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Why does String.valueOf(null) throw a NullPointerException?
... that the most specific method is chosen.
A char[] is-an Object, but not all Object is-a char[]. Therefore, char[] is more specific than Object, and as specified by the Java language, the String.valueOf(char[]) overload is chosen in this case.
String.valueOf(char[]) expects the array to be non-nu...
Select multiple columns in data.table by their numeric indices
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For versions of data.table >= 1.9.8, the following all just work:
library(data.table)
dt <- data.table(a = 1, b = 2, c = 3)
# select single column by index
dt[, 2]
# b
# 1: 2
# select multiple columns by index
dt[, 2:3]
# b c
# 1: 2 3
# select single column by na...
How to debug template binding errors for KnockoutJS?
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If you are using Chrome for development, there is a really great extension (with which I'm not affiliated) called Knockoutjs context debugger that shows you the binding context directly in the Developer Tools' Elements panel.
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Java: Get first item from a collection
...ction<String> strs , how can I get the first item out? I could just call an Iterator , take its first next() , then throw the Iterator away. Is there a less wasteful way to do it?
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How to avoid the need to specify the WSDL location in a CXF or JAX-WS generated webservice client?
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I finally figured out the right answer to this question today.
<plugin>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-codegen-plugin</artifactId>
<version>${cxf.version}</ver...
How to serialize an Object into a list of URL query parameters?
...aroth! I only accepted @patrick's answer above over yours (they are essentially the same) because he was first, I believe. I'm very grateful for your response.
– bobsoap
Jul 4 '11 at 1:06
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Why use 'git rm' to remove a file instead of 'rm'?
...ml
rm 'index.html'
$ git status -s
D index.html
However you can do this all in one go with just git rm
$ git status -s
$ git rm index.html
rm 'index.html'
$ ls
lib vendor
$ git status -s
D index.html
share
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JSON.NET Error Self referencing loop detected for type
I tried to serialize POCO class that was automatically generated from Entity Data Model .edmx and when I used
25 Answers
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How do you underline a text in Android XML?
... sometimes if you are using a custom font. However, underlying programmatically by UnderlineSpan has indeed never failed on me, so I would recommend it as the most reliable solution.
– Giulio Piancastelli
Apr 2 '14 at 18:06
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How to make an alert dialog fill 90% of screen size?
...heme.Dialog, then you wouldn't have to play a guessing game about when to call setAttributes. (Although it's a bit more work to have the dialog automatically adopt an appropriate light or dark theme, or the Honeycomb Holo theme. That can be done according to http://developer.android.com/guide/topi...