class

问题 I have a primary class as below: public class classB{ public classC getObject(String getstring){ return new classC(getstring); } } The classC has a contructor: public class classC{ String string; public classC(String s){ this.string = s; } public methodC(int i){ <using the `string` variable here> } } Now I've a classA which will be using the object created in classB (which is of course, an instance of classC ). public classA{ int a = 0.5; <Get the object that was created in classB>.methodC(a)

问题 Is it possible to change the class of a Ruby object once it has been instantiated, something like: class A end class B end a = A.new a.class = B or similar. (the above code does not run as class is a read only variable) I know this is not advisable, a bit strange, and not something I plan on doing, but is it possible? 回答1: No, this is not possible from within ruby. It is theoretically possible from within a C extension by changing the klass pointer of the given object, but it should be noted

问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 6 years ago . I tried using the answer @Greg Snow provided in this question, but I keep getting a warning regardless of what I do. Can someone help with this:? > setAs

问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 6 years ago . I tried using the answer @Greg Snow provided in this question, but I keep getting a warning regardless of what I do. Can someone help with this:? > setAs

问题 This question was already asked in the context of C#/.Net. Now I'd like to learn the differences between a struct and a class in C++. Please discuss the technical differences as well as reasons for choosing one or the other in OO design. I'll start with an obvious difference: If you don't specify public: or private: , members of a struct are public by default; members of a class are private by default. I'm sure there are other differences to be found in the obscure corners of the C++

问题 I'm working with a string vector with a structure corresponding to the one below: messy_vec <- c("0 - 9","100 - 150","21 - abc","50 - 56","70abc - 80") I'm looking to change a class of this vector to factor which levels would be ordered according to the first digit(s) . The code: messy_vec_fac <- as.factor(messy_vec) would produce > messy_vec_fac [1] 0 - 9 100 - 150 21 - abc 50 - 56 70abc - 80 Levels: 0 - 9 100 - 150 21 - abc 50 - 56 70abc - 80 whereas I'm interested in obtaining vector of

问题 This question already has answers here : Java Class.forName() from distant directory (3 answers) Closed 6 years ago . I get this really (stupid) error from Java Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: models/modelclass (wrong name: models/ModelClass) So I am typing in a command at the command line, and I would rather not type the proper case of the class name. I'd like to type "modelclass" instead of "ModelClass". Is there a way to solve this? Why does this

问题 i have written an application, but for some reason it keeps peaking at 100%. I ran a profile r on a few of the classes and a report show that isReset() and isRunning() seems to be called alot of times. Do you see anything wrong please inform me. thanks Class 1 is the only class that uses the isReset() code so i hope this helps u guys in detecting the error Class 1 package SKA; /* * ver 0.32 June 2009 * * Bug Fix Release: * * Fixed Array resize * Fixed Red Black Tree delete method * Fixed Red

问题 I created a phpMailer class and call it into my register.php file all fine. But dont find a way how to send emails from class. Here is my class: class mailSend { public function sendMail($email, $message, $subject) { require_once('PHPMailer/src/Exception.php'); require_once('PHPMailer/src/PHPMailer.php'); require_once('PHPMailer/src/SMTP.php'); $mail = new PHPMailer\PHPMailer\PHPMailer(); try { $mail->SMTPDebug = 0; $mail->isSMTP(); $mail->Host = "smtp.gmail.com"; $mail->SMTPAuth = true;

问题 I'm making a blackjack program in Java, and I was starting to write the class declaration for an object Card. Will this be sufficient, or are there some methods I should have that I'm glossing over? public class Card { public int suit; //Value 1-4 to represent suit public int value; //Value 1-13 to represent value (i.e. 2, J) public Card(int suit, int value) { //Not yet implemented } } Also, is there a good way to have an something like C++'s enum data structure in Java, because that would be