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Java: Clear the console
...ard output gets redirected to a pipe which the initiating Java process can read. But when the output of the cls command gets redirected, it doesn’t clear the console.
To solve this problem, we have to invoke the command line interpreter (cmd) and tell it to execute a command (/c cls) which allow...
What does a lazy val do?
... when it is not sure if it is later used.
scala> class X { val x = { Thread.sleep(2000); 15 } }
defined class X
scala> class Y { lazy val y = { Thread.sleep(2000); 13 } }
defined class Y
scala> new X
res5: X = X@262505b7 // we have to wait two seconds to the result
scala> new Y
res6:...
TINYTEXT, TEXT, MEDIUMTEXT, and LONGTEXT maximum storage sizes
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@vlasits read the included SO post for details. (1) all text types, including tinytext are stored as objects outside the row which is one overhead (2) These objects are then referenced by addresses 8 or 16 bytes. so no matter how tiny...
Converting newline formatting from Mac to Windows
... utility/script that will convert a .sql dump file generated on Mac to one readable on Windows. This is a continuation of a problem I had here . The issue seems to be with newline formatting in text files, but I can't find a tool to make the conversion...
...
How do you debug MySQL stored procedures?
...essage Text' AS `Title`;
I got this idea from
http://forums.mysql.com/read.php?99,78155,78225#msg-78225
Also somebody created a template for custom debug procedures on GitHub.
See here
http://www.bluegecko.net/mysql/debugging-stored-procedures/
https://github.com/CaptTofu/Stored-procedure-de...
Percentage width in a RelativeLayout
...Note that the weight sum doesn't have to equal 1, I just find it easier to read like this. You can set the first weight to 7 and the second to 3 and it will give the same result.
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How to Generate unique file names in C#
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If readability doesn't matter, use GUIDs.
E.g.:
var myUniqueFileName = string.Format(@"{0}.txt", Guid.NewGuid());
or shorter:
var myUniqueFileName = $@"{Guid.NewGuid()}.txt";
In my programs, I sometimes try e.g. 10 times ...
Why do we need Abstract factory design pattern?
...e and an XML file). You have two different data access interfaces e.g. an IReadableStoreand IWritableStore defining the common methods expected by your application regardless of the type of data source used.
Which type of data source shall be used shouldn't change the way client code retrieves it's...
Difference between getAttribute() and getParameter()
...hin the same request. For example - you set an attribute in a servlet, and read it from a JSP. Can be used for any object, not just string.
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Command to get nth line of STDOUT
... -n 2p
Using this alternative, which looks more efficient since it stops reading the input when the required line is printed, may generate a SIGPIPE in the feeding process, which may in turn generate an unwanted error message:
ls -l | sed -n -e '2{p;q}'
I've seen that often enough that I usuall...