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How to avoid “if” chains?
...
You can use an && (logic AND):
if (executeStepA() && executeStepB() && executeStepC()){
...
}
executeThisFunctionInAnyCase();
this will satisfy both of your requirements:
executeStep<X>() should evaluate only if the previous one succee...
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...
Sending files using POST with HttpURLConnection
...erty("User-Agent", "CodeJava Agent");
httpConn.setRequestProperty("Test", "Bonjour");
outputStream = httpConn.getOutputStream();
writer = new PrintWriter(new OutputStreamWriter(outputStream, charset),
true);
}
/**
* Adds a form field to the reque...
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 ...
What is recursion and when should I use it?
...4 * 3 * 2 * 1. This function solves this in C# for positive integers (not tested - there may be a bug).
public int Factorial(int n)
{
if (n <= 1)
return 1;
return n * Factorial(n - 1);
}
share
...
Permutations in JavaScript?
...arison
Feel free to add your implementation to the following benchmark.js test suite:
function permute_SiGanteng(input) {
var permArr = [],
usedChars = [];
function permute(input) {
var i, ch;
for (i = 0; i < input.length; i++) {
ch = input.splice(i, 1)[0];
...
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
...
Solving “Who owns the Zebra” programmatically?
... @BenBurns: no reason. The answer was written in 2008. If you've tested it and it produces the same result then you could update the installation instructions and the corresponding links to the docs (it doesn't change the essential aspects of the answer -- you are free to edit it).
...
How to handle many-to-many relationships in a RESTful API?
...t match some natural key (e.g. Name). This is custom code that needs to be tested, costs more money and time etc etc
To avoid needing custom recovery code, we can implement PUT instead of POST.
From the RFC:
the intent of PUT is idempotent
For an operation to be idempotent, it needs to exclu...
What is the difference between a URI, a URL and a URN?
...URN?
The definition of URN is now looser than what I stated above. The latest RFC on URIs says that any URI can now be a URN (regardless of whether it starts with urn:) as long as it has "the properties of a name." That is: It is globally unique and persistent even when the resource ceases to exi...