instance

问题 What's the difference between these 2 piece of codes? <?php $object1 = new User(); //^^ $object1->name = "Hello"; echo $object1->name; class User {} ?> And: <?php $object1 = new User; //^ $object1->name = "Hello"; echo $object1->name; class User {} ?> I get the same output: Hello So is there any difference if I use the parentheses or not in: $object1=new User; 回答1: The are exactly the same, you can compare opcode of these 2 scripts: 1 script: $object1=new User(); $object1->name="Hello"; echo

问题 Hey I'm having some trouble managing multiple instances of the same class in a java program. I've creating a few instances of a java class that contains a few methods that add/subtract from an integer in the class, but what's happening is that the adding and subtracting is being done on all of the instances (see code below), any tips on managing these instances is most appreciated. Integerclass num1 = new Integerclass(); Integerclass num2 = new Integerclass(); Integerclass num3 = new

问题 Hey I'm having some trouble managing multiple instances of the same class in a java program. I've creating a few instances of a java class that contains a few methods that add/subtract from an integer in the class, but what's happening is that the adding and subtracting is being done on all of the instances (see code below), any tips on managing these instances is most appreciated. Integerclass num1 = new Integerclass(); Integerclass num2 = new Integerclass(); Integerclass num3 = new

问题 I am working on an assignment where I create "instances" of cities using rows in a .csv, then use these instances in methods to calculate distance and population change. Creating the instances works fine (using steps 1-4 below), until I try to call printDistance: ##Step 1. Open and read CityPop.csv with open('CityPop.csv', 'r', newline='') as f: try: reader = csv.DictReader(f) ##Step 2. Create "City" class class City: ##Step 3. Use _init method to assign attribute values def __init__(self,

问题 #include "2d/Vector2D.h" #include <list> #include "../../AbstTS.h" class AbstRB; class fTS: public AbstTS { public: fTS(AbstRB* owner); void Update(); void closestBotStrategy(); }; class fGCBS { public: fGCBS(AbstRaven_Bot* owner); void pickTarget(); }; #endif Above is my code, I want to get access to the pickTarget() from fGCBS class within the fTS class. I know I have to create an instance of this fGCBS but I dont know how to do this, any help is appreciated Thanking You 回答1: To create an

问题 #include "2d/Vector2D.h" #include <list> #include "../../AbstTS.h" class AbstRB; class fTS: public AbstTS { public: fTS(AbstRB* owner); void Update(); void closestBotStrategy(); }; class fGCBS { public: fGCBS(AbstRaven_Bot* owner); void pickTarget(); }; #endif Above is my code, I want to get access to the pickTarget() from fGCBS class within the fTS class. I know I have to create an instance of this fGCBS but I dont know how to do this, any help is appreciated Thanking You 回答1: To create an

问题 I have been searching around the internet about Creating an instance of a object in one class and using that same instance in a different class. I have not found any posts though that apply to what I want to do. Here is an example of what I want to do. public class ThisClass{ public ThisClass{ //This is the object I want to create } } public class FirstClass{ public ThisClass thisclass = new ThisClass(); } public class SecondClass{ //Now in SecondClass I want to be able to access the instance

问题 This question already has answers here : What is a NullReferenceException, and how do I fix it? (29 answers) Closed 3 years ago . I'm using the newest version of unity and I have a class with property public AllStats BaseStats { get; set; } , where the class AllStats is implemented like this: public class AllStats : IEnumerable<Stats> { private MagicPower magicPower; public MagicPower MagicPower { get { return magicPower; } set { magicPower = value; Add("Magic Power", magicPower); } } private

问题 I have this class called Main. java. In this the output is shown by inputLine which is a string taken serially from the com port. i want this string value to be used in some other class which is in the same default package. How do i call this string in other class. How do i create an instance of this class and call the string inputLine in any other xyz.java class. An example would be very helpful. import java.io.BufferedReader; import java.io.InputStreamReader; import java.io.OutputStream;

问题 I am having issues with my below class. I keep getting the below traceback, butI am not sure were I am going wrong. I am expecting to see a dictionary with photo tags. Any help would be great. Traceback: File "project.py", line 231, in <module> new_photo = Photo(result_get_photo_data) File "project.py", line 228, in __init__ for diction in photo_diction["photo"]["tags"]["tag"]: TypeError: list indices must be integers, not st My Code: class Photo(object): def __init__(self,photo_diction):