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How to free memory in Java?
...is slightly too small, you're going to pay for it.) For example, in G1:
XX:G1NewSizePercent (defaults to 5; probably doesn't matter.)
XX:G1MaxNewSizePercent (defaults to 60; probably raise this.)
Consider telling the garbage collector you're not okay with a longer pause. This will cause more-fr...
Regular expression for a hexadecimal number?
...
How about the following?
0[xX][0-9a-fA-F]+
Matches expression starting with a 0, following by either a lower or uppercase x, followed by one or more characters in the ranges 0-9, or a-f, or A-F
...
How is the default max Java heap size determined?
...nd out the defaults on the system where your applications runs.
java -XX:+PrintFlagsFinal -version | findstr HeapSize
Look for the options MaxHeapSize (for -Xmx) and InitialHeapSize for -Xms.
On a Unix/Linux system, you can do
java -XX:+PrintFlagsFinal -version | grep HeapSize
I believ...
Getting Http Status code number (200, 301, 404, etc.) from HttpWebRequest and HttpWebResponse
...
You have to be careful, server responses in the range of 4xx and 5xx throw a WebException. You need to catch it, and then get status code from a WebException object:
try
{
wResp = (HttpWebResponse)wReq.GetResponse();
wRespStatusCode = wResp.StatusCode;
}
catch (WebException...
How do I get an apk file from an Android device?
...b shell pm list packages -f -3
the output will be
package:/data/app/XX.XX.XX.apk=YY.YY.YY
now pull that package using below code:
adb pull /data/app/XX.XX.XX.apk
if you executed above cmd in C:>\ , then you will find that package there.
...
How to convert Milliseconds to “X mins, x seconds” in Java?
... want to show them the time elapsed using a human readable format such as "XX hours, XX mins, XX seconds" or even "XX mins, XX seconds" because its not likely to take someone an hour.
...
Do any JVM's JIT compilers generate code that uses vectorized floating point instructions?
... small snippet of vectorizable math.
Run their benchmark flipping between -XX:-UseSuperWord and -XX:+UseSuperWord(default)
If no difference in performance is observed, your code probably didn't get vectorized
To make sure, run your benchmark such that it prints out the assembly. On linux you can enj...
HTTP status code for update and delete?
...st, but is not returning any content
Source: List of HTTP status codes: 2xx Success
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Extracting the last n characters from a string in R
... on Andrie's code)
substrRight <- function(x, n){
sapply(x, function(xx)
substr(xx, (nchar(xx)-n+1), nchar(xx))
)
}
> substrRight(c("12345","ABCDE"),2)
12345 ABCDE
"45" "DE"
Note that I have changed (nchar(x)-n) to (nchar(x)-n+1) to get n characters.
...
2015互联网结束补贴战 从相杀到相爱只需一个长假 - 资讯 - 清泛网 - 专注C/...
...庆长假最后一天，“传言大众点评和美团要合并！”这则消息在朋友圈迅速传播。
“在新中国成立66周年的国庆长假期间，美团和点评完成了中国互联网历史性的战略合作，双方共同成立一家新公司。”国庆节结束后的第一个...