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How can I lock a file using java (if possible)

I have a Java process that opens a file using a FileReader. How can I prevent another (Java) process from ... file or vice versa. They are different processes. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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http referer - How reliable is HTTP_REFERER?

I need to check and record the referrer of visitors to my web application. How reliable is using HTTP_REFERER? And are there other alternatives? Question&Answers:os...

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c++ - How to enable C++11/C++0x support in Eclipse CDT?

Eclipse 3.7.1 CDT 1.4.1 GCC 4.6.2 This is an example of a piece of C++11 code: auto text = ... How to make Eclipse stop complaining about these sort of errors? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Using threads to make database requests

I'm trying to understand how threads works in java. This is a simple database request that returns a ResultSet. I'm ... before but I thought it's time for it. Question&Answers:os...

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In C++, what is a virtual base class?

I want to know what a "virtual base class" is and what it means. Let me show an example: class Foo { public: void ... void DoSpecific() { /* ... */ } }; Question&Answers:os...

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android - How to prevent a dialog from closing when a button is clicked

I have a dialog with EditText for input. When I click the "yes" button on dialog, it will ... PositiveButton and NegativeButton for the button on dialog. Question&Answers:os...

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How do I compare two string variables in an 'if' statement in Bash?

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c# - Getting attributes of Enum's value

I would like to know if it is possible to get attributes of the enum values and not of the enum itself? For ... how to get it from the value of the enum. Question&Answers:os...

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javascript - How do I POST urlencoded form data with $http without jQuery?

I am new to AngularJS, and for a start, I thought to develop a new application using only AngularJS. ... , AngularJS would provide this functionality, but how? Question&Answers:os...

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How to include files outside of Docker's build context?

How can I include files from outside of Docker's build context using the "ADD" command in the Docker file? ... . Is there a better workaround for than that? Question&Answers:os...

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What is JavaScript garbage collection?

What is JavaScript garbage collection? What's important for a web programmer to understand about JavaScript garbage collection, in order to write better code? Question&Answers:os...

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Browser detection in JavaScript?

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properties - How to create an object property from a variable value in JavaScript?

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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parsing - How to strip all non-alphabetic characters from string in SQL Server?

How could you remove all characters that are not alphabetic from a string? What about non-alphanumeric? Does ... or are there also more generalizable solutions? Question&Answers:os...

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javascript - How to stop event propagation with inline onclick attribute?

Consider the following: <div onclick="alert('you clicked the header')" class="header"> <span onclick="alert('you ... it does not fire the div's click event? Question&Answers:os...

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node.js - Querying after populate in Mongoose

I'm pretty new to Mongoose and MongoDB in general so I'm having a difficult time figuring out if something like ... the where clause, I get an empty array. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to generate a random integer number from within a range

This is a follow on from a previously posted question: How to generate a random number in C? I wish to be able to ... of a die. How would I go about doing this? Question&Answers:os...

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PHP session lost after redirect

How do I resolve the problem of losing a session after a redirect in PHP? Recently, I encountered a very ... here to help anyone experiencing the same problem. Question&Answers:os...

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javascript - What are the precise semantics of block-level functions in ES6?

I'm trying to wrap my head around the new standardized block-level functions in ES6 by reading ... itself, regardless of actual implementation inconsistencies. Question&Answers:os...

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map function - Prolog map procedure that applies predicate to list elements

How do you write a Prolog procedure map(List, PredName, Result) that applies the predicate PredName(Arg, Res) to the elements of ... , L). L = [9,25,4] ; no Question&Answers:os...

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Git push error '[remote rejected] master -> master (branch is currently checked out)'

Yesterday, I posted a question on how to clone a Git repository from one of my machines to another, How can I ... the local machine). Is that a possible reason? Question&Answers:os...

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c# - DateTime vs DateTimeOffset

Currently, we have a standard way of dealing with .NET DateTime's in a TimeZone aware way: Whenever we produce ... compared to what we have already been doing? Question&Answers:os...

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Why should we typedef a struct so often in C?

I have seen many programs consisting of structures like the one below typedef struct { int i; char k; } ... so often? Any specific reason or applicable area? Question&Answers:os...

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python - Converting unix timestamp string to readable date

I have a string representing a unix timestamp (i.e. "1284101485") in Python, and I'd like to convert it ... TypeError: argument must be 9-item sequence, not str Question&Answers:os...

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How to reload a page using JavaScript

How can I reload the page using JavaScript? I need a method that works in all browsers. Question&Answers:os...

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Changing default encoding of Python?

I have many "can't encode" and "can't decode" problems with Python when I run my applications from the console. But ... it. So what's the best solution for it? Question&Answers:os...

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version control - How can I undo git reset --hard HEAD~1?

Is it possible to undo the changes caused by the following command? If so, how? git reset --hard HEAD~1 Question&Answers:os...

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python - How to drop rows of Pandas DataFrame whose value in a certain column is NaN

I have this DataFrame and want only the records whose EPS column is not NaN: >>> df STK_ID EPS cash STK_ID RPT_Date ... 601939 2.5 NaN How do I do that? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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