clone

问题 It's too late to change the question, but more precise would have been to ask "Why does clone() not allow singletons?". A copy() method would be more convenient. Is there any reason why enums in Java cannot be cloned? The manual states that This guarantees that enums are never cloned, which is necessary to preserve their "singleton" status. But returning the instance itself would also preserve its status, and I would be able to handle associated enums the same way as other clonable objects.

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 7 years ago . I've searched and I've found a lot that are antiquated. Any suggestions? 回答1: You can easily create a wiki with zena (a rails CMS): You create an empty application with zena wiki You initialize an empty database cd wiki; rake zena:init RAILS_ENV=production You set the publish, write and read groups of a node to

问题 I cloned my fieldset and it works perfect. I clear all fields value perfectly. The only issue I'm having is the rules follow if submit had been hit before adding the new fieldset and no if you haven't hit on submit. What I really want is to be able to either remove all the rules and set it up again or keep the rules in a way they work properly. I tried to remove the rules and it didn't work (). I tried adding new rules, it works but I have 1 more rule for each field every time I add a section

问题 I am trying to create a deep clone of an object using the following method. public static T DeepClone<T>(this T target) { using (MemoryStream stream = new MemoryStream()) { BinaryFormatter formatter = new BinaryFormatter(); formatter.Serialize(stream, target); stream.Position = 0; return (T)formatter.Deserialize(stream); } } This method requires an object which is Serialized i.e. an object of a class who is having an attribute "Serializable" on it. I have a class which is having attribute

问题 This question already has answers here : How do I do a deep copy of a 2d array in Java? (6 answers) Closed 4 years ago . I have two multidimensional arrays (well actually they're only 2D) which have inferred size. How do I deep clone them? Here's what I have gotten so far: public foo(Character[][] original){ clone = new Character[original.length][]; for(int i = 0; i < original.length; i++) clone[i] = (Character[]) original[i].clone(); } A test for equality original.equals(clone); spits out a

问题 Hi guys, from the picture above, I want to clone the div with id #car2 and append it after the last div with id start with car, in this example id #car5. How i can do that? Thanks. This is my try code: $("div[id^='car']:last").after('put the clone div here'); 回答1: You can use clone, and then since each div has a class of car_well you can use insertAfter to insert after the last div. $("#car2").clone().insertAfter("div.car_well:last"); 回答2: try this out $("div[id^='car']:last").after($('#car2'

问题 I am cloning elements as they are dragged out of a JQuery UI Draggable list using JQuery's clone() method. Looking at the clone() documentation, I see that I can clone events already bound to these elements by passing one or two Boolean arguments (true,true) to the clone() method. It's with passing these arguments that things get weird. If I just use clone() as shown below, things work as expected. $(".draggable").draggable({ connectToSortable: ".sortable", helper: function(e) { return $(this

问题 I'd like to try out a few things with git and I don't want to screw anything up in the working repository. To try to keep things safe, I've made a copy of the bare repo that I work from and from this repo I am intending to do all my pushes and tagging. I used: cp --preseve -r original.git copy_of_original.git Although I understand one can undo bad commits and whatnot, I don't want to leave the repo with all these reverted commits, nor do I want to do any refactoring, hence my desire to just

问题 This seems like a simple question which should have a simple answer... I'm trying to checkout a GitHub project. The project is owned by someone else, so someone else is the Owner . GitHub Collaborators have read/write access, and I have been granted collaborator rights on the project. Collaborators are slightly different than Contributors , who have simply provided a pull request in the past. I'm trying to avoid the following because I do not want the source files in "read-only" mode: git

问题 I'm trying to script (powershell/powercli) the cloning of our QA environment (261 servers). Basically I want to make a new copy of each server just changing the VM name, the hostname, and the IP address. Ideally I'd want the new clone on the domain (90% of them are Windows OS). And many of my servers have many large hard drives that won't all fit on one datastore so I have to be able to clone to multiple datastores. I started off with New-VM for the servers that were small enough to fit on