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TwoSo just the two ways we have to give business, main and sub plus synchronized.At this point, at least two threads (parent thread Cheng Zi threads) do not interfere (mutually exclusive), but it is also possible that the parent thread runs two laps (output 20 lines of code) in other words, we let two threads mutually exclusive, but cannot coordinate the communication. (They have no alternating output!)Step threeClass business{ Private Boolean shouldsub=true; This variable name is ve

? There is a memory leak, a CPU utilization level, and how the application is handled without responding. Have you encountered any technical problems in the development? How to solve the If there is a billions of whitelist, high concurrent queries are required daily during the day and need to be updated at night to design this feature. How Sina Weibo is enabling Twitter to Subscribers How Google returns the search results to the user within a second. 12306 how the booking sys

up a blocked thread27. Talk about the difference between NIO and IOWhat are the Nio,bio,aio in 28.Java?29. What is Idempotent30. How many ways to terminate a thread? Why is the terminating thread tag variable a valotile type?31.Java New Generation, the old age, lasting generations, what is stored?Does 32.switch work on a byte, can it function on a long, or does it work on a string?33. Explain what is AOP (aspect-oriented programming)?34. Oracle Index classification, and pros and cons35. Handwri

concepts and mechanisms of the JVM, such as the Java class loading mechanism, common version of the JDK embedded class-loader, such as bootstrap,application, and extension class-loader, class loading approximate process; Load, verify, connect, Initialize (Zhou Zhiming Tools such as the JDK or Java domain, such as compilers, runtime environments, security tools, diagnostic and monitoring tools. These basic tools are the guarantee of daily daily work efficiency. And for other language platforms,

detect. The direct hold of the session is not supported, but can be solved by Ip_hash. 1 , the software itself does not support regular expression processing, can not do static and dynamic separation, and now many sites in this area have a strong demand, this is the advantage of nginx/haproxy+keepalived. 2 , if the site is a relatively large application, lvs/dr+keepalived implementation is more complex, especially after the WindowsServer machine, if the implementation and configuration and

execution, and display the information; #!/bin/bashfunctiondisk () { read-p "inputthedeviceyouwanttoformat." dev read-p "Waring!itwillbeformatthedevice $dev, andthedataon $dev willbedeleted,areyousuretodothis?y/n "kwhile:;doif [ $k == ' n ' -o $k == ' n ' ];then exitelif [ $k == ' y ' -o $k == ' y ' ];then ddif=/dev/zeroof= $dev bs=512count=1 n1= ' echo$? ' if[ $n 1-ne0];then return67 else echo-e "n\np\n1\n1\n+100m\nn\np\n2\n\n+1g\nw\nquit\n" |fdisk $dev n2= ' echo$? ' if[ $n 2-ne0];then r

original library functions of the Berkeley socket, a set of functions for Windows has been extended to enable programmers to fully utilize the Windows Messaging mechanism for programming. more and more network applications are now implemented through sockets for process communication, mainly because sockets is much better cross-platform than other IPC mechanisms, and Winsock 2.0 supports not only the TCP/IP protocol, but also other protocols such as IPX. The only drawback of sockets is that it

software, switchesApache 2.2.xTomcat 5.5.XDatabase systemUp to 8 Internet IP addresses, please design a system:1, the use of dual Apache web server front-end;2, the use of the AJP connected to the 3 Tomcat application server, these tomcat is configured to cluster, it is necessary to consider the Apache to the back end of the allocation, the allocation of a fully balanced approach, configure the use of cookies to achieve session stickness;3.1 database servers only Tomcat needs to be connected an

shortcut under Windows.Can delete the original file and save the connection file, there is no prevention of accidental deletion function.This paragraph of the content is too abstract, but also the node is an array, I have tried to popular again, and not good examples for demonstration. If you are still foggy, I have no way, only first remember, in the future in the practical application of slowly experience, understanding. This is also my study of a method.Third, Mount file systemAs we know fro

