methods

问题 How do I find the mode (most frequent value in an array) using a simple for loop? The code compiles with a wrong output. Here is what I have: public static void mode(double [] arr) { double mode=arr[0]; for(int i = 1; i<arr.length; i++) { if(mode==arr[i]) { mode++; } } return mode; } 回答1: First I sort the array by order and then I count occurrences of one number. No hashmaps only for loop and if statements. My code: static int Mode(int[] n){ int t = 0; for(int i=0; i<n.length; i++){ for(int j

问题 I've been looking into Golang and have been implementing a few data structures to learn how the language works. I've come across the following issue while writing the code for an AVL tree: Assigning the primary pointer from a struct pointer method seems to have no effect outside the scope of the function. E.g. tree.rotateLeftToRoot() doesn't result in tree.left becoming the new tree. Question: Is there a way to reassign the pointer in a struct pointer method in Golang, or is this generally

问题 I would like to use permission for android 6 in my app but i saw a strange event. Perhaps you can help me about that. If you start your app with "Dangerous" permissions, these permissions appears in the "App permissions" of your android device. PERFECT! BUT if you keep your app in background, go to the "App permissions" menu, disable (you can enable and then disable it) a permission and go back to your app, android never go to onStart (Fragment or activity) ?! And never go there again. If you

问题 Im getting this error: HTTP Status 405 - Request method 'POST' not supported What I am trying to do is make a form with a drop down box that get populated based on the other value selected in another drop down box. For example when I select a name in the customerName box the onChange function in the .jsp page should be run and the page submitted then loaded again with the corresponding values in the customerCountry box. however I'm getting this HTTP Status 405 error. I have searched the

问题 Im getting this error: HTTP Status 405 - Request method 'POST' not supported What I am trying to do is make a form with a drop down box that get populated based on the other value selected in another drop down box. For example when I select a name in the customerName box the onChange function in the .jsp page should be run and the page submitted then loaded again with the corresponding values in the customerCountry box. however I'm getting this HTTP Status 405 error. I have searched the

问题 I am new to Python and I have written this simple script: #!/usr/bin/python3 import sys class Hello: def printHello(): print('Hello!') def main(): helloObject = Hello() helloObject.printHello() # Here is the error if __name__ == '__main__': main() When I run it ( ./hello.py ) I get the following error message: Traceback (most recent call last): File "./hello.py", line 13, in <module> main() File "./hello.py", line 10, in main helloObject.printHello() TypeError: printHello() takes no arguments

问题 I've searched and found many articles that discuss the common methods you can use in javascript to control HTML audio elements. However, I have not been able to find anywhere that lists all of the methods available. I should make it clear that I'm not looking for HTML audio attributes. I'm looking for methods like audio.play() and audio.pause() . I've seen these methods used in code samples all over the place, but I can't find an exhaustive list for the life of me. 回答1: You're looking for

问题 I've searched and found many articles that discuss the common methods you can use in javascript to control HTML audio elements. However, I have not been able to find anywhere that lists all of the methods available. I should make it clear that I'm not looking for HTML audio attributes. I'm looking for methods like audio.play() and audio.pause() . I've seen these methods used in code samples all over the place, but I can't find an exhaustive list for the life of me. 回答1: You're looking for

问题 How would one go about checking to see if a method exists for a class in Java? Would a try {...} catch {...} statement be good practice? 回答1: I assume that you want to check the method doSomething(String, Object) . You might try this: boolean methodExists = false; try { obj.doSomething("", null); methodExists = true; } catch (NoSuchMethodError e) { // ignore } This will not work, since the method will be resolved at compile-time. You really need to use reflection for it. And if you have

问题 What is the recommended way to define private and protected methods in Objective-C? One website suggested using categories in the implementation file for private methods, another suggested trailing underscores, or XX_ where XX is some project-specific code. What does Apple itself use? And what about protected methods? One solution I read was to use categories in separate files, for example CLASS_protected.h and CLASS_protected.m but this seems like it could get very bloated. What should I do?