methods

问题 I have a method called getTheUserInput in a class which returns a String which updates based on user actions, which is located inside a class called Board.java. I have action which adds data to a String which I know works. In my other class I have a JLabel which has been set to equal the returned String of the method, as follows: JLabel l = new JLabel(b.getTheUserInput()); However, when I run the application no matter what input the user provides, the string updates, but the JLabel stays

问题 I just found this really great ColorFactory class that I am using in my first Swing project. It is really cool: I can now pass a named color from my main class, like "crimson" or "mediumaquamarine" for example, to the createContentPane Container method. Code: frame.setContentPane(ContentPaneCreator.createContentPane("darkorange"));` Question: Do I need the public final void setBackground(Color color, JPanel contentPane) method at all? Can everything be done inside createContentPane() method

问题 it might be strange what i'm trying to see and i will try to clarify as much as possible. I'm using gcc 4.8 on ubuntu 14.04 and C++11. What i want trying to do is: make a class A make a function in that class A which gets as argument a pointer to a class member of the same class make a new class B which inherits from A make a new method of class B give a pointer to that method of class B to a method of parentclass A as argument class A{ typedef void(A::*METHOD); void executeMethod(METHOD arg)

问题 I wish to write a macro, to be used within any method, which references the method's selector. I do not wish to pass the literal name of the method. For example: #define RERUN [self performSelector:{something} withObject:nil afterDelay: 0.0] where the "{something}" in the above would resolve to the selector of whatever method the macro was used in. Is there some way to do this? 回答1: _cmd represents the selector of the current method -- it is a hidden argument (like self ). if you never need

问题 I have the following class defined in a foo.h header file class Foo { public: inline int Method(); }; inline int Foo::Method() { // Implementation } I would like now to move the implementation to a foo.cpp file. To this end, I have to remove the inline keyword and move the implementation of the method to a foo.cpp file like this #include `foo.h` inline int Foo::Method() { // Implementation } I have two questions: Is my statement about the removal of the inline keyword correct? Should it be

问题 I have the following methods: void Method(string param1, string param2); void Method(string param1, object param2); When I call the method using the following: method("string", null); It gives me an error because the call is ambiguous, the compiler does not know which version to call, because both methods accept null as the second parameter. How do I overcome this without changing the method name in one of them? the first method will never have null . 回答1: The problem is that both string and

问题 It's a simple and maybe trivial question: in Java how can I iterate through the parameters passed to the method where I'm working? I need it to trim() all of them that are strings. EDIT To be more precise an example of use can be this (written in a pseudo-code reflecting how I wish it to work): public void methodName(String arg1, int arg2, int arg3, String arg4, double arg5) for(Object obj : getThisMethod().getParameters() ) System.out.println(obj.getName() + " = " + obj.toString()) The point

问题 I currently am stuck on a small part of an assignment I need to do. One requirement of the assignment is "Call a function that prompts the user for each of the values of the coefficients a, b, and c for the quadratic equation and returns the value entered, with error checking for a valid input (scanf returned a value)." and I can't figure out how to do this. I can easily prompt the user for input and I can check if it is valid input, but I don't know how to turn this into a function. My

问题 I was reading this article on why getter and setters are evil. The article doesn't say not to use them ever, but, it's telling you to think in a way that limits the use of those methods, or to quote the article: Don't ask for the information you need to do the work; ask the object that has the information to do the work for you. what happens when you need to display data in a GUI, but don't have getter methods? The article covers this briefly, but not fully. It mentions passing a JComponent

问题 Can i ask what the function of setTimeOut method in javascript?As below: function startTime() { var today=new Date(); var h=today.getHours(); var m=today.getMinutes(); var s=today.getSeconds(); // add a zero in front of numbers<10 m=checkTime(m); s=checkTime(s); document.getElementById('txt').innerHTML=h+":"+m+":"+s; t=setTimeout('startTime()',500); } 回答1: Not sure you what you want. setTimeout is a method of the global window object. It executes the given function (or evaluates the given