logic x book

Visibility: Multiple threads can share access and manipulate the same variables, but one thread changes to a shared variable, and the other thread doesn't have to see it right away, or even never see it. Because it involves registers and cache levels.Solution: Using the volatile keyword Using the Synchronized keyword 5, synchronizedSynchronized can be used to modify an instance method of a class (protect this), a static method (a protected class object), a code block (arbitrar

, the whole process is called context switching, which is not only time consuming, but also invalidates many caches in the CPU, which is a cost.Of course, these costs are relatively relative, and these costs are acceptable if the threads actually do a lot of things, but if you just perform the counter++ in the example in this section, that would be too expensive.In addition, if the tasks performed are CPU intensive, that is, the CPU is mostly consumed, it is unnecessary to create a thread that e

(Passwordfield_2.getpassword ()). Trim (); Try{dos.writeutf (phone); Dos.writeutf (password); } Catch(IOException E1) {e1.printstacktrace (); } } Else{javax.swing.JOptionPane.showMessageDialog (logindialog). This, "Input password is inconsistent ..."); System.out.println ("Input password is inconsistent ..."); Passwordfield_1.settext (""); Passwordfield_2.settext (""); } }Else{javax.swing.JOptionPane.showMessageDialog

#!/usr/bin/python#coding: Utf-8Import reZ=0File=open ('/var/log/httpd/access_log ')For I in file:X=re.search (' Firefox ', i)If x:Z+=1File.close ()Print "Number of times:", Z#!/usr/bin/python#coding: Utf-8Import redic={}Data=open ('/var/log/httpd/access_log ')For I in data:m = Re.search (' (firefox|chrome) ', i)If M:Key=m.group ()Dic[key]=dic.get (key,0) +1Print dic#!/usr/bin/python#coding: Utf-8Import redic={}Data=open ('/var/log/httpd/access_log ')For I in data:m = Re.search (' (\d+.) {3}\d+ '

real fake, fake it for real.So what is the result of using and or not combining together? Example:What is the meaning of this phenomenon, just now I said, the logical operation is from the left to the right of the operation, first count not is not the true,true is true meaning, add a not is not true, that is flase, then add a not, and the fake made the real. So the result of not true is true. Well, now that it's out, it's not going to be the back of the operation. So the direct display of a tru

A scenario with Recyclerview nested Recyclerview is used. The first interface of the shopping cart is Recyclerview, and each item contains a store. Use Recyclerview in the item to include multiple items in a store or shop. Realize the idea: Use an interface callback to callback the listener event for a second adapter product selection to the first adapter and then back to mainactivity in the first adapter. Use an interface callback to callback the listener event for the first adapter item to

Author: slightboy, Time: 2006-10-14 Starting in: http://cs.alienwave.cn/Topic/329.aspx See a lot of students permission to judge is to use string and then or split or intercept In fact, to allow/disallow (True/false) This kind of permission, the logical operation is more appropriate Statement: This article is aimed at getting started and for the mastery of the students, if they already understand that can be ignored Perhaps the meaning of the expression is not very clear, please forgive me. In

Author: slightboy See a lot of students permission to judge is to use string and then or split or intercept In fact, to allow/disallow (True/false) This kind of permission, the logical operation is more appropriate Statement: This article is aimed at getting started and for the mastery of the students, if they already understand that can be ignored Perhaps the meaning of the expression is not very clear, please forgive me. Introduction to Logical operators: And:

Find a lot of trees on the internet to achieve, the total feeling is not satisfactory, not the need to reference JS external files using Plug-ins, is the code too much to see the dizzy, in fact, I just want to implement a simple code, logic is not complex tree, crap not to say more directly on the code: 1, first write the CSS style, the required to write the first rendering of the head Copy Code code as follows: 2, in the pa

Charactersystem:damagemanager The public void Setupawake () The rayactive = this. Getcomponent (Figure 7) In the Fpsrayactive component, there is a detailed definition of the Shootray function (Figure 9), in which the public constructor for the damagepackage variable is changed (Figure 10). (Figure 9) (Figure 10) ----------------------------------------------------------------------------- To sum up(Big picture) Controlling the enemy's AI Character control component is the main control of the

