Let’s say I have three classes: class A { A() { // super(); System.out.println(“class A”); } } class B extends A { B() { // super(); System.out.println(“class B”); } } class C extends B { public static void main(String args[]) { C c = new C(); //Parent constructor will get called } } When I … Read more
I am trying to find a simple and fast way of counting the number of Objects in a list that match a criteria. e.g. class Person: def __init__(self, Name, Age, Gender): self.Name = Name self.Age = Age self.Gender = Gender # List of People PeopleList = [Person(“Joan”, 15, “F”), Person(“Henry”, 18, “M”), Person(“Marg”, 21, “F”)] … Read more
How do I fill an ArrayList with objects, with each object inside being different? Answer ArrayList<Matrices> list = new ArrayList<Matrices>(); list.add( new Matrices(1,1,10) ); list.add( new Matrices(1,2,20) ); AttributionSource : Link , Question Author : Samuel , Answer Author : Aaron Saunders
I have a Rdata file containing various objects: New.Rdata |_ Object 1 (e.g. data.frame) |_ Object 2 (e.g. matrix) |_… |_ Object n Of course I can load the data frame with load(‘New.Rdata’), however, is there a smart way to load only one specific object out of this file and discard the others? Answer .RData … Read more
The ‘height’ and ‘width’ are not supported in HTML5. How can I set a td’s width and height while conforming to the HTML5 standard? <!DOCTYPE html> <html> <head> <meta http-equiv=”Content-Type” content=”text/html; charset=UTF-8″ /> <title>219 班網</title> </head> <body bgcolor=”silver”> <div align=”center”> <table> <tr> <td width=”1000″ height=”250″> <object width=”100%” height=”100%” data=”frameTop.html”></object> </td> </tr> </table> <table> <tr> <td … Read more
I did some searching found some different methods and posts about creating a deep copy operator. Is there a quick and easy (built-in) way to deep copy objects in Ruby? The fields are not arrays or hashes. Working in Ruby 1.9.2. Answer Deep copy isn’t built into vanilla Ruby, but you can hack it by … Read more
I can check all available methods for an object like so: $methods = get_class_methods($object); But how can I see which arguments have to be sent to these methods? Is there a function for this? Answer You can use reflection… $r = new ReflectionMethod($className, $methodName); $params = $r->getParameters(); foreach ($params as $param) { //$param is an … Read more
I’m using PHP. I have an array of objects, and would like to add an object to the end of it. $myArray[] = null; //adds an element $myArray[count($myArray) – 1]->name = “my name”; //modifies the element I just added The above is functional, but is there a cleaner and more-readable way to write that? Maybe … Read more
In C++, I want to define an object as a member of a class like this: Object myObject; However doing this will try to call it’s parameterless constructor, which doesn’t exist. However I need the constructor to be called after the containing class has done some initialising. Something like this. class Program { public: Object … Read more
This question already has answers here: Difference between JSONObject and JSONArray (8 answers) Closed 5 years ago. What are the difference and advantages of using JSON arrays: { thing:[ { }, { } ] } versus JSON objects: { thing:{ { }, { } } } Answer The difference between an array and an object … Read more
