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In another thread I stated that I liked to center my GUIs by doing something like this: JFrame frame = new ... true); and inquiring minds want to know why? Question&Answers:os...

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

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70 views

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How can I specify a branch/tag when adding a Git submodule?

How does git submodule add -b work? After adding a submodule with a specific branch, a new cloned repository (after git ... branch? I'm using version 1.6.5.2. Question&Answers:os...

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

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87 views

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javascript - How to update nested state properties in React

I'm trying to organize my state by using nested property like this: this.state = { someProperty: { flag:true } ... doesn't work. How can this be done correctly? Question&Answers:os...

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

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regex - Regular Expressions: Is there an AND operator?

Obviously, you can use the | (pipe?) to represent OR, but is there a way to represent AND as well? ... of a certain phrase, but in no particular order. Question&Answers:os...

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

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55 views

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c# - Converting a String to DateTime

How do you convert a string such as 2009-05-08 14:40:52,531 into a DateTime? Question&Answers:os...

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

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386 views

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java - What is a StringIndexOutOfBoundsException? How can I fix it?

This is my code: private void bringData() { final TextView mTextView = (TextView) findViewById(R.id.textView); // ... but I cannot find out how to fix it. Question&Answers:os...

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

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java - Simple way to repeat a string

I'm looking for a simple commons method or operator that allows me to repeat some string n times. I know I could ... number of places a bug hunter has to look. Question&Answers:os...

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

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318 views

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r - Split data.frame based on levels of a factor into new data.frames

I'm trying to create separate data.frame objects based on levels of a factor. So if I have: df <- data.frame( x ... data.frame. What's the best way to do this? Question&Answers:os...

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

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java - Generating all permutations of a given string

What is an elegant way to find all the permutations of a string. E.g. permutation for ba, would be ... as abcdefgh? Is there any Java implementation example? Question&Answers:os...

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

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datetime - Find objects between two dates MongoDB

I've been playing around storing tweets inside mongodb, each object looks like this: { "_id" : ObjectId(" ... the dates are stored in a specific format? Question&Answers:os...

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

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340 views

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c - Why do I always get the same sequence of random numbers with rand()?

This is the first time I'm trying random numbers with C (I miss C#). Here is my code: int i, j = 0 ... somevalue/*) before the for loop. Can anyone explain why? Question&Answers:os...

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

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html - Flex / Grid layouts not working on button or fieldset elements

I'm trying to center inner elements of a <button>-tag with flexbox's justify-content: center. But Safari does not center ... > <span>Test</span> </p> </div> Question&Answers:os...

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

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121 views

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Deleting an element from an array in PHP

Is there an easy way to delete an element from an array using PHP, such that foreach ($array) no longer includes ... do it, but apparently it does not work. Question&Answers:os...

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

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javascript - Add table row in jQuery

What is the best method in jQuery to add an additional row to a table as the last row? Is this acceptable? $ ... this (such as inputs, selects, number of rows)? Question&Answers:os...

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

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328 views

1 answer

postgresql - How does the search_path influence identifier resolution and the "current schema"

Is it possible to define in which schema new tables get created by default? (Referred by "unqualified table ... they have unqualified names. Is this possible? Question&Answers:os...

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

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197 views

1 answer

c - typedef struct vs struct definitions

This question already has answers here: Question&Answers:os...

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

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70 views

1 answer

How to make an Android Spinner with initial text "Select One"?

I want to use a Spinner that initially (when the user has not made a selection yet) displays the text "Select One" ... what I want. How can I fix this problem? Question&Answers:os...

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

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320 views

1 answer

c# - How can I convert a Unix timestamp to DateTime and vice versa?

There is this example code, but then it starts talking about millisecond / nanosecond problems. The same question is ... .Created = epoch.AddSeconds(value); } } Question&Answers:os...

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

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190 views

1 answer

haskell - What is the monomorphism restriction?

I'm puzzled by how the haskell compiler sometimes infers types that are less polymorphic than what I'd expect, ... in Haskell as discussed in the meta question. Question&Answers:os...

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

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163 views

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html - CSS - Equal Height Columns?

In CSS, I can do something like this: But I've no idea how to change that to something like: Is ... explicitly specifying the height (let the content grow)? Question&Answers:os...

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

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97 views

1 answer

Difference between 'struct' and 'typedef struct' in C++?

In C++, is there any difference between: struct Foo { ... }; and: typedef struct { ... } Foo; Question&Answers:os...

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

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230 views

1 answer

jQuery/JavaScript to replace broken images

I have a web page that includes a bunch of images. Sometimes the image isn't available, so a broken image ... solution, that is, the one provided by Prestaul. Question&Answers:os...

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

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79 views

1 answer

How to check if a String is numeric in Java

How would you check if a String was a number before parsing it? Question&Answers:os...

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

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284 views

1 answer

python - How to find all occurrences of an element in a list

index() will give the first occurrence of an item in a list. Is there a neat trick which returns all indices in a list for an element? Question&Answers:os...

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

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100 views

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c++ - When a function has a specific-size array parameter, why is it replaced with a pointer?

Given the following program, #include <iostream> using namespace std; void foo( char a[100] ) { cout << "foo() ... Why is the strict type-safety of C++ dropped? Question&Answers:os...

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

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158 views

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How to allow only numeric (0-9) in HTML inputbox using jQuery?

I am creating a web page where I have an input text field in which I want to allow only numeric characters like (0,1, ... ) 0-9. How can I do this using jQuery? Question&Answers:os...

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

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169 views

1 answer

php - Grabbing the href attribute of an A element

Trying to find the links on a page. my regex is: /<as[^>]*href=("'??)([^"' >]*?)[^>]*>(.*)</ ... my regex to deal with href not placed first in the a tag? Question&Answers:os...

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

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164 views

1 answer

What is the explanation for these bizarre JavaScript behaviours mentioned in the 'Wat' talk for CodeMash 2012?

The 'Wat' talk for CodeMash 2012 basically points out a few bizarre quirks with Ruby and JavaScript. I have made ... a number from a string results in NaN. Question&Answers:os...

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

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