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Best way to concatenate List of String objects? [duplicate]
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Yup, every time: Bloch, "Effective Java", Item 47: "Know and use the libraries". The Apache Commons libraries should be the first thing to put in your build file (hopefully Gradle). As Item 47 concludes: "To summarize, don't reinvent ...
DateTime vs DateTimeOffset
Currently, we have a standard way of dealing with .NET DateTime 's in a TimeZone aware way: Whenever we produce a DateTime we do it in UTC (e.g. using DateTime.UtcNow ), and whenever we display one, we convert back from UTC to the user's local time.
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How can I use a file in a command and redirect output to the same file without truncating it?
...ash processes the redirections first, then executes the command. So by the time grep looks at file_name, it is already empty. You can use a temporary file though.
#!/bin/sh
tmpfile=$(mktemp)
grep -v 'seg[0-9]\{1,\}\.[0-9]\{1\}' file_name > ${tmpfile}
cat ${tmpfile} > file_name
rm -f ${tmpfile...
CSS: How to position two elements on top of each other, without specifying a height?
...height back. But how can you do that if you don't know the height ahead of time? Well, if you know what aspect ratio you want to give the container (and keep it responsive), y
What is the difference between a URI, a URL and a URN?
...se are much more regulated and intended to be unique across both space and time.
Because I currently share this name with other people, it's not globally unique and would not be appropriate as a URN. However, even if no other family used this name, I'm named after my paternal grandfather, so it sti...
泰迪熊为什么叫泰迪 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...配地瓜）。于是塔夫托说，“for possum first, last, and all the time”，这句话没看懂。但是塔夫托因为这句话被政治漫画家绘作一只负鼠，名为 Billy Possum（比利鼠）。
由于罗斯福和泰迪熊的巨大成功，玩具商们看准了这次商机，制...
What does the plus sign do in '+new Date'
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But like why wouldn't you use the defined getTime method on the date object?!
– tkone
Aug 23 '12 at 21:36
31
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Creating instance of type without default constructor in C# using reflection
...g System.Linq;
using System.Text;
using System.Reflection;
using System.Runtime.Serialization;
namespace NoConstructorThingy
{
class Program
{
static void Main(string[] args)
{
MyClass myClass = (MyClass)FormatterServices.GetUninitializedObject(typeof(MyClass)); ...
SharedPreferences.onSharedPreferenceChangeListener not being called consistently
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this accepted answer is ok, as for me it is creating new instance each time the activity resumes
so how about keeping the reference to the listener within the activity
OnSharedPreferenceChangeListener myPrefListner = new OnSharedPreferenceChangeListener(){
public void onSharedPreferenceC...
Where is android studio building my .apk file?
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Can't believe I wasted so much time just because I forgot that just because Android Studio doesn't always show you all the directories...
– Jon McClung
Dec 19 '16 at 3:42
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