clone | 易学教程

Java cloning abstract objects

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问题 I'm wondering if there is any way to do the following. I have an abstract class, Shape , and all its different subclasses and I want to override the clone method. All I want to do in the method is create a new Shape from the toString() of the current one. Obviously I can't do the following because Shape is abstract. Is there another way to do this because overriding clone in every subclass just for a simple name change seems useless. public abstract class Shape { public Shape(String str) { //

How can I clone an Object (deep copy) in Dart?

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问题 Is there a Language supported way make a full (deep) copy of an Object in Dart? Secondary only; are there multiple ways of doing this, and what are the differences? Thanks for clarification! 回答1: No as far as open issues seems to suggest: http://code.google.com/p/dart/issues/detail?id=3367 And specifically: .. Objects have identity, and you can only pass around references to them. There is no implicit copying. 回答2: Darts built-in collections use a named constructor called "from" to accomplish

How to Implement Clone and Copy method inside a Class?

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问题 I have class called Employee with 3 property called ID , Name , Dept . I need to implement the Copy and Clone method? When I am using Copy or Clone method I need to avoid Casting? how will I do that?. example: same as DataTable which is having DataTable.Copy() and DataTable.Clone() . 回答1: You need to implement IClonable interface and provide implementation for the clone method. Don't implement this if you want to avoid casting. A simple deep cloning method could be to serialize the object to

Is there an easy/built-in way to get an exact copy (clone) of a XAML element?

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问题 I need to make areas of XAML printable and so have make this button handler: private void Button_Click_Print(object sender, RoutedEventArgs e) { Customer.PrintReport(PrintableArea); } And in PrintReport I pack the frameworkelement into other elements in order to print it in a slightly different way than it is on the screen, like this: public void PrintReport(FrameworkElement fwe) { StackPanel sp = new StackPanel(); sp.Children.Add(fwe); TextBlock tb = new TextBlock(); tb.Text = "hello"; sp

Problem cloning / fetching repository using Git plugin for Hudson on Windows

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问题 Before anybody shoots me down for this - I have already checked every appropriate thread and still not found a solution to my problem. I have Hudson with git plugin installed on windows server (not my choice) and Hudson runs as a service. Git/bin is on the path. However I cannot clone the repository. Here is a shortened display of the console output: Started by user anonymous Checkout:workspace / C:\.hudson\jobs\sdf\workspace - hudson.remoting.LocalChannel@65394b Last Built Revision: Revision

git clone with NTLM proxy hangs after resolving deltas

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I saw here many questions covering git and proxy topics but none of them solves my problem. I am cloning a git repository from Bitbucket. Everything works fine from my home network but hangs at work where we are using proxy with NTLM authentication. See the output of git clone command: $ git clone https://my_user@bitbucket.org/my_user/my_project.git --verbose Cloning into 'my_project'... Password for 'https://my_user@bitbucket.org': POST git-upload-pack (174 bytes) remote: Counting objects: 548, done. remote: Compressing objects: 100% (367/367), done. remote: Total 548 (delta 216), reused 0

I need to implement C# deep copy constructors with inheritance. What patterns are there to choose from?

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I wish to implement a deepcopy of my classes hierarchy in C# public Class ParentObj : ICloneable { protected int myA; public virtual Object Clone () { ParentObj newObj = new ParentObj(); newObj.myA = theObj.MyA; return newObj; } } public Class ChildObj : ParentObj { protected int myB; public override Object Clone ( ) { Parent newObj = this.base.Clone(); newObj.myB = theObj.MyB; return newObj; } } This will not work as when Cloning the Child only a parent is new-ed. In my code some classes have large hierarchies. What is the recommended way of doing this? Cloning everything at each level

difference between DataContract attribute and Serializable attribute in .net

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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 "DataContract" on it but the method is not working with this attribute. I think "DataContract" is also a

How to clone Image?

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问题 I have an Image. I need to make a exactly copy of it and save it to BufferedImage, but there is no Image.clone(). The thing should be inside a calculating loop and so it should be really fast, no pixel-by-pixel copying. What's the best in perfomance method to do this? 回答1: You can draw to a buffered image, so make a blank bufferedImage , create a graphics context from it, and draw your original image to it. BufferedImage copyOfImage = new BufferedImage(widthOfImage, heightOfImage,

Is there any way to clone a repository from the web incrementally?

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问题 I'm on dialup in lousy place (yes, it still happens in 2011), and trying to clone a huge repository. It starts without problem, but every time the dialup disconnects (which is unavoidable, it seems), the !#%$* hg rolls everything back and I'm left again with an empty directory. Is there a solution other than doing it on a remote PC and then downloading the whole thing by FTP or something? 回答1: In a bash-like shell you could do something like this: $ hg init myclone $ cd myclone $ for REV in