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Multiple inheritance for an anonymous class
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Anonymous classes must extend or implement something, like any other Java class, even if it's just java.lang.Object.
For example:
Runnable r = new Runnable() {
public void run() { ... }
};
Here, r is an object of an anonymous class which implements Runnable.
An anonymous class can exte...
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...
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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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...
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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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 =...
What is “rvalue reference for *this”?
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There is an additional use case for the lvalue ref-qualifier form. C++98 has language that allows non-const member functions to be called for class instances that are rvalues. This leads to all kinds of weirdness that is against the very concept of rvalueness and deviates from how built-in type...
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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