clone

问题 In my Java project, I have a vector of various types of Traders. These different types of traders are subclasses of the Trader class. Right now, I have a method that takes a Trader as an argument and stores it 50 or so times in the vector. I am having problems because storing the same object 50 times is just storing 50 references of the same object. I need to store 50 copies of the object. I've researched about implementing Clone, but I don't want the programmers defining a type of Trader to

问题 In my Java project, I have a vector of various types of Traders. These different types of traders are subclasses of the Trader class. Right now, I have a method that takes a Trader as an argument and stores it 50 or so times in the vector. I am having problems because storing the same object 50 times is just storing 50 references of the same object. I need to store 50 copies of the object. I've researched about implementing Clone, but I don't want the programmers defining a type of Trader to

问题 Ruby defines #clone in Object . To my suprise, some classes raise Exceptions when calling it. I found NilClass , TrueClass , FalseClass , Fixnum having this behaviour. 1) Does a complete list of classes (at least core-classes) exist, which do not allow #clone ? Or is there a way to detect if a specific class supports #clone ? 2) What is wrong with 42.clone ? 回答1: I don't think there is a formal list, at least unless you count reading the source. The reason 2) doesn't work is because of an

问题 I am trying to copy the entire tree (exactly all nodes) of a treeview (completely) to another treeview using this code: TreeNodeCollection myTreeNodeCollection = treeView1.Nodes; TreeNode[] myTreeNodeArray = new TreeNode[treeView1.Nodes.Count]; treeView1.Nodes.CopyTo(myTreeNodeArray, 0); treeView2.Nodes.AddRange(myTreeNodeArray); But this does not allow me to do so, it asks to either delete the nodes in source treeview or use it Clone! How can I do that? I dont want my source treeview to lose

问题 I am trying to copy the entire tree (exactly all nodes) of a treeview (completely) to another treeview using this code: TreeNodeCollection myTreeNodeCollection = treeView1.Nodes; TreeNode[] myTreeNodeArray = new TreeNode[treeView1.Nodes.Count]; treeView1.Nodes.CopyTo(myTreeNodeArray, 0); treeView2.Nodes.AddRange(myTreeNodeArray); But this does not allow me to do so, it asks to either delete the nodes in source treeview or use it Clone! How can I do that? I dont want my source treeview to lose

问题 I have a jQuery-based form where you can add extra people to the application. I'm cloning the first fieldset and adding it onto the end up to a max of 3 additional people. When you've added 1 extra person then you have the option to remove that person. However, my remove button isn't working. It was, earlier, until I added the extra functions to the cloning to change the ids of other elements within the fieldset. I'm using: $(".remove").click(function() { $(this).parent().remove(); which was

问题 I have a jQuery-based form where you can add extra people to the application. I'm cloning the first fieldset and adding it onto the end up to a max of 3 additional people. When you've added 1 extra person then you have the option to remove that person. However, my remove button isn't working. It was, earlier, until I added the extra functions to the cloning to change the ids of other elements within the fieldset. I'm using: $(".remove").click(function() { $(this).parent().remove(); which was

问题 In a book on Core Java, I found this excerpt : Think about the way in which the Object class can implement clone. It knows nothing about the object at all, so it can make only a field-by-field copy. If all data fields in the object are numbers or other basic types, copying the fields is just fine. But if the object contains references to subobjects, then copying the field gives you another reference to the subobject, so the original and the cloned objects still share some information. After

问题 I've just finished cruising the Google search results that contain all the email rants about how stupid it is that git can't clone an empty repository. Some kind soul even submitted a patch. Until git is upgraded, what is the simplest, most straightforward method to clone an empty, bare git repository? The ideal solution will support the -o option to give the remote repo a name other than origin , and it will be implementable as a simple shell script, e.g., git-clone-empty-repo . (Why I want

问题 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: