (masterbootrecord master boot record) GRUB Menu (if multiple systems are used, which system is used to choose to use) load the Linux kernel

The Ping command sends an Internet Control Message Protocol (ICMP) echo request message to verify the IP-level connection with another TCP/IP computer. it is an important command, today, I will explain how to use the ping command in linux. • The

Directory: 1. programs and processes; 1.1 process categories; 1.2 process attributes; 1.3 parent and child processes; 2. process management; 2.1ps process monitoring tool; 2.1.1ps parameter description; 2.1.2ps application example; 2.2pgrep3; kill,

Locate: the search speed based on the file database is fast, and fuzzy matching is supported. -I ignore case-nN find the corresponding file and only show the first N rows of updatedb: locate database generation, but the speed is slow, you need to

Although Linux and WindowsNT/2000 systems are the same multi-user systems, there are many important differences between them. For many habits Although Linux is a multi-user system like Windows NT/2000, there are many important. For many

Usage of float type in mysql bitsCN.com A single-precision floating point uses 4-byte (32bit) to represent a floating point.A computer floating point number that adopts the IEEE754 standard is represented in binary format internally.For example, 7.22

For detailed parsing of Linux operating system PS commands, you need to monitor and control the processes in the system, and use ps commands to meet your requirements. /Bin/psps displays the instantaneous travel status and is not dynamically