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Why use @PostConstruct?
...s are injected. In the @PostConstruct method the bean is fully initialized and you can use the dependencies.
because this is the contract that guarantees that this method will be invoked only once in the bean lifecycle. It may happen (though unlikely) that a bean is instantiated multiple times by th...
In JavaScript, why is “0” equal to false, but when tested by 'if' it is not false by itself?
...you explicitly do "0" == false, both sides are being converted to numbers, and then the comparison is performed.
When you do: if ("0") console.log("ha"), the string value is being tested. Any non-empty string is true, while an empty string is false.
Equal (==)
If the two operands are not o...
Why can't non-default arguments follow default arguments?
...ters must be placed before any default arguments. Simply because they are mandatory, whereas default arguments are not. Syntactically, it would be impossible for the interpreter to decide which values match which arguments if mixed modes were allowed. A SyntaxError is raised if the arguments are not...
Difference between Key, Primary Key, Unique Key and Index in MySQL
When should I use KEY , PRIMARY KEY , UNIQUE KEY and INDEX ?
8 Answers
8
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When is a Java method name too long? [closed]
..., as you not only want to convey the behaviour but also keep the project's and language's convention. So in Python you might say eligible_items_cnt but in Java you usually say getEligibleItemsCount.
– flybywire
Feb 9 '10 at 17:14
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How to make execution pause, sleep, wait for X seconds in R?
...anguages, there is a sleep function, but ?sleep references a data set. And ?pause and ?wait don't exist.
2 Answers
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Saving and Reading Bitmaps/Images from Internal memory in Android
... when I want to share the saved image, it returns "Directory not created" and the image is crashed. can you help me?
– A. N
Oct 9 '17 at 8:02
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Why doesn't Java allow to throw a checked exception from static initialization block?
...
Because it is not possible to handle these checked exceptions in your source. You do not have any control over the initialization process and static{} blocks cannot be called from your source so that you could surround them with try-catch.
Because you can...
HttpURLConnection timeout settings
...as a setConnectTimeout method.
Just set the timeout to 5000 milliseconds, and then catch java.net.SocketTimeoutException
Your code should look something like this:
try {
HttpURLConnection.setFollowRedirects(false);
HttpURLConnection con = (HttpURLConnection) new URL(url).openConnection();...
How do I run only specific tests in Rspec?
...on is here (for Rspec 2.12) relishapp.com/rspec/rspec-core/v/2-12/docs/command-line/…
– tir38
Apr 10 '13 at 19:31
We...