Recent questions

0 votes

268 views

1 answer

I am a starting Java developer, learning just from internet tutorials. I am learning full screen GUI applications. I ... of Swing things can replace the AWT)? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

100 views

1 answer

How to use Regular Expressions (Regex) in Microsoft Excel both in-cell and loops

How can I use regular expressions in Excel and take advantage of Excel's powerful grid-like setup for ... Right, Instr type commands for similar manipulations. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

86 views

1 answer

java - How do servlets work? Instantiation, sessions, shared variables and multithreading

Suppose, I have a webserver which holds numerous servlets. For information passing among those servlets I am ... , what happens to the instance variables? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

97 views

1 answer

How do I properly compare strings in C?

I am trying to get a program to let a user enter a word or character, store it, and then print it ... original (input). Am I comparing the two incorrectly? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

178 views

1 answer

python - WebDriverWait not working as expected

I am working with selenium to scrape some data. There is button on the page that I am ... self.wait_for_elem_xpath(xpath = select_all_performance).click() Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

197 views

1 answer

java - Int division: Why is the result of 1/3 == 0?

I was writing this code: public static void main(String[] args) { double g = 1 / 3; System.out.printf("%.2f", ... Why is this, and how do I solve this problem? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

191 views

1 answer

How can I convert ereg expressions to preg in PHP?

Since POSIX regular expressions (ereg) are deprecated since PHP 5.3.0, I'd like to know ... to preg_match Changing ereg_replace to equivalent preg_replace Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

153 views

1 answer

javascript - .prop() vs .attr()

So jQuery 1.6 has the new function prop(). $(selector).click(function(){ //instead of: this.getAttribute('style ... ="color: red;background: orange;">test</div> Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

104 views

1 answer

python - How to execute a program or call a system command?

How do you call an external command (as if I'd typed it at the Unix shell or Windows command prompt) from within a Python script? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

552 views

1 answer

c# - How do I update the GUI from another thread?

Which is the simplest way to update a Label from another Thread? I have a Form running on thread1, and from that I' ... of thread2's work. How could I do that? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

94 views

1 answer

r - How do I make a list of data frames?

How do I make a list of data frames and how do I access each of those data frames from the list? For example, how can I put these ... 3, 2, 1), y2 = c(6, 5, 4)) Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

102 views

1 answer

android - Strange OutOfMemory issue while loading an image to a Bitmap object

I have a ListView with a couple of image buttons on each row. When the user clicks the list ... : DEBUG/skia(4204): xxxxxxxxxxxxxxxxxxxx allocPixelRef failed Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

122 views

1 answer

How do I loop through or enumerate a JavaScript object?

I have a JavaScript object like the following: var p = { "p1": "value1", "p2": "value2", "p3": " ... value pairs and if possible I want to avoid using eval. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

447 views

1 answer

html - Image inside div has extra space below the image

Why in the following code the height of the div is bigger than the height of the img ? There is a gap below the image ... ://i.imgur.com/RECDV24.jpg" /> </div> Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

234 views

1 answer

How to deal with floating point number precision in JavaScript?

I have the following dummy test script: function test() { var x = 0.1 * 0.2; document.write(x); } test(); Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

341 views

1 answer

datetime - How to calculate the difference between two dates using PHP?

I have two dates of the form: Start Date: 2007-03-24 End Date: 2009-06-26 Now I need to find the difference ... months and 2 days How can I do this in PHP? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

113 views

1 answer

javascript - How do I return the response from an Observable/http/async call in angular?

I have service which returns an observable which does an http request to my server and gets the data. I want ... call? post but couldn't find a solution Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

360 views

1 answer

regex - What special characters must be escaped in regular expressions?

I am tired of always trying to guess, if I should escape special characters like '()[]{}|' etc. when ... regexp type, like PCRE, POSIX or extended regexps? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

192 views

1 answer

memory management - What and where are the stack and heap?

Programming language books explain that value types are created on the stack, and reference types are created on the ... each of them? What makes one faster? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

317 views

1 answer

rest - HTTP GET with request body

I'm developing a new RESTful webservice for our application. When doing a GET on certain entities, clients can ... https://www.rfc-editor.org/rfc/rfc2616 Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

227 views

1 answer

java - How can I fix 'android.os.NetworkOnMainThreadException'?

I got an error while running my Android project for RssReader. Code: URL url = new URL(urlToRssFeed) ... .NetworkOnMainThreadException How can I fix this issue? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

70 views

1 answer

javascript - Dynamically access object property using variable

I'm trying to access a property of an object using a dynamic name. Is this possible? const something = { bar ... is to access something.bar, getting "Foobar!" Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

186 views

1 answer

javascript - What do querySelectorAll and getElementsBy* methods return?

Do getElementsByClassName (and similar functions like getElementsByTagName and querySelectorAll) work the same as getElementById or ... ).style.size = '100px'; Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

103 views

1 answer

Is storing a delimited list in a database column really that bad?

Imagine a web form with a set of check boxes (any or all of them can be selected). I chose to save them in ... with, one of them is the topic of this question. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

290 views

1 answer

c++ - Why should I not #include <bits/stdc++.h>?

I posted a question with my code whose only #include directive was the following: #include <bits/stdc++.h> My teacher ... I was informed that I shouldn't. Why? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

80 views

1 answer

c++ - Undefined behavior and sequence points

What are "sequence points"? What is the relation between undefined behaviour and sequence points? I often use funny and ... by those who came up with the idea.) Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

397 views

1 answer

jquery - Why does my JavaScript code receive a "No 'Access-Control-Allow-Origin' header is present on the requested resource" error, while Postman does not?

Mod note: This question is about why XMLHttpRequest/fetch/etc. on the browser are subject to the Same Access ... (xhr.responseText); alert(textStatus); }); Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

117 views

1 answer

javascript - Why does Date.parse give incorrect results?

Case One: new Date(Date.parse("Jul 8, 2005")); Output: Fri Jul 08 2005 00:00:00 GMT-0700 (PST) Case Two ... 00 GMT-0700 (PST) Why is the second parse incorrect? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

Categories

Just Browsing Browsing

Most popular tags