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Java Map equivalent in C#
...trying to hold a list of items in a collection with a key of my choice. In Java, I would simply use Map as follows:
3 Answe...
Why is there no GIL in the Java Virtual Machine? Why does Python need one so bad?
...ne can provide some insight as to what's fundamentally different about the Java Virtual Machine that allows it to implement threads nicely without the need for a Global Interpreter Lock (GIL), while Python necessitates such an evil.
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Why does writeObject throw java.io.NotSerializableException and how do I fix it?
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java.io.NotSerializableException can occur when you serialize an inner class instance because:
serializing such an inner class instance will result in serialization
of its associated outer class instance as well
Serializatio...
How to get a thread and heap dump of a Java process on Windows that's not running in a console
I have a Java application that I run from a console which in turn executes an another Java process. I want to get a thread/heap dump of that child process.
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How to get thread id from a thread pool?
...rily start from 0 or 1.
Here is an example matching the question:
import java.util.concurrent.*;
class ThreadIdTest {
public static void main(String[] args) {
final int numThreads = 5;
ExecutorService exec = Executors.newFixedThreadPool(numThreads);
for (int i=0; i<10; i++) {
...
Mockito: List Matchers with generics
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For Java 8 and above, it's easy:
when(mock.process(Matchers.anyList()));
For Java 7 and below, the compiler needs a bit of help. Use anyListOf(Class<T> clazz):
when(mock.process(Matchers.anyListOf(Bar.class)));
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Is it expensive to use try-catch blocks even if an exception is never thrown?
...to catch exceptions. But, is it also expensive to use a try-catch block in Java even if an exception is never thrown?
7 An...
Why does the MongoDB Java driver use a random number generator in a conditional?
I saw the following code in this commit for MongoDB's Java Connection driver , and it appears at first to be a joke of some sort. What does the following code do?
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Regular expression for floating point numbers
.... and [0-9] instead of \d to avoid escaping issues in some languages (like Java).
Thanks to the nameless one for originally recognizing this.
One relatively simple pattern for matching a floating point number is
[+-]?([0-9]*[.])?[0-9]+
This will match:
123
123.456
.456
See a working exampl...
Java - Including variables within strings?
...r you, but it can be quite handy. The syntax is the same as for printf and java.util.Formatter. I've used it much especially if I want to show tabular numeric data.
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