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Is there any performance reason to declare method parameters final in Java?
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The final keyword does not appear in the class file for local variables and parameters, thus it cannot impact the runtime performance. It's only use is to clarify the coders intent that the variable not be changed (which many consider dubious reason for its usage), and dealing with anonymous inn...
How to use java.String.format in Scala?
...d know how it should display the string. %s is probably the most common, and it just means that the argument should be treated as a string.
I won't list every option, but I'll give a few examples just to give you an idea:
// we can specify the # of decimals we want to show for a floating point:
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JavaScript hashmap equivalent
...doo.
When using objects as maps, you have to remember that the key will be converted to a string value via toString(), which results in mapping 5 and '5' to the same value and all objects which don't overwrite the toString() method to the value indexed by '[object Object]'. You might also involuntar...
Why doesn't “System.out.println” work in Android?
...onsole, so that I can debug it. But for some reason, nothing prints in my Android application.
11 Answers
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python plot normal distribution
Given a mean and a variance is there a simple function call which will plot a normal distribution?
8 Answers
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When do we have to use copy constructors?
...ovided copy constructor will break the internal intra-object associations, converting them to inter-object associations.
An example:
struct MarriedMan;
struct MarriedWoman;
struct MarriedMan {
// ...
MarriedWoman* wife; // association
};
struct MarriedWoman {
// ...
MarriedMan*...
What are the benefits of Java's types erasure?
...erned with the Twitter user. It's helpful to keep focused on the messages and not the messenger. There is a fairly consistent message with even just the excerpts mentioned thus far:
It's funny when Java users complain about type erasure, which is the only thing Java got right, while ignoring all ...
Split string with dot as delimiter
...name.split("\\.");
(one '\' to escape the '.' in the regular expression, and the other to escape the first one in the Java string)
Also I wouldn't suggest returning fn[0] since if you have a file named something.blabla.txt, which is a valid name you won't be returning the actual file name. Instea...
@property retain, assign, copy, nonatomic in Objective-C
...retain is the same as strong.
-apple says if you write retain it will auto converted/work like strong only.
-methods like "alloc" include an implicit "retain"
Example:
@property (nonatomic, retain) NSString *name;
@synthesize name;
assign
-assign is the default and simply performs a variable...
What is a Question Mark “?” and Colon “:” Operator Used for? [duplicate]
Two questions about using a question mark "?" and colon ":" operator within the parentheses of a print function: What do they do? Also, does anyone know the standard term for them or where I can find more information on their use? I've read that they are similar to an 'if' 'else' statement.
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