differentThe same method handles different parameter lists (static polymorphism) according to the different input dataMethod overridesSubclasses override parent class methods with different implementations of the same parameters (dynamic polymorphism)Method Name parameter return type consistentMethod modifies a modifier that is greater than the parent classA new exception cannot be present, a broad exception than the parent classSuper () Call method of parent classThe final method cannot be ove

int hi = numbers.length-1; Set the initial value int mi = lo; Make sure that the LO is in the previous ordered part, HI is in the latter part of the order while (Numbers[lo] >= Numbers[hi]) {//When the processing range has only two data, the latter result is returned Because Numbers[lo] >= Numbers[hi] is always true, the latter result corresponds to the smallest value if (Hi-lo = = 1) {return Numbers[hi]; }//Take the middle position mi = lo + (Hi-lo)/2;

decompress files of the same typeC tar archived and compressed files can be decompressed by the gzip commandD tar command file After archive is also a compressed file113. Not the shell has the functionality and characteristics of C.A pipeline B Input Output redirect C Execute background process D handler command114. The following is a fruit operation on the shell variable, correct: C.A assigns a value to a variable: $FRUIT =apple B Displays the value of the variable: fruit=appleC displays the v

kind of request forwarding, when a single hyperlink, the browser's address bar will appear the current request address, if the server-side response is completed, found that the address bar address changed, it is proved that the indirect request forwarding. Conversely, if the address does not change, it represents a direct request forward or no forwarding.Q: What are the principles and differences between direct forwarding and indirect forwarding?A: Forward and redirect represent two kinds of re

.char variable?Save Unicode to save Chinese characters20. Start a thread with run () or start ()?Start ();Run () put the executed code insideThird, intermediate simple answerWhat is the difference between 21.sleep () and wait ()?Sleep to the time to wake upWaiting to wake up22.JDBC How do transactions work?Set JDBC Auto-commit false to open transactions after multiple transactions commit exception rollback rollbackHow do I access the database in 23.Java?Register driver Get ConnectionmanageObtain

function name, and the variable defined in the if is equivalent to a global variable.2.function aaa () { var a = 1; Console.log (a);}console.log (a); AAA ();This situation prints ' a undefined ', and the function aaa () is no longer executed because the error above will affect the execution of the following function.3, how to let the error does not affect it, we can use try Catchfunction aaa () {var a = 1; Console.log (a);} Try { console.log (a);} Catch (e) {}aaa ();Use a try catch to wrap

variables, and objects are always allocated on the heap. Stacks are usually smaller than heaps and are not shared across multiple threads, and the heap is shared by all threads of the entire JVM.Stacks: Some of the basic types of variables defined in the function and the reference variables of the objects are allocated in the stack memory of the function, and when a variable is defined in a block of code, Java allocates the memory space for the variable in the stack, and when the scope of the v

let me say the details (I too, the details I still not clear)Handwriting Code Print DiamondThree-side HR:How is the interviewer in frontSay about the previous internship of the company, why do not continue in that internship, before the company good, advantages and disadvantages, how long can internship, internship how longYour own plan.What's the problem? I took a look and asked if I could be a positive.There are some details forget, hope to help everyone!LookenThis article originates from the

value to the after node of the head to prevent null pointer exceptions from subsequent operationsTail.before = head;//assigning values to tail's before nodes to prevent null pointer exceptions in subsequent operations } Public voidput (k K, v V) {cachenode node=Caches.get (k); if(node = =NULL) { if(Currentcachesize >=maxcapacity) {Caches.remove (tail.before.key);//eliminate the tail elementsRemovelast (); } node=NewCachenode (); Node.key=K; Currentcachesize++; } node.value=v;

);2, Student s first in the stack memory to open up the stack memory space, create a student object, the heap memory needs to request heap memory space;3, through the non-parametric construction method to the Student class object default initialization;4, by assigning values to the member variables, the object is displayed to initialize;5, the display initialization is complete, after the whole object is created, the object is allocated the memory space address value;6, find the corresponding ob