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scala vs java, performance and memory? [closed]
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Superbly put! I grow weary of contrived examples whereby inflated Java code is followed by some carefully constructed, terse example of Scala (or some other FP language) and then a hastily drawn conclusion that Scala must be better than Java because of it. Who ever wrote anythin...
How do I determine the size of an object in Python?
...module.
sys.getsizeof(object[, default]):
Return the size of an object in bytes.
The object can be any type of object.
All built-in objects will return
correct results, but this does not
have to hold true for third-party
extensions as it is implementation
specific.
Only the memory consumption direc...
Getting “unixtime” in Java
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Avoid the Date object creation w/ System.currentTimeMillis(). A divide by 1000 gets you to Unix epoch.
As mentioned in a comment, you typically want a primitive long (lower-case-l long) not a boxed object long (capital-L Long) for the unixTime variable's type.
long unixTime = System.currentTim...
Android: Go back to previous activity
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I am having the user go by many activities one after the other through intents. Do I need to do anything in order to make sure the app doesn't crash with too many activities on the stack? Thanks!
– Ruchir Baronia
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Replace a character at a specific index in a string?
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Turn the String into a char[], replace the letter by index, then convert the array back into a String.
String myName = "domanokz";
char[] myNameChars = myName.toCharArray();
myNameChars[4] = 'x';
myName = String.valueOf(myNameChars);
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What is the best way to force yourself to master vi? [closed]
A good while ago, I read an article by the creator of viemu , clearing up a lot of the misconceptions about vi, as well as explaining why it's a good idea (and why it's been very popular for the last 30 years+). The same guy also has a great set of graphical cheat sheets that teach the basics a f...
Retina displays, high-res background images
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Do I need to double the size of the .box div to 400px by 400px to
match the new high res background image
No, but you do need to set the background-size property to match the original dimensions:
@media (-webkit-min-device-pixel-ratio: 2),
(min-resolution: 192dpi) {
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Hidden Features of C++? [closed]
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@jpoh: http followed by a colon becomes a "label" which you use in a goto statement later. you get that warning from your compiler because it's not used in any goto statement in the above example.
– utku_karatas
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LESS CSS nesting classes
...u can already compile your existing styles and start re-writing them piece by piece.
– topless
May 8 '13 at 12:34
1
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ConcurrentHashMap vs Synchronized HashMap
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We can achieve thread safety by using both ConcurrentHashMap and synchronisedHashmap. But there is a lot of difference if you look at their architecture.
synchronisedHashmap
It will maintain the lock at the object level. So if you want to perform ...