objectinstantiation

How java create objects implicitly? Like in case of String class

由 蹲街弑〆低调 提交于 2019-12-31 00:47:37
问题 I can't understand how an object is created implicitly. Example: String s = "implicit instantiation"; Can I make my own class whose objects can be created implicitly? 回答1: No, String instantiation is handled implicitly by the compiler. Only the String and Array classes have this property. String greeting = "Hello world!"; char[] helloArray = { 'h', 'e', 'l', 'l', 'o', '.' }; Autoboxing allows you to implicitly instantiate objects of primitive wrapper types, but that's also a special case

How to access parent's class property if the current class has been instantiated in the parent

由 穿精又带淫゛_ 提交于 2019-12-25 18:41:04
问题 I'm experimenting with MVC trying to make a simple framework. This is an example of what I'm doing: <?php require_once('config.php'); //Here I have the Config object class App{ protected $config; protected $controller; public function init(){ $this->config = new Config; $this->controller = new Main_Controller; } } class Main_Controller extends App{ public function __construct(){ var_dump($this->config); } } $app = new App; $app->init(); The problem is that my var_dump is returning NULL, so

Filling out Object Properties with default values Recursive

由 泪湿孤枕 提交于 2019-12-24 01:54:26
问题 I want to populate the object's properties with some dummy data. Here is my code but it always returns null. private static object InsertDummyValues(object obj) { if (obj != null) { var properties = obj.GetType().GetProperties(BindingFlags.Instance | BindingFlags.DeclaredOnly | BindingFlags.Public); foreach (var property in properties) { if (property.PropertyType == typeof (String)) { property.SetValue(obj, property.Name.ToString(), null); } else if (property.PropertyType == typeof(Boolean))

Test assert fail: Null reference exception. Object Reference not set to an Instance of an object

由 心不动则不痛 提交于 2019-12-13 00:33:59
问题 Ok so I have one line of code that is causing me grief, but unfortunately without it, my program breaks. It is the only way I can think of (aside from completely restructuring my program) to do what I want it to do. The purpose of this line is to select the next class to run (in the menu), which is outside of its own scope. Trouble is that the class (Login) exists within the scope of the menu. Here is the line: LoginView.Menu.SetMenuView(); Can anyone suggest a better way of writing this?

How to instantiate a service dynamically?

由 你说的曾经没有我的故事 提交于 2019-12-12 09:02:31
问题 I have a Utils Service which is very heavy. I Want to use some of the functions defined in it on a particular user action. As this service is heavy I want to instantiate it lazily(on user action). How do I achieve this? Service module.service('Utils', function (dep1, dep2) { this.method1 = function () { // do something } // other methods }); Controller module.controller('AppCtrl', function ($scope) { // I don't want to inject Utils as a dependency. $scope.processUserAction = function () { //

How to instantiate SKSpriteNode spritekit swift 3

由 瘦欲@ 提交于 2019-12-12 06:59:33
问题 I have a 2 player space shooter game and am having trouble with the shooting part. I currently have a ship that moves it's x position with your finger. I want it to shoot strait up when the user pushes the "fire" button. So here is my question. How can I instantiate my bullet(SKSpriteNode) at the gun tip and shoot upwards when the user pushes the "fire"? 回答1: This is pretty basic but you need to: Create a new sprite for the bullet Position the bullet in the same place as the ship Make the

Create object of parameter type

由 橙三吉。 提交于 2019-12-08 08:51:28
hey. Is it possible to have a method that allows the user to pass in a parameter of a certain type and have the method instantiate a new object of that type? I would like to do something like this: (I don't know if generics is the way to go, but gave it a shot) public void LoadData<T>(T, string id, string value) where T : new() { this.Item.Add(new T() { ID=id, Val = value}); } The above doesn't work, but the idea is that the user passes the object type they want to instantiate and the method will fill in details based on those parameters. I could just pass an Enum parameter and do a Switch and

Create object of parameter type

由 巧了我就是萌 提交于 2019-12-08 03:37:09
问题 hey. Is it possible to have a method that allows the user to pass in a parameter of a certain type and have the method instantiate a new object of that type? I would like to do something like this: (I don't know if generics is the way to go, but gave it a shot) public void LoadData<T>(T, string id, string value) where T : new() { this.Item.Add(new T() { ID=id, Val = value}); } The above doesn't work, but the idea is that the user passes the object type they want to instantiate and the method

Best way to create instance of child object from parent object

由 拟墨画扇 提交于 2019-12-01 02:42:47
I'm creating a child object from a parent object. So the scenario is that I have an object and a child object which adds a distance property for scenarios where I want to search. I've chosen to use inheritance as my UI works equivalently with either a search object or a list of objects not the result of a location search. So in this case inheritance seems a sensible choice. As present I need to generate a new object MyObjectSearch from an instance of MyObject . At present I'm doing this in the constructor manually by setting properties one by one. I could use reflection but this would be slow.

Best way to create instance of child object from parent object

由 北战南征 提交于 2019-11-30 22:27:52
问题 I'm creating a child object from a parent object. So the scenario is that I have an object and a child object which adds a distance property for scenarios where I want to search. I've chosen to use inheritance as my UI works equivalently with either a search object or a list of objects not the result of a location search. So in this case inheritance seems a sensible choice. As present I need to generate a new object MyObjectSearch from an instance of MyObject . At present I'm doing this in
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