大约有 47,000 项符合查询结果（耗时：0.0789秒） [XML]
How to send HTTP request in java? [duplicate]
...n't forget to add the JAR HttpClient.jar to the classpath.
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.ht...
What are the applications of binary trees?
...lized image-signatures in which a hash needs to be verified, but the whole file is not available.
Heaps - Used in implementing efficient priority-queues, which in turn are used for scheduling processes in many operating systems, Quality-of-Service in routers, and A* (path-finding algorithm used in A...
What is the $? (dollar question mark) variable in shell scripting? [duplicate]
...alue of the last executed command.
Try the following in the shell:
ls somefile
echo $?
If somefile exists (regardless whether it is a file or directory), you will get the return value thrown by the ls command, which should be 0 (default "success" return value). If it doesn't exist, you should get...
How to create a directory and give permission in single command
...t you want. Be aware that every user has the right to write add and delete files in that directory.
share
|
improve this answer
|
follow
|
...
JUnit tests pass in Eclipse but fail in Maven Surefire
... Good to hear. In my case the problem was very likely that a configuration file read by the JUnit test stayed in the memory, corrupting the result of a subsequent test. When forkMode is set to true, each test class is executed completely indenpendently of the other guaranteeing that the tests are ex...
Purge Kafka Topic
...
Remember to add line delete.topic.enable=true in file config/server.properties, as the warning printed by the mentioned command says Note: This will have no impact if delete.topic.enable is not set to true.
– Patrizio Bertoni
Aug 19 '1...
What's the difference between lists enclosed by square brackets and parentheses in Python?
...gt; x
(1, 2)
>>> x.append(3)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'tuple' object has no attribute 'append'
The other main difference is that a tuple is hashable, meaning that you can use it as a key to a dictionary, among oth...
How do I prompt for Yes/No/Cancel input in a Linux shell script?
...KeyChooser
5. Using readline's history
Example:
#!/bin/bash
set -i
HISTFILE=~/.myscript.history
history -c
history -r
myread() {
read -e -p '> ' $1
history -s ${!1}
}
trap 'history -a;exit' 0 1 2 3 6
while myread line;do
case ${line%% *} in
exit ) break ;;
* ...
Case objects vs Enumerations in Scala
...erations (for example, to a database) or create them from data residing in files. However, I find in general that enumerations are a bit clumsy in Scala and have the feel of an awkward add-on, so I now tend to use case objects. A case object is more flexible than an enum:
sealed trait Currency { def...
Can't use modulus on doubles?
...
Use fmod() from <cmath>. If you do not want to include the C header file:
template<typename T, typename U>
constexpr double dmod (T x, U mod)
{
return !mod ? x : x - mod * static_cast<long long>(x / mod);
}
//Usage:
double z = dmod<double, unsigned int>(14.3, 4);
doubl...