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译文：理解Java中的弱引用 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...HashMap可以很便捷地转为HashMap或者Map。
引用队列(Reference Queue)
一旦弱引用对象开始返回null，该弱引用指向的对象就被标记成了垃圾。而这个弱引用对象（非其指向的对象）就没有什么用了。通常这时候需要进行一些清理工作。...
Add one row to pandas DataFrame
...-|-------------|-------------|-------------|
| Approach | 1000 rows | 5000 rows | 10 000 rows |
|------------|-------------|-------------|-------------|
| .append | 0.69 | 3.39 | 6.78 |
|------------|-------------|-------------|-------------|
| .loc w/o | 0.74 ...
Current location permission dialog disappears too quickly
...h is apparently bad. It might also have had something to do with choice of queue since I was waiting to start updating pending the result of a network request, but I didn't need to do any GCD magic to fix it...just needed to make sure I didn't repeat the start.
Hope someone's able to benefit from m...
Copy file(s) from one project to another using post build event…VS2010
...
Call Batch file which will run Xcopy for required files source to destination
call "$(SolutionDir)scripts\copyifnewer.bat"
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Two way sync with rsync
...cepts default (nonconflicting) options:
unison -auto dirA/ dirB/
unison -batch dirA/ dirB/ asks no questions at all, and writes to output how many files were ignored (because they conflicted).
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How Can I Browse/View The Values Stored in Redis [closed]
...S/SSL connection) or proxied access for local instances behind a firewall.
Batch operation over multiple key that match a pattern (delete, rename, duplicate)
Value editor
Online configuration
JavaScript API directly accessible from the browser console for light data processing
Lua Editor
O...
How to output git log with the first line only?
...
note to others, if you put this command in batch, replace % with %%, replace ' with "". result=git log --color --graph --pretty=format:"%%Cred%%h%%Creset -%%C(yellow)%%d%%Creset %%s %%Cgreen(%%cr) %%C(bold blue)<%%an>%%Creset" --abbrev-commit %1 . You can pass -...
How to fix the aspect ratio in ggplot?
...ferent axis limits into account:
df <- data.frame(
x = runif(100, 0, 5000),
y = runif(100, 0, 5))
ratio.display <- 4/3
ratio.values <- (max(df$x)-min(df$x))/(max(df$y)-min(df$y))
plot <- ggplot(df, aes(x=x, y=y)) + geom_point()
plot + coord_fixed(ratio.values / ratio.display)
Resu...
Start service in Android
...er handler;
private Runnable runnable;
private final int runTime = 5000;
@Override
public void onCreate() {
super.onCreate();
Log.i(TAG, "onCreate");
handler = new Handler();
runnable = new Runnable() {
@Override
public void r...
Hibernate throws org.hibernate.AnnotationException: No identifier specified for entity: com..domain.
...uences is MySQL.
The problem with IDENTITY is that automatic Hibernate batch inserts are disabled for this strategy. For more details about this topic, check out this article.
The SEQUENCE strategy is the best choice unless you are using MySQL. For the SEQUENCE strategy, you also want to use ...