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What does .class mean in Java?
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And how does Android handle new Intent(this, Activity.class? Will it try to find out class Activity by comparing each class?
– Zhipeng YANG
Sep 21 '16 at 13:28
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belongs_to through associations
...ave a :through option. You're better off caching the question_id on Choice and adding a unique index to the table (especially because validates_uniqueness_of is prone to race conditions).
If you're paranoid, add a custom validation to Choice that confirms that the answer's question_id matches, but ...
What does the arrow operator, '->', do in Java?
...ssions is
(Parameters) -> { Body } where the -> separates parameters and lambda expression body.
The parameters are enclosed in parentheses which is the same way as for methods and the lambda expression body is a block of code enclosed in braces.
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Upload file to FTP using C#
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The existing answers are valid, but why re-invent the wheel and bother with lower level WebRequest types while WebClient already implements FTP uploading neatly:
using (var client = new WebClient())
{
client.Credentials = new NetworkCredential(ftpUsername, ftpPassword);
clien...
Load dimension value from res/values/dimension.xml from source code
...t is.
I have two dimension.xml files, one in /res/values/dimension.xml and the other one in /res/values-sw360dp/dimension.xml .
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Force R to stop plotting abbreviated axis labels - e.g. 1e+00 in ggplot2
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Just an update to what @Arun made, since I tried it today and it didn't work because it was actualized to
+ scale_x_continuous(labels = scales::comma)
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Programmatically set height on LayoutParams as density-independent pixels
...? It looks like the height/width, when set programmatically, are in pixels and not dp.
5 Answers
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A good solution for await in try/catch/finally?
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You can move the logic outside of the catch block and rethrow the exception after, if needed, by using ExceptionDispatchInfo.
static async Task f()
{
ExceptionDispatchInfo capturedException = null;
try
{
await TaskThatFails();
}
catch (MyExceptio...
Why can't I call read() twice on an open file?
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Calling read() reads through the entire file and leaves the read cursor at the end of the file (with nothing more to read). If you are looking to read a certain number of lines at a time you could use readline(), readlines() or iterate through lines with for line in ha...
File path to resource in our war/WEB-INF folder?
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There's a couple ways of doing this. As long as the WAR file is expanded (a set of files instead of one .war file), you can use this API:
ServletContext context = getContext();
String fullPath = context.getRealPath("/WEB-INF/test/foo.txt");
http://tomcat.apache.org/tomcat-5.5-doc/servleta...