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How can I get System variable value in Java?
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edited Aug 29 '17 at 22:50
Steve Kuo
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Syntax for a single-line Bash infinite while loop
I am having trouble coming up with the right combination of semicolons and/or braces. I'd like to do this, but as a one-liner from the command line:
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Float right and position absolute doesn't work together
I want a div to be always at the right of its parent div, so I use float:right . It works.
5 Answers
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Make an existing Git branch track a remote branch?
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Given a branch foo and a remote upstream:
As of Git 1.8.0:
git branch -u upstream/foo
Or, if local branch foo is not the current branch:
git branch -u upstream/foo foo
Or, if you like to type longer commands, these are equivalent to the above two:
git branch --set-upstrea...
How to detect unused methods and #import in Objective-C
After working a long time on an iPhone app, I realized that my code is quite dirty, containing several #import and methods that are not called or useful at all.
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Is it valid to have a tag inside another tag?
Are <section> tags allowed to be included within another <section> tag? Will it validate in HTML5?
3 Answer...
Why does parseInt yield NaN with Array#map?
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From the same Mozilla page that you linked to:
callback is invoked with three arguments: the value of the element, the index of the element, and the Array object being traversed."
So if you call a function parseInt which actually expects two arguments, the second argument will be the index ...
Comparing arrays in JUnit assertions, concise built-in way?
...ncise, built-in way to do equals assertions on two like-typed arrays in JUnit? By default (at least in JUnit 4) it seems to do an instance compare on the array object itself.
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Display the current time and date in an Android application
....format(new Date());
// textView is the TextView view that should display it
textView.setText(currentDateTimeString);
There is more to read in the documentation that can easily be found here
. There you'll find more information on how to change the format used for conversion.
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MongoDB drop every database
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you can create a javascript loop that do the job and then execute it in the mongoconsole.
var dbs = db.getMongo().getDBNames()
for(var i in dbs){
db = db.getMongo().getDB( dbs[i] );
print( "dropping db " + db.getName() );
db.dropDatabase();
}
save it to dropall.js and then ex...