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Java generics - why is “extends T” allowed but not “implements T”?
I wonder if there is a special reason in Java for using always " extends " rather than " implements " for defining bounds of typeparameters.
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How to create a CPU spike with a bash command
I want to create a near 100% load on a Linux machine. It's quad core system and I want all cores going full speed. Ideally, the CPU load would last a designated amount of time and then stop. I'm hoping there's some trick in bash. I'm thinking some sort of infinite loop.
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How to set Oracle's Java as the default Java in Ubuntu?
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I put the line:
export JAVA_HOME=/usr/lib/jvm/java-7-oracle
in my ~/.bashrc file.
/usr/lib/jvm/java7-oracle should be a symbolic link pointing to /usr/lib/jvm/java-7-oracle-[version number here].
The reason it's a symbolic link is that in...
Android TextView Justify Text
How do you get the text of a TextView to be Justified (with text flush on the left- and right- hand sides)?
27 Answers
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MySQL - SELECT WHERE field IN (subquery) - Extremely slow why?
...se IN with a subquery; this is notoriously slow.
Only ever use IN with a fixed list of values.
More tips
If you want to make queries faster,
don't do a SELECT * only select
the fields that you really need.
Make sure you have an index on relevant_field to speed up the equi-join.
Make sure to gr...
Python logging: use milliseconds in time format
...ord.msecs)
return s
Notice the comma in "%s,%03d". This can not be fixed by specifying a datefmt because ct is a time.struct_time and these objects do not record milliseconds.
If we change the definition of ct to make it a datetime object instead of a struct_time, then (at least with modern ...
How to set specific java version to Maven
... your mvn(non-windows)/mvn.bat/mvn.cmd(windows) and set your java version explicitly there.
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What is the meaning of the term “free function” in C++?
.... Every function that is not a member function is a free function.
struct X {
void f() {} // not a free function
};
void g() {} // free function
int h(int, int) { return 1; } // also a free function
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An algorithm for inflating/deflating (offsetting, buffering) polygons
...d think this question is "forgotten"! I looked here last week -- I wasn't expecting to come back to this! Thanks a bunch!
– Chris Burt-Brown
Nov 3 '11 at 11:24
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How to check if element is visible after scrolling?
I'm loading elements via AJAX. Some of them are only visible if you scroll down the page. Is there any way I can know if an element is now in the visible part of the page?
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