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Is it good practice to use java.lang.String.intern()?
...t uses 4-5x less memory than rolling your own object pool
Be sure to tune -XX:StringTableSize (the default is probably too small; set a Prime number)
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外媒评本轮科技泡沫：创业公司首当其冲 九成将消失 - 资讯 - 清泛网 - 专注...
...届时估计会有90%的创业公司不复存在。
北京时间6月29日消息，《华尔街日报》科技专栏作家克里斯托弗·米姆斯（Christopher Mims）今日撰文指出，科技行业目前正处于泡沫之中。由于创业公司可以更为轻松地从风投公司那里获得...
Allowed characters in Linux environment variable names
...you are using docker, you can set variable in Dockerfile
FROM busybox
ENV xx.f%^&*()$#ff=1234
Kubernetes configmap
If you are using kubernetes, you can set variable by ConfigMap
test.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: foo-config
data:
"xx.ff-bar": "1234"
---
apiVers...
How to concatenate twice with the C preprocessor and expand a macro as in “arg ## _ ## MACRO”?
...
Standard C Preprocessor
$ cat xx.c
#define VARIABLE 3
#define PASTER(x,y) x ## _ ## y
#define EVALUATOR(x,y) PASTER(x,y)
#define NAME(fun) EVALUATOR(fun, VARIABLE)
extern void NAME(mine)(char *x);
$ gcc -E xx.c
# 1 "xx.c"
# 1 "<built-in>"
# 1 "<...
What's the correct way to sort Python `import x` and `from x import y` statements?
...m g import yy # changed gg->yy for illustrative purposes
import x
from xx import xx
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How do I write a correct micro-benchmark in Java?
...ral tens of thousands of inner loop iterations.)
Rule 2: Always run with -XX:+PrintCompilation, -verbose:gc, etc., so you can verify that the compiler and other parts of the JVM are not doing unexpected work during your timing phase.
Rule 2.1: Print messages at the beginning and end of timing and ...
Logging best practices [closed]
...owing specific codes.
e.g. The first digit can detail the general class: 1xxx can be used for 'Start' operations, 2xxx for normal behaviour, 3xxx for activity tracing, 4xxx for warnings, 5xxx for errors, 8xxx for 'Stop' operations, 9xxx for fatal errors, etc.
The second digit can detail the area, ...
How do I set the figure title and axes labels font size in Matplotlib?
...
‘xx-small’, ‘x-small’, ‘small’, ‘medium’, ‘large’, ‘x-large’, ‘xx-large’. See matplotlib.org/api/…
– tsando
Oct 11 '17 at 8:37
...
vertical divider between two columns in bootstrap
...s also have some problems...
When you try to be clever/lazy and use col-XX-X class together with hidden-XX/visible-XX classes inside the same row element.
When you have a lot of columns and need a pixel perfect thing. Since it moves n-1 column 1px to the left.
... But on the other hand it's res...
Hidden features of Scala
...
As a illustration of the use consider the following source:
class A { "xx".r }
Compiling this with scalac -Xprint:typer outputs:
package <empty> {
class A extends java.lang.Object with ScalaObject {
def this(): A = {
A.super.this();
()
};
scala.this.Predef.augm...