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Is it safe to get values from a java.util.HashMap from multiple threads (no modification)?
...a map will be constructed, and once it is initialized, it will never be modified again. It will however, be accessed (via get(key) only) from multiple threads. Is it safe to use a java.util.HashMap in this way?
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How to test if a double is an integer
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if ((variable == Math.floor(variable)) && !Double.isInfinite(variable)) {
// integer type
}
This checks if the rounded-down value of the double is the same as the double.
Your variable could have an int or doub...
Is it a good practice to use an empty URL for a HTML form's action attribute? (action=“”)
I am wondering if anyone can give a "best practices" response to using blank HTML form actions to post back to the current page.
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Android destroying activities, killing processes
... not be resumed until this method
returns. Followed by either onResume() if the activity returns back to
the front, or onStop() if it becomes invisible to the user.
onStop() Called when the activity is no longer visible to the user, because another activity has been resumed and is covering ...
SVN command to delete all locally missing files
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If you are using TortoiseSVN, just do a Check for Modifications, sort by the Status column, select all the entries marked missing, right-click to open the context menu, and select Delete. Finally, commit to publish the change...
Java - No enclosing instance of type Foo is accessible
...ch (by definition) is associated with a particular instance of Hello (even if it never uses or refers to it), which means it's an error to say new Thing(); without having a particular Hello instance in scope.
If you declare it as a static class instead, then it's a "nested" class, which doesn't ne...
Equivalent of String.format in jQuery
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Warning: This will format recursively: so if you have {0}{1}, {0} will be replaced first, and then all occurrences of {1} in both the already-substituted text and the original format will be replaced.
– Zenexer
Jul 1 '13 at 18:1...
How do I search within an array of hashes by hash values in ruby?
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As a note, if you wanted only to find a single one (the first one) you can use @fathers.find {|father| father["age"] > 35 } instead.
– Leigh McCulloch
Jun 1 '14 at 7:35
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Find unmerged Git branches?
...). You can also pull up the inverse with:
git branch --no-merged master
If you don't specify master, e.g...
git branch --merged
then it will show you branches which have been merged into the current HEAD (so if you're on master, it's equivalent to the first command; if you're on foo, it's equi...
How default .equals and .hashCode will work for my classes?
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Yes, the default implementation is Object's (generally speaking; if you inherit from a class that redefined equals and/or hashCode, then you'll use that implementation instead).
From the documentation:
equals
The equals method for class Object implements the most discriminating possi...