to use if

Org.springframework.util.AssertThe assert translates to Chinese as "assertion". You should know this concept by using JUnit.is to determine that an actual value is expected for itself, and throws an exception if it is not the same.Assert is often

1 character types Char and varchar#官网: https://Dev.mysql.com/Doc/Refman/5.7/En/Char. html# Note: The parameters in char and varchar brackets refer to the length of the character #char type: fixed length, simple rough, wasted space, fast access speed

This article was reproduced from: http://nedwu13.blogspot.tw/2013_11_01_archive.html Asset Bundle Workflow and Character conversion example-Lau There are two kinds of resources in unity (C.C. have two kinds?) ： Resources: 10

1. How to Inherit The access level of the public parent class does not change Protected the public member of the parent class is programmed protected in the derived class, and the rest is unchanged All members of the private parent

PEP8 Python Coding Specification One code orchestration 1 indent. Indentation of 4 spaces (the editor can do this), no tap, no mix of taps and spaces.2 The maximum length per line is 79, the line break can use backslashes, preferably with

The simple definition of tcpdump is: The dump the traffic on a network, based on the user's definition of the packet interception of packets on the Data Packet Analysis tool. Tcpdump can intercept the "head" of the packets that are transmitted in

OSX's File systemOSX uses the Unix file system, all the files are hanging in the directory/below, so there is no need to have the concept of the drive letter under Windows.The hard drives you see on the desktop are hung under/volumes.For example,

Obstack IntroductionObstack initializationApply for an object in ObstackReleasing objectsApply Growing ObjectGet Obstack StatusData alignmentHere is an introduction to Obstack from the wiki:Obstack is the GNU Extension for memory management in the C

All MySQL columns can use the index. Using indexes on related columns is the best way to improve the performance of select operations. Defines the maximum number of indexes and the maximum index length per table based on the storage engine. All

Pam Detailed Introduction2014-04-02 09:26:41Tags: Pam original works, allow reprint, please be sure to use hyperlinks in the form of the original source of the article, author information and this statement. Otherwise, the legal liability will be

We have selected 70 shell foot questions and answers you may encounter for your interview. Knowing a script or at least knowing the basics is critical to your system administrator, and it helps you automate many tasks in your work environment. Over

/etc/resolv.conf is a DNS client configuration file that sets the IP address and DNS domain name of the DNS server, and also contains the domain name search order for the host.The file is a configuration file that is used by the Domain name Resolver

I. MAC OSX shortcut keysCtrl+shift Quick Zoom Dock icon will be zoomed in temporarily, and if you open the dock zoom inCommand+option+w to close all windowsCommand+w Close the current window (can close Safari tab bar, very useful)Command+option+m to

Add by Zhj: This is Douban friends finishing PEP8, is a simple version of PEP8, because the original PEP8 content too much, so it is recommended to read this article first, and then see PEP8 Chinese TranslationOriginal: http://www.douban.com/note/134

Each class is compiled with a class object stored in the. class file, and the JVM uses the ClassLoader (class Loader) to load the class's bytecode file (. Class), the ClassLoader is essentially a classloader chain, in general, we only use a native

Third, operatorJava basic operators are grouped by function in the following categories:1. The arithmetic operator (+,-, *,/,%,++,--) Java extends the addition operator so that it can concatenate strings, such as "abc" + "de", and get the string

PEP8 Python Coding SpecificationA code orchestration1 indent. Indentation of 4 spaces (the editor can do this), no tap, no mix of taps and spaces.2 The maximum length per line is 79, the line break can use backslashes, preferably with parentheses.

Linux system, sometimes the ordinary user some things can not be done, unless it is the root user can do. Then you need to useThe SU command temporarily switches to root to work.su:substitute[' s?bst?tju?t] instead of userThe syntax for SU is:SU

1. One-click Compressed RAR desktop Backup According to our most conventional idea, the way to package the desktop should be to use WinRAR to compress the entire desktop to save, when there is a problem need to recover, just unpack the selection

If, according to General thinking, every time we operate on a pawn, such as a tank, we have to use if to judge his state, so there will be a lot of if,else or Swith in the code. But we can see that what we need is his behavior in a certain state,