methods

问题 I don't know if it is possible, but I would like to call a view controller's method in a class object. I have method like this in my view controller's .m file: -(void)showLeaderBoard { GKLeaderboardViewController *leaderboardController = [[GKLeaderboardViewController alloc] init]; if (leaderboardController != nil){ leaderboardController.leaderboardDelegate = self; [self presentModalViewController: leaderboardController animated: YES]; } } I would like to call that method in a SKScene file.

问题 In java there is a string class method that works as seen bellow. But I wonder how is it that we are able to call the method on a random variable of type string? String word = "hello" word.equals("hello"); output is true 回答1: The equals() method is used to verify if the state of the instances of two Java classes is the same. Because equals() is from the Object class, every Java class inherits it. But the equals() method has to be overridden to make it work properly. Of course, String

问题 After a thorough search and quite a lot of thinking, I couldn't find a solution to the following problem in AndroidStudio: I have 2 spinners (input and output). I want to pass the value of the input spinner to a method that is called upon selection of a value of the output spinner (onItemSelected). The regarding code passage looks as follows: private void setupSpinnerListeners() { spinnerLengthInput.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void

问题 How do I modify computeBalance() making sure that the amounts enetered in the JTextField is positive ( which I think I did) and is without cents? Example: 100.19 and -49.8 is not acceptable. public class ATMbizlogic { private double totalBalance; private boolean rightPinEntered; /** * Creates a new instance of ATMbizlogic */ public ATMbizlogic() { totalBalance = 0.0; rightPinEntered = true; } public void computeBalance(double withdraw, double deposit) throws ATMexception { if(withdraw <=0)

问题 Consider this: class A { int x =5; } class B extends A{ int x =6; } public class CovariantTest { public A getObject() { return new A(); } /** * @param args the command line arguments */ public static void main(String[] args) { // TODO code application logic here CovariantTest c1 = new SubCovariantTest(); System.out.println(c1.getObject().x); } } class SubCovariantTest extends CovariantTest { public B getObject(){ return new B(); } } As far as I know, the JVM chooses a method based on the true

问题 So I'm still chugging along with learning how to code in Ruby and I've come across something new that I'm curious about. My teacher just started teaching us about methods and I was wondering if you could call/create a method based on an if-else statement. Like for example if you had a program that asked the user to type in someone's name could you then use that input to decide which method would be used? example: puts "Please enter name(Brian, Andy, Tod)" string = gets.to_i if string ==

问题 Lets say my file looks like this: #include <iostream> #include <string> using namespace std; class testclass{ public: string name; //testclass(const string& sref){ // name = sref; //} testclass(string str){ name = str; } ~testclass(){} }; int main(){ testclass t1("constStringRef"); cout << t1.name << '\n'; } What are the differences between constructor 1 and 2 given the following constructor-call: testclass tobj("tmemberstring"); Here is what i thought of: I know that passing by reference

问题 What is more preferable way to dynamically call some object's method: method = getattr(object, name) method(*args, **kw) Or import operator method = operator.methodcaller(name) method(object, *args, **kw) 来源： https://stackoverflow.com/questions/7821423/preferable-way-to-dynamically-call-some-objects-method

问题 I have a very simple question and just asking to know more about final method arguments. final variables can be initialized just once in its life. In JAVA method arguments are accepted as pass by value and reference is also passed as a value. Now my question is : How method doesn't know that passed object is final and already initialized? Here is sample code: public static void xyz(Abc obj) { System.out.println("hash code in xyz method :"+obj.hashCode()); obj = new Abc(); // here there is no

问题 I have two methods and I need to use a variable from first as input parameter in the second. How can I do it? My code is : First method -(NSString*)getResponseData :(NSString*) apiHttp { NSString *code = @"&code="; NSString *finalLink = [[NSString alloc] initWithFormat:@"%@%@",apiHttp,phoneNumber]; NSURLRequest *request = [NSURLRequest requestWithURL: [NSURL URLWithString:finalLink]]; NSLog(@"%@", finalLink); __block NSDictionary *json; [NSURLConnection sendAsynchronousRequest:request queue: