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Finding out whether a string is numeric or not
How can we check if a string is made up of numbers only. I am taking out a substring from a string and want to check if it is a numeric substring or not.
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Difference between onCreateView and onViewCreated in Fragment
... other views using findViewById in onCreateView.
Because sometimes view is not properly initialized. So always use findViewById in onViewCreated(when view is fully created) and it also passes the view as parameter.
onViewCreated is a make sure that view is fully created.
onViewCreated androi...
File changed listener in Java
...thing but a thread that polls the lastModified File property and clearly this solution is not optimal.
14 Answers
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How to save an HTML5 Canvas as an image on a server?
...low users to save the resulting images from an algorithm. The general idea is:
8 Answers
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How to use NULL or empty string in SQL
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Select *
From Table
Where (col is null or col = '')
Or
Select *
From Table
Where IsNull(col, '') = ''
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Access lapply index names inside FUN
Is there a way to get the list index name in my lapply() function?
12 Answers
12
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What is a bus error?
...ypically:
using a processor instruction with an address that does not satisfy its alignment requirements.
Segmentation faults occur when accessing memory which does not belong to your process, they are very common and are typically the result of:
using a pointer to something that was deallocat...
How to check if click event is already bound - JQuery
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Update 24 Aug '12: In jQuery 1.8, it is no longer possible to access the element's events using .data('events'). (See this bug for details.) It is possible to access the same data with jQuery._data(elem, 'events'), an internal data structure, which is undocumen...
Why is a pure virtual function initialized by 0?
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The reason =0 is used is that Bjarne Stroustrup didn't think he could get another keyword, such as "pure" past the C++ community at the time the feature was being implemented. This is described in his book, The Design & Evolution of C+...
Selenium wait until document is ready
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Try this code:
driver.manage().timeouts().pageLoadTimeout(10, TimeUnit.SECONDS);
The above code will wait up to 10 seconds for page loading. If the page loading exceeds the time it will throw the TimeoutException. You catch t...