大约有 30,000 项符合查询结果（耗时：0.0561秒） [XML]
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.
share
|
improve this answer
...
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?
...
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: 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
...
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 ...
Pretty-print a Map in Java
...
Using Java 8 Streams:
Map<Object, Object> map = new HashMap<>();
String content = map.entrySet()
.stream()
.map(e -> e.getKey() + "=\"" + e.getValue() + "\"")
...
Why does the JVM still not support tail-call optimization?
...
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...