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How to create a temporary directory?
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Good point, updated the script to check if the temp dir could be created.
– Ortwin Angermeier
Mar 7 '17 at 17:02
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HashMap get/put complexity
...epends on the hash implementation. The default object hash is actually the internal address in the JVM heap. Are we sure it is good enough to claim that the get/put are O(1) ?
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What's the best way to share data between activities?
...Here a compilation of most common ways to achieve this:
Send data inside intent
Static fields
HashMap of WeakReferences
Persist objects (sqlite, share preferences, file, etc.)
TL;DR: there are two ways of sharing data: passing data in the intent's extras or saving it somewhere else. If data is p...
What is tail recursion?
...sum(x - 1);
}
}
If you called recsum(5), this is what the JavaScript interpreter would evaluate:
recsum(5)
5 + recsum(4)
5 + (4 + recsum(3))
5 + (4 + (3 + recsum(2)))
5 + (4 + (3 + (2 + recsum(1))))
5 + (4 + (3 + (2 + 1)))
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Note how every recursive call has to complete before the JavaScri...
Android preferences onclick event
...referenceClick(Preference preference) {
//open browser or intent here
return true;
}
});
share
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Naming of ID columns in database tables
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Agree, and you point out the main reason not use "id" ,because the we always have table alias such as "i" for inoice, p for "product" on SQL or LINQ etc.
– Cheung
Oct 13 '14 at 7:50
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Creating functions in a loop
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You're running into a problem with late binding -- each function looks up i as late as possible (thus, when called after the end of the loop, i will be set to 2).
Easily fixed by forcing early binding: change def f(): to def f(i=i): like...
How to move columns in a MySQL table?
... work, for example, in PostgreSQL or many other DBMSs.
Another edit: As pointed out by @Luis Rossi in a comment, you need to completely specify the altered column definition just before the AFTER modifier. The above examples just have VARCHAR(50), but if you need other characteristics (such as NOT ...
Controlling the screenshot in the iOS 7 multitasking switcher
...OS 7 and especially the screenshot that the OS takes when the app is going into hibernation.
8 Answers
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What causes imported Maven project in Eclipse to use Java 1.5 instead of Java 1.6 by default and how
...and "maven.compiler.target" properties must have some Eclipse Maven plugin interaction as the problem just vanished.
– JasonTolotta
Mar 19 '19 at 1:55
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