Technology Without Borders, to carry forward the selfless spirit of sharing
2013/03/26
Some practical contradictions of the reality of project management
2013/03/25
A Chinese famous enterprises then test cattle
Under Linux installation, start the MySQL
About the the performance test tesseract-ocr tools to identify some of the ideas in the verification code
LoadRunner using the system () function call Tesseract-OCR recognition verification code script code
Full-width and half-width of the difference between input method
A What is the full-width and half-width?
(1) angle - a character occupies two standard character position.
Kanji characters and provides for the full-width English characters and the national standard GB2312-80 graphic symbols and special characters are full-width characters. The general command of the system do not have the full-width characters, just word processing will use the full-width characters.
(2) half-width - refers to the position occupied by a character of a standard character.
Usually letters of the alphabet, numeric keys, symbol keys are half-width, within a half-width of the display code is a byte. Within the system, these three characters are handled as a basic code, so the user input commands and parameters generally use half-width.
B full-width and half-width of each in what circumstances?
The full-width accounted for two-byte, half-width of one byte.
The half-width full-width punctuation, full-width punctuation accounted for two-byte, half-width of one byte, regardless of the half-width or full-width, Chinese characters, or to account for the two bytes.
Only in the source code of the programmed use of the half-width punctuation (excluding internal data string)
(In fact, this case simply does not exist the concept of full-width of the half-width on a computer that does not support Chinese characters and other languages can only use half punctuate)
For most fonts, full angle looks larger than the half-width, of course this is not the essential difference.
C full-width and half-width of the difference between
The full-width is the width of letters and numbers, such as Chinese characters accounted position word. Half-width ASCII character way to do with the time from the Chinese character input method input alphanumeric characters are half-width.
Appear in the Chinese character input method, input alphanumeric default to half-width, but the punctuation is the default for the whole angle corresponding toolbar button mouse click input method.
D "full" and "half-width":
The whole angle: means in GB2312-80 (information exchange · basic set of Chinese ideograms coded character set ") in a variety of symbols.
Half-width: refers to the various symbols of the ASCII code of the English document.
Software testing methods and rules
Hump naming rules: first letter lowercase, followed by the beginning of each word uppercase money (java all the methods and properties named in camel)
Pascal naming convention: the first letter capitalized, behind the beginning of each word uppercase Money (C # inside classes, methods, properties, java inside class named)
The variable type character dMoney Hungarian rule: the basis of Pascal naming rules, plus a lowercase
static: static belong to the class of all owners do not need to instantiate, only a small memory consumption during the execution of a program in memory assigned space
Non-static: have to belong to the object, you need to instantiate
Person p = new Person ();
Person p1 = new Person ();
Write a police class, there is a method of training and duty, a police officer the name of an attribute of police officers a property number, write a test class
Assignment by the police number and name call training and duty
JAVA inside strict case-sensitive
public-modified class, the class name and the file name must be exactly the same
Singleton Pattern
If a class constructor is private, outside the class can not directly call the constructor to create methods
Outside the class and can not by the object. Way to call
When a class can not be instantiated, we can only call it what method? Can only call the static method
Class class name {
Private constructor
Static public method static
Only such internal call a private constructor and the instance should return out, returned instance must be a member variable
}
Thread safety issues? For inside the static method to instantiate this variable may still exist, when multiple threads at the same time to get the object, creating multiple objects
The simplest single cases of how to achieve
public class PoliceMan {
/ / Constructor private
private PoliceMan () {
}
/ / Member variables private, static, static code is executed only once
private static PoliceMan onePolice = new PoliceMan ();
/ / Static method Total, returns an instance of the private member variables
public static PoliceMan getInstance () {
return onePolice;
}
}