stackoverflow

Today in GitHub saw an open source project, which is in the collation and translation StackOverflow on the hot questions, the first question is in the discussion i = j is equal to I = i + j; The conclusion is not equal to. The argument is as follows: if int i = 9; Long j = 11; Then i = i + j cannot compile, but i = j can compile. The description i + j is actually equivalent to i= (type of i) (i + j); Refer to Official document: http://docs.oracle.com

the parameters, check the code for some object life cycle too long, hold the state too long, reduce the memory consumption of the program run time. virtual machine stack and local method stack Overflow The hotspot does not differentiate between the virtual machine stack and the local method stack, and the stack capacity can only be set by the-XSS parameter. StackOverflow: Thread request has a stack depth exceeding the maximum allowable depth OutOfMem

Here is my collection of some Python tips, is mainly a number of practical functions, suitable for a certain basis of children's shoes to watch (will not specifically describe the use of the standard library functions). One, function-type programming Functional programming is very handy for working with data. (If you have a pipe operator | or a chain call of Java, super cool!) But Python doesn't have any. Need to use third party libraries)1. Group/group A common operation in data processing i

Tags: gdb debug Stack Overflow compilationSummary:This article mainly demonstrates the stack overflow under the Linux platform, first the overflow attack according to the theory to the example code, the result is the overflow attack, but it is different from the idea, then uses the GDB debugging tool to carry on the thorough analysis to the occurrence accident.Platform for testing:1. Ubuntu 9; GCC 4.4.1; Gdb 7.0-ubuntu2. The Ubuntu system is installed on virtual box 3.2.8 VMS;The sample code is

1. The simplest memory overflowpublic class Heapoom { heapoom[] testlist= new heapoom[100000]; public static void Main (string[] args) { list　　2, virtual machine stack and local method stack Overflow (-XSS: stack memory capacity)Two kinds of exceptions:A Stackoverflowerror exception is thrown if the thread requests a depth greater than the maximum allowed depth for the virtual machine.Throws a OutOfMemoryError exception if the virtual machine cannot request enough memory space on th

BackgroundThe Jqgrid display is used in the system and now the amount of data to be processed 10w+Present situationUsing the full query, the query to the 10w+ data into the DataTable, each page refresh takes more than 9 seconds, and passed to another DLL to handle some things. Occasionally stackoverflow anomalies occur, but the frequency is large.AnalysisTwo existing problems need to be addressed: Performance issues

First, Introduction When I recently configured the work environment for a new notebook, after downloading and installing VS2017, I locally Clone the Leetcode warehouse that I anchored on GitHub. When I edit something in this workspace and then want to commit (git push), a git for window pops up asking me to enter GitHub's account number and password, and at this point I didn't notice that I entered the wrong account and password, and the following error occurred: The problem comes, of course,

Browse stackoverflow today and find an interesting question: whichwasmorepreferableasperformancewiseandwithouterrorcausetodeletealltherowfromtableinsqliteinandroid. DELETEQUERYORDROPTABLEANDRE-GENERATETHETABLE? And remove sqlite Today, I found an interesting problem through stackoverflow: which was more preferable as performance wise and without error cause to delete all the row from table in sqlite in andr

!StackOverflow on this issue, someone suggested:Maybe need to clear the delegate for your Uiimagepickercontroller? Delegates can prevent objects from being properly deallocated.So I added a pick.delegate = nil in the callback function that finished selecting the photo or deselecting the photo.......However, the problem still exists!Then, StackOverflow, someone said,It ' s A bug in the SDK.Then, under the of

accurate tutorials on the Internet ). If you do not understand the knowledge point, you can find it. If you cannot find it, you can ask. If you really cannot ask, you can skip it. Stackoverflow is recommended for many people to ask questions. However, in English, segmentfault is recommended. Learning English at the beginning is not very relevant. When you realize that English is important, it is not too late to learn it. You have not realized that it

= new Testbean (); Testbean.setid (1); Test.setmodel (Testbean); Test.setpageno (1); Test.setpagenum (1); System.out.println (jsonobject.tojsonstring (test)); String json = "{\" model\ ": {\" id\ ": 1},\" pageno\ ": 1,\" pagenum\ ": 1}"; New Typereference System.out.println (Clazz.getmodel (). GetClass ()); } So we can't use the @requestbody, so we should use the most basic KV structure for the reference.Fastjson Circular Reference problemsWhat are circular refe

Introduction In C ++, pod is an extremely important concept. To understand the pod type, we must first understand the aggregate type. According to the answer in stackoverflow, we will give a comprehensive explanation of the aggregate type.Definition of aggragates C ++ standard (C ++ 03 8.5.1§ 1: An aggregate is an array or a class (Clause 9) with no user-declared Constructors (12.1), no private or protected non-static data members (clause 11 ), no

I have been in contact with website production and operation for nearly nine years. I have never thought of building a Q A community. In fact, this is a good idea, but it has been a leader, this is a list of programs used to build a platform for a free Q A website.Quora, Stackoverflow, Yahoo Answers, zhihu, Ah annoying sns q A websites. Xiqiao is a web designer I like very much. Today, I got up early to take a film. When I came back, I looked at hi

listening. The specific practices will be detailed later. At the same time, we should begin to look at some of the latest technical documents in the industry. These may not have been published yet, or there may be some free PDF files. In any case, you may also find about 5 Documents, which of the following are MongoDB, neo4j, and node. JS, angularjs, and so on. Let's take a closer look at it and make a system trainer. Because there are still few new technical documents and there are not many th

Similar to RubyChina, there are targeted communities for you to learn. My community here is different from sdks and stackoverflow. You need to ask questions and answers from others. J2ee? C ++? Are there similar communities or forums? Similar to RubyChina, there are targeted communities for you to learn. My community here is different from sdks and stackoverflow. You need to ask questions and answers from o

This article by Bole online-lone lonely hao days translation. without permission, no reprint!English Source: Androiddesignpatterns. Welcome to join the translation team.The following stack traces and exception codes have been confusing StackOverflow since the initial release of Honeycomb. 12345 java.lang.IllegalStateException:Can not perform this action after onSaveInstanceStateat android.support.v4.app.FragmentManagerImpl.checkStateL

{Code ...} if the above error is reported, stackOverflow has this problem. The referenced controller can be changed to extendsCI_Model. but I was about to modify decontroller and could not do this. how can I solve this problem? Between the referenced controller and the referenced controller... Unable to locate the specified class: Session.php If the above error is reported, stackOverflow has this problem. T

My question asked by zookeeper on StackOverflow is to be answered. Stackoverflow. comques... a Package model with many Step models. There are two types of Step fields: tinyint status field and timestamp field. False configuration of a PackageA,... I just asked a question on StackOverflow, please answer. Http://stackoverflow.com/ques... A Package model has many S

These useful python snippets I've listed have saved me a lot of time, and I hope they'll save you some time as well. Most of these fragments come from finding solutions, finding blogs and StackOverflow answers to similar questions. All of the following code snippets have been tested in Python 3.Calling an external command in PythonSometimes you need to invoke an external command from the shell or command prompt, which is easy to implement in Python by

This is a function that I have never used. Most people do not need to use this function, so few people know its usefulness. Today, I read some related knowledge on stackoverflow and share it with you. Let's take a look at the official explanation: interrupt the execution of the compiler. It is often used to embed data in PHP scripts, similar to installation files. You can use constant _ COM This is a function that I have never used. Most people do not