object

问题 Where does the identifiers or variable name gets stored in java? I understand that objects get stored in heap and variable gets store in heap or stack depending on the type and scope of variable. Can we debug or write any program to confirm it? Thanks & Regards 回答1: Names of fields are stored as part of the class metadata, in formerly-PermGen now-Metaspace. Array elements don't have names, only numbers. (Cue Patrick McGoohan.) Names of method and constructor parameters and local variables and

问题 In C++ do you always have initialize a pointer to an object with the new keyword? Or can you just have this too: MyClass *myclass; myclass->DoSomething(); I thought this was a pointer allocated on the stack instead of the heap, but since objects are normally heap allocated, I think my theory is probably faulty?? Please advice. 回答1: No, you can have pointers to stack allocated objects: MyClass *myclass; MyClass c; myclass = & c; myclass->DoSomething(); This is of course common when using

问题 In C++ do you always have initialize a pointer to an object with the new keyword? Or can you just have this too: MyClass *myclass; myclass->DoSomething(); I thought this was a pointer allocated on the stack instead of the heap, but since objects are normally heap allocated, I think my theory is probably faulty?? Please advice. 回答1: No, you can have pointers to stack allocated objects: MyClass *myclass; MyClass c; myclass = & c; myclass->DoSomething(); This is of course common when using

问题 Why are Python integers implemented as objects? The article Why Python is Slow: Looking Under the Hood as well as its comments contain useful information about the Python memory model and its ramifications, in particular wrt to performance. But this article does not ask or answer the question why the decision to implement integers as objects was made in the first place. In particular, referring to Python as dynamically typed is not an answer. It is possible to implement integers as integers

问题 Why are Python integers implemented as objects? The article Why Python is Slow: Looking Under the Hood as well as its comments contain useful information about the Python memory model and its ramifications, in particular wrt to performance. But this article does not ask or answer the question why the decision to implement integers as objects was made in the first place. In particular, referring to Python as dynamically typed is not an answer. It is possible to implement integers as integers

问题 I have an object with objects, which are basically settings per guild. In these objects are various configuration options that the admin of their guild can change. { "1": { "foo": "Hello World", "bar": "Ello World", "roo": { "doo": "oof" } }, "2": { "foo": "foo bar foo bar", "bar": "World! Hi!", "roo": { "doo": "boo!" } } } And I have a default object for those settings. const Default = { foo: "Hello, World!", bar: "Foo example", roo: { doo: "boo" } }; When I add a new key to the default

问题 My objective is to create a map. It have reqid , name and lowest status number of a set as a key. Here set refers to rows belonging to a specific Reqid . The value of the map is an Arraylist which consists of all rows as objects of a specific id . public class MapKey { private Integer id; private String name; private Integer status; public MapKey(Integer id, String name,Integer status) { this.id = id; this.name = name; this.status=status; } @Override toString,hashCode,equals public class

问题 My objective is to create a map. It have reqid , name and lowest status number of a set as a key. Here set refers to rows belonging to a specific Reqid . The value of the map is an Arraylist which consists of all rows as objects of a specific id . public class MapKey { private Integer id; private String name; private Integer status; public MapKey(Integer id, String name,Integer status) { this.id = id; this.name = name; this.status=status; } @Override toString,hashCode,equals public class

问题 My Kivy App Description: I have 3 types of widgets in MyFirstScreen : A RecycleView that has multiple "User"s as its items. (each item is a dictionary ) Three TextInput s that are related to values of each recycle view item. (if you select any items of RecycleView these TextInput s will loaded with corresponding dictionary values) An "Add New User" Button . (if you enter NEW values in TextInputs s and press this button, RecycleView will be updated with: previous items + your new item) Issue:

问题 I have an array of objects let people = [{ Name: 'Bob', Age: '45', }, { Name: 'Jim', Age: '45', } ]; let person = people.filter(person => person.Name=== 'Bob') This returns Bob but how do I delete him? This only seems to delete a property https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/delete so it seems I need an index or maybe there is a better ES6 way? 回答1: You can use splice and findIndex methods and remove specific object from an array. let people = [{"Name":