zen coding

staticpublicclass HumanFactory{ //这里是 publicstaticcreateHuman(Classnull; try{ human = (Human)Class.forName(c.getName()).newInstance(); }catch(Exception e){ System.out.println("人类生产错误"); e.printStackTrace(); } return (T)human;}}2. Upgrade to multiple factory classesWhen we are working on a more complex project, we often encounter an effort to initialize an object, and all product classes are initialized in a factory method, and t

compressed only 30KB, and it does not depend on other libraries.2, through the Angularjs custom Ng-app to guide the Angularjs library.3. Before template rendering, you can use Ng-init to initialize the model name and pass its value through the {{name}} expression.With this very simple example, the Angular JS template system shows some important features. Add dynamic behavior to a static HTML document using custom HTML tags and attributes. Use double curly braces as delimiters for e

the father of PythonNow is better than never. It's better than not doing it now.Although never is often better than *right* now.Although the past is never better than the presentIf The implementation is hard to explain, it's a bad idea.If this implementation is not easy to explain, then it must be a bad idea.If The implementation is easy to explain, it could be a good idea. If this implementation is easy to explain, then it's probably a good idea .namespaces is one honking great idea – let's do

Zen-singleton mode in Design Mode Personal blog this blog address: http://www.sanyinchenblog.com /? P = 233 Singleton mode: Make sure that a class has only one instance, and instantiate it and provide the instance to the entire system. Demo (https://github.com/sanyinchen/UMLDemo) General View (hunger style ): Single sample Common Code Template: public class Singleton{private static final Singleton singleton=new Singleton();private Singleton(){}publ

1. Sort operator+ Plus-Minus* Multiply/except% take-up+ + Plus One-Minus One2. String operators. Represents two strings connected. = indicates that the string on the right side is usually used for loops3. Assignment operators= equals+ = plus the right number equals the assignment-= subtracts the right number and then equals the assignment4. Logical operators equals and two must both be true, true|| Equivalent to or a true, that is trueXOR Logic XOR, one true one false for true! Logic is not true

First, you need to understand what is Sidebox, and Sidebox is a content area that is displayed on the left or right. Of course, you can also open the pull status of Sidebox so that it is displayed anywhere on the webpage. You can set Sidebox by entering the Tools/Layout Boxes Controller in the background. Note that if inclusidebox is enabled, you must manually display it to the template using a piece of code. Otherwise, you will not be able to see any effect.

Beautiful is better than ugly. Beauty is better than uglinessExplicit is better than implicit. clarity is better than obscuritySimple is better than complex. simplicity is better than complexityComplex is better than complicated. complexity is better than clutterFlat is better than nested. Flat is better than nestingSparse is better than dense. spacing is better than compactnessreadability counts. readability is importantSpecial cases aren ' t special enough to break the rules.Although p

Beautiful is better than ugly. Explicit is better than implicit. Simple are better than Complex.complex is better than complicated. Flat is better than nested. Sparse is better than dense. Readability counts. Special cases aren ' t special enough to break the rules. Although practicality beats purity. Errors should never pass silently. Unless explicitly silenced. In the face of ambiguity, refuse the temptation to guess. There should is one--and preferably only one--obvious the-do it. Although th

I. Note->1. #号注释; 2. " To serve as a note; Two. In Python2, as long as there is Chinese, as long as Chinese is part of the program, including annotations, you need to add in the program: #coding =utf-8 or #-*-coding=utf-8-*- Three. Print placeholder input: print ("%d",%age); Print ("%s",%name) Four. Input: Py2:raw_input ("Please enter:") py3:input ("Please Enter:") Input inputs are in the STR type; if it's

does Unicodeencodeerror appear? Since the write method is called, Python will first determine what type of string it is, and if it is str, write directly to the file without coding, because the STR type string itself is a sequence of binary bytes. If the string is a Unicode type, it first calls the Encode method to convert the Unicode string to the binary form of the STR type before it is saved to the file, and the Encode method is encoded using the

First, the concept of entropy coding:The bigger the entropy, the more chaotic.Entropy in Informatics: Used to measure the entropy of messages, and the uncertainty of information The more random and irrelevant information, the higher the entropy Source code theorem: This shows the relationship between the entropy of Shannon and the probability of the source sign. Entropy of information is the lower limit of average code length after lossless

Both arithmetic coding and program encoding are lossless compression. Arithmetic Coding) Arithmetic coding is a lossless data compression method and an entropy encoding method. Different from other entropy coding methods, other entropy coding methods usually divide input mes

commonly used in pixel encoding: 1. pulse Code Modulation (PCM); 2. entropy Coding; 3. run Length Coding; 4. bit Plane Coding (Bit Plane Coding ). Here, we will introduce the Huffman encoding and travel encoding in entropy (taking reading the. PCX file as an example ).The so-called predictive encoding is to remove the

computing Truncation parameter C BS = 4 More Obvious Block Effect More severe filtering is required to remove the block effect. Perform strong filter on the boundary when the following conditions are met: Modify when FilteringP0,P1,P2Pixel value Modify only when weak FilteringP0Pixel value Chapter 2 video encoding standards 1. International Standards Organization ITU (International Telecommunications Union): International Telecommunication Union ISO (International Standardi

Code originThe growth of the coding witnessed the computer by the individual to the collective by the State to the worldFirst, the initial codeThe computer originally coded the concept of the first computer everyone held 0101Second, the following is the origin of the byte"The so-called byte, the original meaning is used to denote a complete character." The initial computer performance and storage capacity are poor, so the general use of 4-bit BCD code

. Indent to a mean of 0 with a variance of 1 For discrete features: binarize Categorical/discrete features: For the discrete feature is basically according to the One-hot (single Hot) coding, the discrete characteristics of how many values, the number of Bellavita to represent the feature. I. What is a single-hot code?Single hot Code, in the English literature is called One-hot code, the intuitive way is how many states have how man

First, the arithmetic coding definition It is a non-grouping coding algorithm. It is based on the whole sequence, using recursive form of continuous coding. Instead of mapping a single source symbol into a code word, the symbol for the entire input sequence is mapped to a small interval within the interval [0 1] on the real axis, and a representativ

Huffman Coding (Huffman coding) is a coding method, and Huffman coding is a variable-length encoding (VLC). Huffman code uses a variable-length coding table to encode a source symbol (such as a letter in a file). The Variable length codi