methods

问题 Hope anyone can help, i am learning Java and as comparable to anyone else in this forum i guess i am a newbie to programming as well. I have come across a chapter on abstract class and methods but don't really fully understand what they are used for and why, and thought i would get an explanation from someone who is an experienced programmer. Below i have example code i have been working on, with the help from this book, what i am not sure about is why in the class Dims do i have to have

问题 This question already has answers here : How to return multiple objects from a Java method? (25 answers) Closed last year . I have a method which calculates the square root of only negative numbers (which is sqrt(x)=sqrt(-x) +"*i" , where x is a double and "*i" is a string) the problem I have is that this method returns a double and a string which are two different variable types, so the question is how do I make this method return both?: public static **(what goes here?)** myFunction(double

问题 I need to catch scrolling events inside my custom ListView Adapter, so I have implemented OnScrollListener in it, but its methods are not being called. I was looking everywhere for an answer but without any luck, no errors no exceptions. What could be wrong? ListView Adapter: import java.util.ArrayList; import android.app.Activity; import android.content.Context; import android.text.Editable; import android.text.TextWatcher; import android.view.LayoutInflater; import android.view.View; import

问题 This question already has answers here : making an instance before calling non static method in java (4 answers) Closed 5 years ago . I am slowly but surely working my way through java and have gotten a program to work. However, the program I am using has all of the code in the main method and I'd like to use other methods to keep things better organized. My question is very simple so I will use the simplest of examples. Say I wanted to create a Hello World program like this: public class

问题 I am having trouble trying to get this program to loop if user enter 'y' they'd like to continue. I'm super new to programming by the way so any help is greatly appreciated. I figured the best was to add a do/while in main and as k the user if they'd like to continue at the end of the code but, I quickly realized that wouldn't work unless I called the previous methods for user input and output. That's where the issue is arising. Thanks again for any help! /* • Ask the user if they want to

问题 Right now, I'm trying to find the odd and even numbers of an array. Here's the code of what I have so far. I know my findEvens() and findOdds() methods are messed up because they keep giving me off values whenever I try to print the final result. For example, if I try to find the odds of {1,5,8,3,10}, it gives me {5,3,0}. And if I try to find the evens of {2,5,8,7,19}, it gives me {2,8,0}. Anyone know why? public class Scores { private int[] numbers; public Scores(int[] numbersIn) { numbers =

问题 Just like the question said. Is possible to set global button(not in the class) to activate global method directly? I confused on setting target and action part. import "Global.h" void methodA() { UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundRect]; button.frame = CGRectMake(0,441,100,30); [button addTarget:??? action@selector(methodB????) forControlEvent...]; } void methodB() { } //end of file 回答1: What you are trying to do is set up a nil-targeted action that works with the

问题 i was wondering whats the best way to route to pages in codeigniter? Say for example user wants to route to the index page, but should i create a method in a controller that just fo rthat page, or what is better way? 回答1: No need to create separate methods or controllers. Here's how I do it: class Pages extends CI_Controller { function _remap($method) { is_file(APPPATH.'views/pages/'.$method.'.php') OR show_404(); $this->load->view("pages/$method"); } } So the url http://example.com/pages

问题 How can I inject a custom method into a .net assembly using mono.cecil, and then call it in the entrypoint? I like to do this to implement security methods after the binary is built. 回答1: To inject method you need to get the type you want to add it the method and then add a MethoDefinition . var mainModule = ModuleDefinition.ReadModule(assemblyPath); var type = module.Types.Single(t => t.Name == "TypeYouWant"); var newMethodDef= new MethodDefinition("Name", MethodAttributes.Public, mainModule

问题 I have a have a class that has a method which takes a string. Then I have a method which returns the value of the above method. When ever I get the return value in my main class and print it the printed value is "ExamQuestion@143c8b3". How do I get it to print correctly? Thanks 回答1: Whenever you get the format "@" this is the default format of an object's toString() method. Calling System.out.println(question); calls ExamQuestion.toString() . If the method isn't overridden, the version in the