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Uses for Optional
...sing Optional, however this lack of rigour should be backed by decent unit tests.
public @Nullable Foo findFoo(@NotNull String id);
public @NotNull Foo doSomething(@NotNull String id, @Nullable Bar barOptional);
public class Book {
private List<Pages> pages;
private @Nullable Index ind...
Spring MVC: How to perform validation?
...r controller : very useful, because most validators are singletons + unit test mocking becomes easier + your validator could call other Spring components.
Method 3 :
Why not using a combination of both methods? Validate the simple stuff, like the "name" attribute, with annotations (it is quick to ...
var functionName = function() {} vs function functionName() {}
...rwritten without any problems just like a variable value, e.g.:
function test () {}
test = null;
Another obvious difference between your two examples is that the first function doesn't have a name, but the second has it, which can be really useful when debugging (i.e. inspecting a call stack).
...
Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?
...ranslating their example to use your construct:
val x = new Slot[String]("test") // Make a slot
val y: Slot[Any] = x // Ok, 'cause String is a subtype of Any
y.set(new Rational(1, 2)) // Works, but now x.get() will blow up
If you feel I'm not understanding your question (a dis...
How to paste yanked text into the Vim command line
...
Yup, works in Linux too. Tested under GNOME in both Vim and GVim.
– Teoulas
Oct 27 '11 at 9:26
...
How to assign colors to categorical variables in ggplot2 that have stable mapping?
... address this is to create a custom manual colour scale as follows:
#Some test data
dat <- data.frame(x=runif(10),y=runif(10),
grp = rep(LETTERS[1:5],each = 2),stringsAsFactors = TRUE)
#Create a custom color scale
library(RColorBrewer)
myColors <- brewer.pal(5,"Set1")
names(myColors)...
Append lines to a file using a StreamWriter
...ved txt file.
using (FileStream zipFS = new FileStream(@"c:\Temp\SFImport\test.zip",FileMode.OpenOrCreate))
{
using (ZipArchive arch = new ZipArchive(zipFS,ZipArchiveMode.Update))
{
ZipArchiveEntry entry = arch.GetEntry("testfile.txt");
if (entry == null)
{
...
What are the big improvements between guava and apache equivalent libraries?
...n in doubt, leave it out". Also, using the @Beta annotation allows them to test some design choices without committing to a specific API.
The design choices mentioned above allow for a very compact API. Simply look at the MapMaker to see the power packed inside a "simple" builder. Other good (albei...
Xcode Project vs. Xcode Workspace - Differences
...tly different versions of an app (iPad/iPhone, different brandings,…) or test cases that naturally need to access the same source files as the app. All these related targets can be grouped in a project. While the project contains the files from all its targets, each target picks its own subset of ...
wget/curl large file from google drive
...ss files (Anyone who has a link can View).
Does not work for directories.
Tested on Google Colab.
Works best on file download.
Use tar/zip to make it a single file.
Example: to download the readme file from this directory
gdown https://drive.google.com/uc?id=0B7EVK8r0v71pOXBhSUdJWU1MYUk
...