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What is the right way to POST multipart/form-data using curl?
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I had a hard time sending a multipart HTTP PUT request with curl to a Java backend. I simply tried
curl -X PUT URL \
--header 'Content-Type: multipart/form-data; boundary=---------BOUNDARY' \
--data-binary @file
and the content of the file was
-----------BOUNDARY
Content-Disposition: for...
What does the `forall` keyword in Haskell/GHC do?
...in onJust mval
This code doesn't compile (syntax error) in plain Haskell 98. It requires an extension to support the forall keyword.
Basically, there are 3 different common uses for the forall keyword (or at least so it seems), and each has its own Haskell extension: ScopedTypeVariables, RankNTyp...
Why use a ReentrantLock if one can use synchronized(this)?
...aspect that's gonna become more relevant in the near future has to do with Java 15 and Project Loom. In the (new) world of virtual threads, the underlying scheduler would be able to work much better with ReentrantLock than it's able to do with synchronized, that's true at least in the initial Java 1...
Class Not Found Exception when running JUnit test
...to Properties -> Builders and then move Maven Project Builder above the Java Builder and it worked for me.
– xorcus
Mar 29 '16 at 21:43
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Should try…catch go inside or outside a loop?
...f the error is compared against the table.
Here's a reference: http://www.javaworld.com/javaworld/jw-01-1997/jw-01-hood.html
The table is described about half-way down.
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What does Serializable mean?
What exactly does it mean for a class to be Serializable in Java? Or in general, for that matter...
10 Answers
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Convert JsonNode into POJO
...he official documentation for that call: http://jackson.codehaus.org/1.7.9/javadoc/org/codehaus/jackson/map/ObjectMapper.html#readValue(java.lang.String, java.lang.Class)
You can also define a custom deserializer when you instantiate the ObjectMapper:
http://wiki.fasterxml.com/JacksonHowToCustomDes...
How do I center text horizontally and vertically in a TextView?
...er_horizontal according to your need.
and as @stealthcopter commented
in java: .setGravity(Gravity.CENTER);
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How to check if a line is blank using regex
...es) by trim()-ing it, then checking if the resulting string isEmpty().
In Java, this would be something like this:
if (line.trim().isEmpty()) {
// line is "blank"
}
The regex solution can also be simplified without anchors (because of how matches is defined in Java) as follows:
if (line.mat...
How to remove newlines from beginning and end of a string?
...g::trim method has a strange definition of whitespace.
As discussed here, Java 11 adds new strip… methods to the String class. These use a more Unicode-savvy definition of whitespace. See the rules of this definition in the class JavaDoc for Character::isWhitespace.
Example code.
String input =...