Program logic, mainly divided into three kindsSequential structure: executed from front to rear, each statement executed only onceBranch structure: Select a branch by judging the conditionLoop structure: Loop program Statement branching structure if else 1. if (Boolean expression) { conditional execution statement } 2. if () {}else{} 3. if () {}else if () {} 4. if () {}else if () {}else if () {} else{} Switch Determine the condition, mat

if statement to determine: Instance: #!/bin/sh# This A is test ssh scrptecho "Plase input a number:"Read-p A#echo "Your number is ${a}"if [$a = "1"]; Then echo "Linux";elif [$a = "2"]; Then echo "Solaris";else echo "What?";Exitfi; 1 string Judgment STR1 = str2 When two strings have the same content, the length is trueSTR1!= str2 is true when strings str1 and str2 are unequal-N str1 True when the length of the string is greater than 0 (string not empty)-Z str1 True when the length of the string

The Bayes theorem considers P (a| b) is the likelihood that a occurs when B occurs. In reality, event A is affected by multiple events and may also be affected by the last event a itself (feedback). Can be written in artificial intelligence general feedback Formula Y=f (x,y1), where Y1=f (x). It is the foundation of intensive learning and self-learning. An artificial intelligence learning method extracted from Alphago's thesis algorithm The first level of value judgment Important----cream, remo

Recently saw some online analysis of the Sizzle article, on the matching order is often said to use the reverse matching from right to left, but how the specific and not detailed, or as I have several articles before, on the line of code to do a detailed introduction, but the lack of a holistic concept, Here is the jQuery-1.10.2 version of the Sizzle matching logic (precompiled results) to do a whole description, here is not to talk about too much det

Java GIF image save processing logic /** * Save locally uploaded gif * @param inputstream picture Data * @param savepath save path/ public static void Savegifimageinputstream (InputStream InputStream, String savepath) { byte[] data = new Byte[buffer_size]; int len = 0; FileOutputStream fileoutputstream = null; try { FileOutputStream = new FileOutputStream (savepath); while (len = inputstream.read (data))!=-1) { fileoutputs

1. Background knowledge In just the end of the cat Big Data S1 competition, logic regression is common use and the effect of a good algorithm. (1) return Let's say what is regression, for example, we have two types of data, each with 500 points, when we draw these points, there will be a line between the two sets of data, we draw this curve (because it is very likely non-linear), is regression. We use a lot of data to find this line, and to fit the

These days, take over a colleague's code, about the development of micro-letter interface, that a heap of if, see Brother egg pain, this problem is also a lot of beginners easy to make, so specially to write this refactoring. Let's take a look at the problem with this code, if the code block logic in the if else inside is hard to change, making it reusable 0 and difficult to read. Of course, if there are only one or two, or 3, this is not a very good

Label:2013-05-01 Created by BaoxinjianI. Summary Part 1:creating a Logical UML Class ModelStep 1:create the Model ProjectStep 2:set the environment for Class Model diagramsStep 3:create a Class Model DiagramStep 4:enhance the Class ModelOpenpart 2:transforming the Logical Model into Database physical ModelsStep 1:transform the Class model into a Database ModelStep 2:transform Logical Design Using UML StereotypesStep 3:use Custom Primitive TypePart 3:creating a Database Diagram and reversin

MySQL thing implementation syntax1) Begin SQL statement rollback or commitSTART TRANSACTION SQL statement rollback or commit2) Modify the #本文未涉及 that the autocommit auto-commit is turned onPersonal understanding of this logicStart thingsSubmit each SQL, and record the success or not of the submissionMake judgments on all SQL submission resultsIs successful, commit# commits the transaction, and all operations are performedOtherwise (any one execution fails), then rollback. To perform a transactio

And logic, unrelated to statistics, is estimated to be mixed up in different courses. Causality and correlation Eating Breakfast may Beat Teen obesity by observing more than 2000 teenagers over a 5-year period, referring to the "regular breakfast-eating teenager, which has a lower proportion of saturated fat in total calories and more fiber intake", Breakfast rules seem to be more active than not eating breakfast (Breakfast->more active) ", the study