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Why doesn't String switch statement support a null case?
...ception
The output of the javap command below reveals that case is chosen based on the hashcode of the switch argument string and hence throws NPE when .hashCode() is invoked on null string.
6: invokevirtual #18 // Method java/lang/String.hashCode:()I
9: lookupswitch { // 3
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Lock-free multi-threading is for real threading experts
...ents about MPI: I sincerely agree that MPI may shine in some areas. An MPI based solution can be easier to reason about, easier to implement and less error-prone than a half-baked locking implementation that tries to be smart. (It is however - subjectively - also true for an STM based solution.) I w...
How do I generate random integers within a specific range in Java?
...at means that instead of a proper RNG you're going to get "random" numbers based on whatever seed is chosen each time - often this is based on the system clock. This can give decidedly non-random results. Instead, you should consider instantiating your Random instance outside of method scope. The...
Setting transparent images background in IrfanView
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Based on my tests, this actually seems to be the easiest and most effective solution to saved icons missing transparency. Just make sure you click "options" like @Annalisa says, and not "Advanced"
– Eric...
How to set default font family for entire Android app
...ght for TextView and Button classes:
<style name="AppTheme" parent="AppBaseTheme">
<item name="android:textViewStyle">@style/RobotoTextViewStyle</item>
<item name="android:buttonStyle">@style/RobotoButtonStyle</item>
</style>
<style name="RobotoTextVi...
How do you make sure email you send programmatically is not automatically marked as spam?
...s is a tricky one and I've always relied on techniques, such as permission-based emails (i.e. only sending to people you have permission to send to) and not using blatantly spamish terminology.
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Finding the index of an item in a list
...k at the documentation for it:
list.index(x[, start[, end]])
Return zero-based index in the list of the first item whose value is equal to x. Raises a ValueError if there is no such item.
The optional arguments start and end are interpreted as in the slice notation and are used to limit the search...
How to style a JSON block in Github Wiki?
...llowing screenshots are from the Gitlab in a markdown file.
This may vary based on the colors using for syntax in MARKDOWN files.
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It is more efficient to use if-return-return or if-else-return?
...t important thing in this decision IMO is to be consistent within the code base.
– skeller88
Jun 18 '17 at 20:46
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Java “user.dir” property - what exactly does it mean?
I want to use user.dir dir as a base dir for my unit tests (that creates a lot of files). Is it correct that this property points to the current working directory (e.g. set by the 'cd' command)?
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