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What is
...extends Comparable<? super T>>, it's when you have something like Cat extends Animal implements Comparable<Animal>.
Look at the signature of Collections.sort
public static <T extends Comparable<? super T>> void sort(List<T> list)
Therefore, with a List<Cat> li...
Standardize data columns in R
...
apply(scaled.dat, 2, sd)
Using built in functions is classy. Like this cat:
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jQuery set checkbox checked
... to the conversation.
Here is the longhand code for a fullcalendar modification that says if the retrieved value "allDay" is true, then check the checkbox with ID "even_allday_yn":
if (allDay)
{
$( "#even_allday_yn").prop('checked', true);
}
else
{
$( "#even_allday_yn").prop('checked', fa...
My docker container has no internet
...
First thing to check is run cat /etc/resolv.conf in the docker container. If it has an invalid DNS server, such as nameserver 127.0.x.x, then the container will not be able to resolve the domain names into ip addresses, so ping google.com will fail.
Se...
Parsing JSON Object in Java [duplicate]
...bject obj = new JSONObject("{interests : [{interestKey:Dogs}, {interestKey:Cats}]}");
List<String> list = new ArrayList<String>();
JSONArray array = obj.getJSONArray("interests");
for(int i = 0 ; i < array.length() ; i++){
list.add(array.getJSONObject(i).getString("interestKey"))...
Send string to stdin
...
You can use one-line heredoc
cat <<< "This is coming from the stdin"
the above is the same as
cat <<EOF
This is coming from the stdin
EOF
or you can redirect output from a command, like
diff <(ls /bin) <(ls /usr/bin)
or you c...
How can I delete a newline if it is the last character in a file?
...ble (POSIX-compliant) alternative (slightly less efficient):
printf %s "$(cat in.txt)" > out.txt
Note:
If in.txt ends with multiple newline characters, the command substitution removes all of them - thanks, @Sparhawk. (It doesn't remove whitespace characters other than trailing newlines.)
Si...
Parsing command-line arguments in C?
...op. It should handle - as standard input. Note that using this would indicate that op_mode should be a static file scope variable. The filter() function takes argc, argv, optind and a pointer to the processing function. It should return 0 (EXIT_SUCCESS) if it was able to open all the files and a...
Why can't I overload constructors in PHP?
...','.$a2.','.$a3.PHP_EOL);
}
}
$o = new A('sheep');
$o = new A('sheep','cat');
$o = new A('sheep','cat','dog');
// results:
// __construct with 1 param called: sheep
// __construct with 2 params called: sheep,cat
// __construct with 3 params called: sheep,cat,dog
?>
and, it seem every one a...
Where are sudo incidents reported? [closed]
...place root with your username, in my case ryan, so the log is found with:
cat /var/spool/mail/ryan
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