class

How to inherit multiple instances of a class from a single class in python

由 懵懂的女人 提交于 2020-03-23 14:22:08
问题 Disclaimer: I am new to programming and have just started learning about Classes and Inheritance so perhaps it is my lack of understanding which is causing me issues? I have created two classes in seperate files person.py and address.py . The person class inherits from the address class however a person can have multiple addresses (postal, physical etc..) How can I inherit multiple instances of my address class to for each type. My goal is to eventually have a library of common classes for

How to inherit multiple instances of a class from a single class in python

由 旧街凉风 提交于 2020-03-23 14:20:08
问题 Disclaimer: I am new to programming and have just started learning about Classes and Inheritance so perhaps it is my lack of understanding which is causing me issues? I have created two classes in seperate files person.py and address.py . The person class inherits from the address class however a person can have multiple addresses (postal, physical etc..) How can I inherit multiple instances of my address class to for each type. My goal is to eventually have a library of common classes for

C++ list looping

由 感情迁移 提交于 2020-03-22 09:33:07
问题 Im quite stuck here. I have been trying and googling for the past 2 days but I cant figure it out. I have a class that is called Player and another that is called Enemy that inherits from Player. I have a list that stores coordinates for my bullets and loop trough them in Player. Im trying to access and loop trough the same list to check for collision in Enemy that builds on Player, but It will not even enter the loop. I guess somehow its empty but why? struct structShoot { float x; float y;

Spring Aop 代理

由 旧街凉风 提交于 2020-03-20 06:43:33
AOP 面向切面编程 底层就是 动态代理模式 代理模式是java中常用的设计模式。 特点为： 1 委托类和代理类有相同的接口，或共同的父类（保证使用一样的方法） 2 代理类为委托类负责处理消息，并将消息转发给委托类。 3 代理类并不是真正的实现者而是通过调用委托类的方法来实现功能。 代理 分为 静态代理和动态代理。 静态代理： 由程序员或者特定的工具自动生成了源代码，在程序运行之前 .class文件已经存在了。 静态代理实现时：需要一个接口和两个实现类（一个做目标对象，一个为代理对象）。 动态代理：在程序运行期间，通过反射的方法动态的创建出来的！ 动态代理分为 GDK动态代理 和 Cglib动态代理。 GDK动态代理可以实现接口。 Cglib可以实现父类和接口。 静态代理 接口 public interface Subject { public void request(); } 实现类（目标对象） public class RealSubject implements Subject { public void request() { System.out.println("okokok"); } } 实现类（代理对象） public class ProxySubject implements Subject { public ProxySubject() { } private

vue中多个页面共用一个头部，但每个页面标题文字不一样

由 自古美人都是妖i 提交于 2020-03-18 18:06:55
commonHeader.vue <template> <div class="header"> <div class="header-left"> <span @click="$router.go(-1)" class="el-icon-arrow-left"></span> </div> <div class="header-title"> <span class="header-text">{{headTitle}}</span> </div> </div> </template> <script> export default { name: 'commonHeader', data () { return { } }, props: ['headTitle'], } </script> 其他页面 <template> <em-header :headTitle = "pageTitle"></em-header> </template> <script> import EmHeader from "@/components/commonHeader" //引入header export default{ 　　　　data(){ 　　　　　　pageTitle:'绑定', //页面header内容 　　　　}, 　　　　components:{ 　　　　　　EmHeader

how to figure out what class called a method in java?

由 旧街凉风 提交于 2020-03-18 12:02:55
问题 How do I figure out what class called my method without passing any variable to that method? let's say we have something like this: Class A{} Class B{} Class C{ public void method1{} System.out.print("Class A or B called me"); } let's say an instance of Class A calls an instance of class C and the same for class B. When class A calls class C method1 method, I want it to print something like "Class A called me", and when class B called it to print "Class B called me". 回答1: There's no really

Instance Variables in Javascript Classes

由 拈花ヽ惹草 提交于 2020-03-18 11:09:08
问题 I mostly code in PHP and Java, but I will occasionally work on the front end of a project and use JavaScript. I usually create objects differently than below, but I came across this and it caught my interest being that the syntax is similar to what I usually program in. I was poking around, trying to figure out how to use instance variables in JavaScript classes using the syntax below. I've tried declaring the instance variables by name; , or _name; , or var name; , or all of those previous

instantiate class from class object

由 拟墨画扇 提交于 2020-03-18 10:27:30
问题 In java, can I use a class object to dynamically instantiate classes of that type? i.e. I want some function like this. Object foo(Class type) { // return new object of type 'type' } 回答1: In Java 9 and afterward, if there's a declared zero-parameter ("nullary") constructor, you'd use Class.getDeclaredConstructor() to get it, then call newInstance() on it: Object foo(Class type) throws InstantiationException, IllegalAccessException, InvocationTargetException { return type

Can a trivial type class be copied when not all its members are initialized?

由 笑着哭i 提交于 2020-03-18 09:42:31
问题 (I just realized I first need to solve a much more basic issue with copying unions: When a union object is copied, is a member subobject created?. Please see that other question first.) The implicitly generated copy operations (constructor and assignment) of a class perform member by member copy (initialization or assignment). (For a trivial type these are the same.) So a class with some members not initialized cannot be copied, as accessing uninitialized objects is illegal. struct C { int m1
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