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StringBuilder vs String concatenation in toString() in Java
... {
StringBuilder s = new StringBuilder();
for(int i=0;i<100000;i++)
s.append("*");
}
private static void slow()
{
String s = "";
for(int i=0;i<100000;i++)
s+="*";
}
}
The output is:
slow elapsed 11741 ms
fast ela...
How to change an application icon programmatically in Android?
...ant to give it a more stylish look
Bitmap bitmap = Bitmap.createBitmap(100, 100, Bitmap.Config.ARGB_8888);
Paint paint = new Paint();
paint.setColor(0xFF808080); // gray
paint.setTextAlign(Paint.Align.CENTER);
paint.setTextSize(50);
new Canvas(bitmap).drawText(""+number, 50, ...
Debugging in Clojure? [closed]
...
100
I have a little debugging macro that I find very useful:
;;debugging parts of expressions
(de...
How do I force Postgres to use a particular index?
...st perform a sequence / primary key scan instead. Conclusion - there is no 100% reliable method to force some index usage for PostgreSql server.
– Agnius Vasiliauskas
May 17 '18 at 6:42
...
How to identify numpy types in python?
... up with is:
isinstance(y, (np.ndarray, np.generic) )
However, it's not 100% clear that all numpy types are guaranteed to be either np.ndarray or np.generic, and this probably isn't version robust.
share
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Using reCAPTCHA on localhost
...here's an important caveat that stumped me: When migrating from reCAPTCHA v1 to v2, it is necessary to regenerate the API keys in order for this message to disappear. Further, and equally important, if you're like me and you setup test domains in your local/development environment by placing entri...
How to migrate/convert from SVN to Mercurial (hg) on windows
...
This worked well for me with Mercurial V1.4.3. A 1-year-old svn repository converted very quickly with the full history intact. Many thanks!
– Jonathan Webb
Feb 25 '10 at 20:08
...
Update multiple columns in SQL
...The "tiresome way" is standard SQL and how mainstream RDBMS do it.
With a 100+ columns, you mostly likely have a design problem... also, there are mitigating methods in client tools (eg generation UPDATE statements) or by using ORMs
...
HTTP GET with request body
...al/wrong to have a GET endpoint that gets all entities? E.g. GET /contacts/100/addresses returns a collection of addresses for the person with id=100.
– Josh M.
Jul 7 '16 at 19:21
...
Full-screen iframe with a height of 100%
Is iframe height=100% supported in all browsers?
17 Answers
17
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