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How can I combine two HashMap objects containing the same types?
...re is a way to merge two maps into fast immutable one with Guava that does least possible intermediate copy operations:
ImmutableMap.Builder<String, Integer> builder = ImmutableMap.<String, Integer>builder();
builder.putAll(map1);
map2.forEach((k, v) -> {if (!map1.containsKey(k)) bui...
Does MySQL index foreign key columns automatically?
...index automatically if you do an ALTER TABLE (instead of CREATE TABLE), at least according to the docs (the link is for 5.1 but it's the same for 5.5):
[...] When you add a foreign key constraint to a table using ALTER TABLE, remember to create the required indexes first.
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How to call a method with a separate thread in Java?
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If you are using at least Java 8 you can use method runAsync from class CompletableFuture
CompletableFuture.runAsync(() -> {...});
If you need to return a result use supplyAsync instead
CompletableFuture.supplyAsync(() -> 1);
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Run a Java Application as a Service on Linux
...rvice as well, I would go for the systemd version, since it's the easiest, least verbose, and best integrated into modern distros (and even the not-so-modern ones like CentOS 7.x).
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Using Python 3 in virtualenv
...-zero exit Am I missing something? With the --without-pip option, it at least creates the venv with activate/deactivate scripts correctly.
– monkut
Mar 6 '17 at 2:15
3
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What is the difference between attribute and property? [closed]
...or something.
To be fair though, in Computer Science these two words, at least for the most part, can be used interchangeably - but then again programmers usually don't hold degrees in English Literature and do not write or care much about grammar books :).
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Returning value from Thread
...;
int value = foo.getValue();
tl;dr a thread cannot return a value (at least not without a callback mechanism). You should reference a thread like an ordinary class and ask for the value.
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Can Google Chrome open local links?
... the link, users will have to right-click and choose Open in IE, but it at least makes the link functional.
One thing to note though, in IE10 (and IE9 after a certain update point) you will have to add the site to your Trusted Sites (Internet Options > Security > Trusted sites). If the site ...
optional local variables in rails partial templates: how do I get out of the (defined? foo) mess?
...sh contains :foo mapped to nil, then fetch it will return nil. That is, at least on my v1.9.3. I don't remember how 1.8 behaved.
– quetzalcoatl
Aug 14 '13 at 19:14
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Writing a list to a file with Python
... print >> f, item
If you're keen on a single function call, at least remove the square brackets [], so that the strings to be printed get made one at a time (a genexp rather than a listcomp) -- no reason to take up all the memory required to materialize the whole list of strings.
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