I tried to find a similar question on SO but had no luck. Apologies if it\'s a duplicate. What are drawbacks to in开发者_高级运维stantiating class-type variables when they are declared?
I have an application that has a Service that uses an ArrayList<Double> to store numbers in the background for a very long time; the variable is initialized when the service started.
The this keyword is optional when accessing instance fields, properties, and methods in languages like C# and Java.
I am working on a ruby program and have run into the following problem. I have two classes AClass and BClass as follows:
I have really heavy task to achieve and I haven\'t found any solution good enough. So, here is the description:
Let\'s say I have a Gift object with @name = \"book\" & @price = 15.95. What\'s the best way to convert that to t开发者_运维问答he Hash {name: \"book\", price: 15.95} in Ruby, not Rails (although
Whats the difference between variable declared in interface (in \".h\" file) and in implementation in (in .m file)??开发者_C百科Data declared inside the brackets in an @interface { ... } ... @end bloc
I see it recommended all over the place when coding for iOS that properties should be used for accessing instance variables because of the benefits this lends to memory management, among other things.
In my case the implementator shall be able to \"update\" an object. //creating an instance (follows the active record pattern)
I have the following code: // ClassA.h @interface ClassA : NSObject @property (nonatomic, retain, readonly) id my_property;
加载中,请稍侯......