setter

问题 I've been tooling around with Ruby by converting a pen and paper RPG to a script. Right now I have a character's stats kept in a hash, which I would like to be able to set via public method. I got that working with: class Character attr_reader :str, :con, :dex, :wis, :int, :level, :mods, :stats def initialize str, con, dex, wis, int, cha, level = 1 @stats = { :str => str, :con => con, :dex => dex, :wis => wis, :int => int, :cha => cha } @mods = {} @level = level @stats.each_pair do |key,

问题 Im a little confused on adding objects to an array of 7 objects. I have a for loop and I want to add an item object with 3 arguments. I have used set and get for this. At the end of the for loop, id like to .add item object to the array list. When I try to do this I get an error: Exception in thread "main" java.lang.NullPointerException at item.add(item.java:88) at homework3main.main(homework3main.java:38) There are no errors flags on the lines 88 in item class and 38 in main, so I dont know

问题 I realise that this has been asked but have researched and failed - sorry! I want to implement encapsulation in JS as simply as possible. I realise that any 'var' in the class will be private. I am simply unsure how to GET and SET values of any private var. In the example below the interface methods for GETTING and SETTING 'colour' do not work because those functions cannot access the private 'colour' property of the object. I cannot find a clear example showing me how to implement this. I am

问题 The actual problem I am facing is to be able to force a eclipselink update irrespective of the content of the cache. Currently eclipselink doesn't create new update statements if the new update has the same value as in the cache. I don't want to use the refresh property( ) in the persistence xml. I am looking for a solution where I can specify to the entity being update not to use the values in the cache. EntityManager em=getEntityManager(); EntityTransaction t = em.getTransaction(); t.begin(

问题 This question already has answers here : Why are C# structs immutable? (5 answers) Closed 5 years ago . I was reading a book and found out that structs are actually immutable objects. But they have getters and setters. I was wondering if a property of structs can be changed after it has been created. public struct Test { public string str {get; set; } public int int1 {get; set; } } Can the values of 'str' and 'int1' be changed once they have been assigned a value? 回答1: Structs can be either

问题 I'm using a library called which takes a JS object as an input. Unfortunately, the JSONP api that I am using returns an object containing getters and setters, which this particular library does not know how to handle. How can I remove all getters and setters from an object while retaining the values of the properties, so I have a Plain Old JavaScript Object? 回答1: a solution for this special case/environment/setting might look like that ... var obj = JSON.parse(JSON.stringify(model)); console

问题 If I don't want to expose the state of my object, but I still need to display it (in HTML, XML or JSON let's say), how would I go about doing that in an MVC environment. Does it make sense to have an export method which exports a dumbed down immutable object (a "data class" if you will). What about adding in a render method which talks to an interface? Are there any other approaches to this problem? 回答1: The render method comes the closest to not exposing state. Another method (well-known to

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 5 years ago . I am trying to write an abstract class. This class is going to be a Field. There will be different types of fields which will need to extend the field class and write its own setter class. For example....There will be a String Field and an Integer Field. String Field will need to extend the Field

问题 I fear I am being stupid. I've spent about three hours tracking down a memory leak that's been destroying my sanity and after commenting out half my app I have come to the following conclusion. Given the following in the right places. NSString *blah; @property (nonatomic, retain) NSString *blah; @synthesize blah; -(id)initWithBlah:(NSString*)b { self.blah = b; //this leaks blah = b; //this does not } I am not particularly experienced with objectice c, I understand that outside of the class if

问题 How do I fix this error? Variable with getter/setter cannot have an initial value Here's my code: func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { var cell: UITableViewCell = tableview.dequeueReusableCellWithIdentifier("cell") as UITableViewCell { //Error cell.textLabel?.text = self.items[indexPath.row] //Error return cell; //Error } } 回答1: I think you have an extra set of {} As it is, you're defining a block and assigning it to the