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How can I pad a String in Java?
...*chars
Display '*' for characters of password:
String password = "secret123";
String padded = String.format("%"+password.length()+"s", "").replace(' ', '*');
output has the same length as the password string:
secret123
*********
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Sharing a URL with a query string on Twitter
... can be solved by using https://twitter.com/intent/tweet instead of http://www.twitter.com/share. Using the intent/tweet function, you simply URL encode your entire URL and it works like a charm.
https://dev.twitter.com/web/intents
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How to get the data-id attribute?
...
To get the contents of the attribute data-id (like in <a data-id="123">link</a>) you have to use
$(this).attr("data-id") // will return the string "123"
or .data() (if you use newer jQuery >= 1.4.3)
$(this).data("id") // will return the number 123
and the part after data- ...
ALTER DATABASE failed because a lock could not be placed on database
...here is a link that shows that the problem has occurred elsewhere.
http://www.geakeit.co.uk/2010/12/11/sql-take-offline-fails-alter-database-failed-because-a-lock-could-not-error-5061/
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impr...
Host 'xxx.xx.xxx.xxx' is not allowed to connect to this MySQL server
...ccess the MySQL Database on your actual server (say your remote address is 123.123.123.123 at port 3306 as user 'root' and I want to change permissions on database 'dataentry'. Remember to change the IP Address, Port, and database name to your settings)
mysql -u root -p
Enter password: <enter p...
How do I format a string using a dictionary in python-3.x?
...yntax, available since Python 3.6:
>>> geopoint = {'latitude':41.123,'longitude':71.091}
>>> print(f'{geopoint["latitude"]} {geopoint["longitude"]}')
41.123 71.091
Note the outer single quotes and inner double quotes (you could also do it the other way around).
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How to get the client IP address in PHP [duplicate]
...answered Oct 8 '14 at 16:20
josh123a123josh123a123
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How to query nested objects?
...th=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 47.1084 7.58816C47.4091 7.46349 47.7169 7.36433 48.0099 7.26993C48.9099 6.97997 49.672 6.73443 49.672 5.93063C49.672 5.22043 48.9832 4...
What does ~~ (“double tilde”) do in Javascript?
...nverts a string to a number in a round-about way.
See this thread: http://www.sitepoint.com/forums/showthread.php?t=663275
Also, more detailed info is available here: http://dreaminginjavascript.wordpress.com/2008/07/04/28/
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MQTT与TCP的区别 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...选择其中一种。应用案例TCP用于许多互联网应用程序，如WWW、email、FTP、SSH、P2P、流媒体。MQTT也是基于TCP的。MQTT可以用于物联网数据传输、IM聊天软件等。
二、mqtt协议的特点mqtt提供了qos0、qos1和qos2的不同的消息发送的服务质...