operating system questions and answers

Advanced PHP face questions and partial answers See some advanced PHP interview topics on the web. Nothing to do, got some answers ... may not be very comprehensive, leave this after the spare bar. I. Basic knowledge points1.1 The meaning of several status codes in the HTTP protocol: 503 500 401 403 404 200 301 302 ...200: The request is successful and the reque

Recently read the "30 days of homemade operating system" this book, read the "Load operating system from the boot area" section of the time stuck, first of all my question is this: first, the disk image file img 0x2600 This place to store the name of the operating

modified the title, then update ... set title =? where article_id =? Do not set content =? (large text)(6). When necessary, use a different storage engine. For example, InnoDB can reduce deadlocks. Heap can increase query speed by an order of magnitude8. Talk about transaction processingA example of a $50 transfer to B's account9, apache+mysql+php to achieve maximum load methodSee 7implementation of the text string interception of no garbled method. Mb_substr ()11.Php$empty=‘‘;$null=Null;$bool=

between the two tags, 115. What does the implied object mean? What are the hidden objects?JSP implied objects are some Java objects in the page, and the JSP container allows these Java objects to be used by developers. Developers can use them directly without a clear statement. JSP implicit objects are also called predefined variables. The following lists the implied objects in the JSP page: Application Page Request Response Session exception Out Config

applications. The serial collector is sufficient for most small applications, which require about 100M of memory on modern processors.41. In Java, when can objects be garbage collected?This object can be recycled when the object becomes inaccessible to applications that currently use the object.Is there a garbage collection in the permanent generation of 42.JVM?Garbage collection does not occur in a permanent generation, and if it is permanently full or exceeds the threshold, a full GC is trigg

applications. The serial collector is sufficient for most small applications, which require about 100M of memory on modern processors.41. In Java, when can objects be garbage collected?This object can be recycled when the object becomes inaccessible to applications that currently use the object.Is there a garbage collection in the permanent generation of 42.JVM?Garbage collection does not occur in a permanent generation, and if it is permanently full or exceeds the threshold, a full GC is trigg

;}) jquery or programming needs to remember or say the words you need to know: System Highlight Prominentvisited accessed by active activeFocus Supplier SuppliersCost Scenic LandscapeUnit Unit Volume volumeReply Reply Weight weightIntegral complete daily dailyHotel Notices NoticePlace Places Summary summaryleave leave Select selectionOption Options Methoddomain scope prefix prefixautoload Auto-load timeout timeout settingSetInterval Set

Questions and answers about Linux Command interview Linux Command lines, as well as the use of Linux commands for Linuxshell interaction, are the most attractive part of Linux and one of the most common topics in the interview. In this article, we will ask 10 important questions during the interview, which will certainly broaden your knowledge. 1. How to pause a

Ado.net Quick Start Questions and answers I. Problems in code 1. Why does the pseudo-SqlMapper base class use the abstract class BaseSqlMapper instead of the interface? A: Lou pig also knows that the SqlMapper base class under IBatis is an interface ISqlMapper. But when Lou pig writes code, it finds that generic constraints are written once in the abstract base class, in SqlMapper, do not write any more, bu

.equals (S2));Enter false because S2 is not of type string, and the Equals method of string is type-judged.3. What does the following code enter?"ABC"; String ("abc"); S2.intern (); System.out.println (S1 ==s2); The output False,intern () method returns a reference to the string object from the string pool, but since we have not assigned to S2,S2 no change, if the third line of code is S2 =S2.intern (), enter true.4. The following code will create several string objects.String ("Hello"); Stri

(Address Resolution Protocol)12. What are the IP address encoding components? Answer: an IP address consists of a network number and a host number. However, it is only after bitwise AND top-up with the "subnet mask" that the network bit and host bit are distinguished.13. The user inputs the M and N values. The number of sequential loops starts from 1 to n. This value is output on every count to m until all are output. Write the C program (Joseph's ring problem ). Answer: Circular linked list, w

, which is used for medium-sized and large-scale data applications. The serial collector is sufficient for most small applications, which require about 100M of memory on modern processors.41. In Java, when can objects be garbage collected?This object can be recycled when the object becomes inaccessible to applications that currently use the object.Is there a garbage collection in the permanent generation of 42.JVM?Garbage collection does not occur in a permanent generation, and if it is permanen

applications. The serial collector is sufficient for most small applications, which require about 100M of memory on modern processors.41. In Java, when can objects be garbage collected?This object can be recycled when the object becomes inaccessible to applications that currently use the object.Is there a garbage collection in the permanent generation of 42.JVM?Garbage collection does not occur in a permanent generation, and if it is permanently full or exceeds the threshold, a full GC is trigg

Linux is vast, so that people can always submit different content each time. Our work of The-Tecmint-Team is to provide some unique content for our readers, which is not only useful for their career, but also increases their knowledge. Here, we will try this label: interview Linux is vast, so that people can always submit different content each time. Our "The-Tecmint-Team" job is to provide some unique content for our readers, which is not only useful for their career, but also increases their k

33 common php questions and answers 1. in PHP, the name of the current script (excluding the path and query string) is recorded in the predefined variable (1), and the URL linked to the current page is recorded in the predefined variable (2). The code is as follows:A: echo $ _ SERVER ['php _ SELF ']; echo $ _ SERVER ["HTTP_REFERER"];2. the execution segment will be output (3 ). The code is as follo

69 Classic Spring Noodles Questions and AnswersSpring Overview1. What is Spring?Spring is an open-source development framework for Java Enterprise applications. Spring is primarily used to develop Java applications, but some extensions are for Web applications that build the EE platform. The Spring framework goal is to simplify Java enterprise application development and promote good programming habits through the Pojo-based programming model.2. What

corresponding action, while the user's data to fill the corresponding actionform, and then the Actionform is distributed to action for processing.3.Action automatically calls the Excute method, in which the action takes the user-filled data from the Actionform and invokes the model (JavaBean) for processing, and then displays the results of the processing in a different view (JSP page)struts-config.xml:struts 's configuration file .It says that each user's request is handled and forwarded throu

Questions and answers for exploratory testing This section discusses the concepts and practices of exploratory testing in the form of dialogs. The questioner is a virtual reader of the book, and the respondent is the author of the book. Q:How should we understand "Exploration" in exploratory testing? A:The so-called exploration refers to purposeful roaming, that is, roaming in a space with a mission, but th

multithreaded programs, multiple threads are executed concurrently to improve the efficiency of the program, and the CPU does not go idle because a thread needs to wait for resources. Multiple threads share heap memory, so creating multiple threads to perform some tasks is better than creating multiple processes. For example, Servlets is better than CGI because Servlets supports multithreading and CGI does not support it.How does the volatile keyword work in Java?When we use the volatile keywor

thread in the ready state by dispatching it to occupy the CPU and turn it into a running state. At this point, the system actually executes the thread's run () method.④ Blocking and waking threadsBlocking state (Blocked): A running thread enters a blocking state when it cannot continue running for some reason. These reasons include:(a) When a method of blocking type such as sleep () of a thread object is executed, the thread object is placed in a blo