superclass

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Simple null reference bug thats killing me (Java)

Alright so I am messing around with some code in java and I am getting a wierd error. I have my class Chaos which has a Window variable FSW, public as well. Now I have another class called Look. Chaos[详细]

2023-01-30 07:41 分类：问答
How can i initialize superclass params from within the child c-tor in C++?

Watch the following example: 开发者_开发百科 class A { public: A(int param1, int param2, int param3) {[详细]

2023-01-25 05:52 分类：问答
Java extends example

i have a java beginner question: Parent.print() prints \"hallo\" in the console, but also Child.print() prints \"hallo\".[详细]

2023-01-25 00:21 分类：问答
Retrieve Collection of Subclasses Based on Column Value

The title is a bit weird, so let me clarify. I have two objects, Garage and Vehicle, in a one-to-many relationship.There are multiple types of vehicles, such as car and truck; the type is persisted a[详细]

2023-01-24 05:29 分类：问答
General 'map' function for Scala tuples?

I would like to map the elements of a Scala tuple (or triple, ...) using a single function returning type R.The result should be a tuple (or triple, ...) with elements of type R.[详细]

2023-01-21 19:33 分类：问答
why does initializing subclasses require calling the super class's same init function?

I have heard that when you have a subclass, you are supposed to initialize the superclass with the same init function from within the subclass\'s init.What I mean is that the subclass\'s init should c[详细]

2023-01-21 09:37 分类：问答
Custom Linked List - Cannot cast object class to object

For this project I\'m not allowed to use generic classes keep in mind. I have tried copying all my classes into another friends computer and he gets the same error.[详细]

2023-01-21 08:48 分类：问答
warning: incompatible Objective-C types assigning superClass to subClass

Assume a valid super class, and a valid subclass ie the classes work. the following line in a constructor of the subclass[详细]

2023-01-18 08:18 分类：问答
Why aren't superclass __init__ methods automatically invoked?

Why did the Python designers decide that subclasses\' __init__() methods don\'t automatically call the __init__() methods of their superclasses, as in some other languages? Is the Pythonic and recomme[详细]

2023-01-17 04:12 分类：问答
C++ superclass Array yet access subclass methods?

i have an accounts class from that i have 3 types of accounts savings, credit, and homeloan. i created a binary search tree to hold all the accounts as type account[详细]

2023-01-15 06:04 分类：问答