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serialization - Managing several versions of serialized Java objects

Lets say that I have a program that for some reason need to handle old versions of serialized objects. Eg: when ... ? What's the best strategy? See Question&Answers more detail:os...

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

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java - Are volatile variable 'reads' as fast as normal reads?

I know that writing to a volatile variable flushes it from the memory of all the cpus, however I want to ... fetched from the main memory? See Question&Answers more detail:os...

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

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variable length - javascript object max size limit

I'm trying to pass a JavaScript variable to the server-side using jquery.ajax method. I'm trying to create a ... there is some limit about that. See Question&Answers more detail:os...

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

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Usage of _ in scala lambda functions

Can anyone please explain me why I can do: a.mapValues(_.size) instead of a.mapValues(x => x.size) but I can't ... of a a.groupBy(x => x) See Question&Answers more detail:os...

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

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python - OSError: Initializing from file failed on csv in Pandas

So far pandas read through all my CSV files without any problem, however now there seems to be a problem.. When ... ones. The filesize is 10MB. See Question&Answers more detail:os...

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

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php 5.3 - PHP Composer behind http proxy

I use composer on a network where the only way to access the internet is using HTTP or socks proxy. I have ... I use composer behind this proxy? See Question&Answers more detail:os...

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arrays - How to use realloc in a function in C

Building on what I learned here: Manipulating dynamic array through functions in C. void test(int data[]) { ... is just a simplified example. See Question&Answers more detail:os...

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

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AngularJS watch DOM change

I have one auto-carousel directive which iterates through the linked element's children. The children however are not ... and not what I need. See Question&Answers more detail:os...

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

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html - Handling "onclick" event with pure JavaScript

This is really straight forward but I'm still fairly new to JavaScript and just found JSFiddle. I'm trying ... jsfiddle.net/Arandolph0/E9zvc/3/ See Question&Answers more detail:os...

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html - set css border to end in a 90 instead of a 45 degree angle

I have a div with different colors for both the border-bottom and border-right properties. So they are ... 90 degree angle separator-line? See Question&Answers more detail:os...

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Extract last word in string in R

What's the most elegant way to extract the last word in a sentence string? The sentence does not end with a ... exists, that is also fine. See Question&Answers more detail:os...

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language agnostic - What is the difference between IF-ELSE and SWITCH?

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java - How to perform a non-polymorphic HQL query in Hibernate?

I'm using Hibernate 3.1.1, and in particular, I'm using HQL queries. According to the documentation, Hibernate ... an option. Thanks in advance! See Question&Answers more detail:os...

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

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java - How to Cache InputStream for Multiple Use

I have an InputStream of a file and i use apache poi components to read from it like this: POIFSFileSystem ... problems when dealing with files. See Question&Answers more detail:os...

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

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android - Determining if an Activity exists on the current device?

Is there a way to check and see if an Activity exists on your device? If I have a youtube video link I ... startActivity() doesn't throw it. See Question&Answers more detail:os...

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

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Convert column to row in Python Pandas

I have the following Python pandas dataframe: fruits | numFruits --------------------- 0 | apples ... . Pandas newbie, so all help appreciated. See Question&Answers more detail:os...

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reactjs - Differences between creating a new class to using export const

Setup: BabelJS (es2015, react, stage-1) Webpack React / redux New to CommonJS and ES6. I know the ... and would appreciate your input. See Question&Answers more detail:os...

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

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python: restarting a loop

i have: for i in range(2,n): if(something): do something else: do something else i = 2 **restart the ... a way to restart that loop? Thanks See Question&Answers more detail:os...

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

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css - Remove "whitespace" between div element

This is my HTML code <div id="div1"> <div></div><div></div><div></div><br/><div></div><div></div><div ... Thanks!( I'm not good at English ...) See Question&Answers more detail:os...

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

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security - Is there a way to force apache to return 404 instead of 403?

Is there a way how I can configure the Apache web server to return a 404 (not found) error code instead ... accessed does in fact exist. See Question&Answers more detail:os...

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

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r - Merge many data frames from csv files, when ID column is implied?

I'd like to merge a bunch of data frames together (because it seems many operations are easier if you're ... Is there a more elegant approach? See Question&Answers more detail:os...

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

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How to call one android application from another android application

I want to call one android application from another application I have tried some examples, but they are ... /files/Application1.apk"; See Question&Answers more detail:os...

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

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model view controller - No Spring WebApplicationInitializer types detected on classpath

My Eclipse project is suddenly no longer deploying properly. I can't trace it to any particular change I've ... up would be greatly appreciated. See Question&Answers more detail:os...

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

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javascript - Playing html5 audio in android browser

I have a javascript that plays audio in the browser, using the html5 <audio> tag. It works fine in the ... would be grateful for any ideas! See Question&Answers more detail:os...

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

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javascript - Add names of the states to a map in d3.js

I am using albersUSA projection to display a map. I want to add the name of the states to each state. This is what I tried ... (d)[1]; }); }); } See Question&Answers more detail:os...

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

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How to prevent Ajax/javascript result caching in browsers?

How to prevent browsers from caching Ajax results? I have and event triggered Ajax script the displays results only when ... and Firefox 3.0.10 See Question&Answers more detail:os...

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

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SQL Server (TSQL) - Is it possible to EXEC statements in parallel?

SQL Server 2008 R2 Here is a simplified example: EXECUTE sp_executesql N'PRINT ''1st '' + convert(varchar, ... without wait / in parallel? See Question&Answers more detail:os...

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

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compilation - C function defined as int but having no return statement in the body still compiles

Say you have a C code like this: #include <stdio.h> int main(){ printf("Hello, world! "); printf("%d " ... omission, and where did 14 come from? See Question&Answers more detail:os...

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

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