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When do I need to use AtomicBoolean in Java?
...ultiple threads need to check and change the boolean. For example:
if (!initialized) {
initialize();
initialized = true;
}
This is not thread-safe. You can fix it by using AtomicBoolean:
if (atomicInitialized.compareAndSet(false, true)) {
initialize();
}
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How do I check OS with a preprocessor directive?
...need my code to do different things based on the operating system on which it gets compiled. I'm looking for something like this:
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Android Calling JavaScript functions in WebView
I am trying to call some javascript functions sitting in an html page running inside an android webview . Pretty simple what the code tries to do below - from the android app, call a javascript function with a test message, which inturn calls a java function back in the android app that disp...
Extract numbers from a string
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$str = 'In My Cart : 11 12 items';
preg_match_all('!\d+!', $str, $matches);
print_r($matches);
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Why does X[Y] join of data.tables not allow a full outer join, or a left join?
This is a bit of a philosophical question about data.table join syntax. I am finding more and more uses for data.tables, but still learning...
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Catch multiple exceptions in one line (except block)
...gMeanException), e:
pass
Separating the exception from the variable with a comma will still work in Python 2.6 and 2.7, but is now deprecated and does not work in Python 3; now you should be using as.
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AngularJS HTTP post to PHP and undefined
I have a form with the tag ng-submit="login()
9 Answers
9
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How do I add multiple arguments to my custom template filter in a django template?
...go's docs and book but only found example using a single argument... is it even possible?
9 Answers
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How to access parent Iframe from JavaScript
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Maybe it is not obvious for everyone, but with this method you can access a library object of the parent (only if the parent has already loaded the library). Example: access jQuery with parent.$('#something')
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How can I programmatically check whether a keyboard is present in iOS app?
I need to check the condition of keyboard visibility in my iOS app.
20 Answers
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