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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++) {
...
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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Java: possible to line break in a properties file?
Is it possible to continue a long string on the next line in a Java properties file?
3 Answers
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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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Pretty-print a Map in Java
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Using Java 8 Streams:
Map<Object, Object> map = new HashMap<>();
String content = map.entrySet()
.stream()
.map(e -> e.getKey() + "=\"" + e.getValue() + "\"")
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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...
Java regex capturing groups indexes
...r capturing groups in different branches of alternation.
Group name
From Java 7, you can define a named capturing group (?<name>pattern), and you can access the content matched with Matcher.group(String name). The regex is longer, but the code is more meaningful, since it indicates what you ...
Why does the JVM still not support tail-call optimization?
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Diagnosing Java Code: Improving the Performance of Your Java Code (alt) explains why the JVM does not support tail-call optimization.
But although it is well known how to automatically transform a tail-recursive function into a sim...
How to format strings in Java
...
In addition to String.format, also take a look java.text.MessageFormat. The format less terse and a bit closer to the C# example you've provided and you can use it for parsing as well.
For example:
int someNumber = 42;
String someString = "foobar";
Object[] args = ...
How do I convert a Java 8 IntStream to a List?
... methods. This is done by adding the Collectors class in Preferences -> Java -> Editor -> Content Assist -> Favorites. After this, you only have to type toLi at hit Ctr+Space to have the IDE fill in toList and add the static import.
– Lii
Jun 29 '16...