[inheritance] Forum Topics

Good evening ladies and gentlemen. i have a serious problem. Despite my best efforts to follow the principles of object orienting design, i noticed that my child classes are not getting any variables derived from their respective parent class stored with their values from user input to be used in …

I was working on the wrong assignment, so I hammered this out, it's almost due, and I am having trouble figuring out how to test my program. Eclipse keeps showing errors when trying to figure out how to populate my fields, assuming I have the rest of the program right. …

Hi, I have three classes `public class Player` , `public class Computer : Player`, and `public class Game`. In `Game` I have a List: `public List<Player> PlayerList` and a variable `Player CurrentPlayer`. Heres what happens: when I create a `new Computer()` I add it to the `PlayerList`, the `CurrentPlayer` acts …

what is correct solution in Inheritance ???? I am new to genetics in Java and I want to resolve this question I look at the question existing attachments please and what is the correct dissolved and thank you very much

how many classes are allowed to inherit from a base class?

In the derived class when calling up a variable that was initialised in the base class, is there a need to say base.(variableName) or can it simply be left out

class A { public: protected: int i; }; class B : public A { friend void f(A*, B*); void g(A*); }; void f(A* pa, B* pb) { // pa->i = 1; pb->i = 2; // int A::* point_i = &A::i; int A::* point_i2 = &B::i; } void B::g(A* pa) { …

the following is taken from joshua bloch's effective java. pg 82: public class InstrumentedHashSet<E> extends HashSet<E> { // The number of attempted element insertions private int addCount = 0; public InstrumentedHashSet() { } public InstrumentedHashSet(int initCap, float loadFactor) { super(initCap, loadFactor); } @Override public boolean add(E e) { addCount++; return …

Hello people. I need an explanation about inheritance I got a little confused in class: This is the modelling problem: There are two objects: doctors and patients. They are expected to have only the following attributes: Doctors have: name, age, id, and salary Patients have: name, age, id, and disease …

I have two settings classes one abstract base class from which the second settings class derives public abstract class BaseFooSettings { public int a; public int b; public float c; } public class DerivedBarSettings : BaseFooSettings { public float d; } I then have two classes one base class and …

Hi for all and many thanks for attention, for now i'm studing the "inheritance" of a class. I have one class "Form1" and another class it have the inherit of the first "Form2:Form1" until this point all is ok, but i not need of all of Form1 members but only …

Hello Everyone, everything has been going good with the whole JAVA learning process until today. I have been working on Inheritance and have not been able to complete this project. My problem is coming from the test class, I simply do not know how to set it up to output …

I hope someone can help me.. I'm taking a course in programming with java and I have an assignment which is just killing me. I've been visiting the Blackboard page for the class and looking at other questions asked for help from other students in the class having similar issues, …

Hey, following Problem: I have two classes Measurement and its subclass DC_Measurement. Measurement has a method called: [CODE]public virtual SetPoint[,] createSetPointArray()[/CODE] DC_Measurement: [CODE]public override DCSetPoint[,] createSetPointArray()[/CODE] DCSetPoint is also a subclass of SetPoint. I read that this is possible. Now I use in my mainWindow following code which contains an …

[CODE]using System; using System.Collections.Generic; using System.Text; class BaseClass { public virtual void method() { Console.WriteLine("BaseClass method"); } } class SubClass : BaseClass { public override void method() { Console.WriteLine("SubClass method"); } public void someMethod() { Console.WriteLine(); } static void Main(string[] args) { BaseClass var = new SubClass(); var.method(); var.someMethod(); } …

Can someone please explain to me why I am getting errors with this? [CODE] /** This class stores data about a room. */ public class Room { private int walls; // Number of walls private int windows; // Number of windows private String ceiling; // Type of ceiling private String …

So my goal is to use inheritance and as you can see I inherited Point Example which has x, y as variables. Well for some odd reason my Length seems to be in correct and I'm not sure where I went wrong. Any guidance will be very much appreciated. Just …

Write a Java program to demonstrate the use of inheritance, polymorphism, interfaces and transaction processing. This program will also use the Vector class. Class Definitions: You are to begin with the following class (Account.java): *bottom of post* [CODE] public class Account implements AccountAction { protected String accountNo, institution, name; protected …

Okey I am making a simple chess program as an assignment and I ran into a few problems I coded a file called ChessPiece which is the Base class of all the chess Piece eg King ,Queen and etc... We have to create a interface class call ChessPaint that draw …

What happens if you inherit multiple interfaces and they have conflicting method names? [CODE]using System; namespace WindowsApplication1 { public interface a { void b(); } public interface c { void b(); } public class Class1:a,c { public Class1() { // // TODO: Add constructor logic here // } #region a …

Alright. So with c# we have SINGULAR class inheritance, correct? But we can have infinite Interfaces. I don't get this because when I inheret like so (I'm doing this right, Right?) [CODE] class Player : Zombie_Game.Variables { } [/CODE] and in my Variables class I have this... [CODE] class Variables …

These days ,I am learning inheritance and dynamic binding. I could figure out what the code means. However, I can't see much point in setting such base classes So,I want to know why should we set up base classes and derived classes

Hi everyone...I have this [CODE] abstract class Program { static void Main(string[] args) { } public abstract void m1(); } class Program2 : Program { public override void m1() { } } [/CODE] I inherit Program and implement the method m1(), can anyone explain in a simple way why I …

Our teacher gave us an assignment.Can anyone help or give me some idea on how to solve this java problem? im still learning java. Here's the problem: "Write some code to demonstrate to yourself the chain of construction. Create an inheritance hierarchy of 4 classes. Give them any names you …

hi everyone! )) As I understand it - to a class B inherit fields and methods of class A must describe them in this order - public class A [ICODE]{ public method34() { int m = 34; } public class B { private int my_m; public method1() { int m …

Hello! (Spelled polymorphism wrong in title, I know... it's late!) Now, I understand the concepts of both just fine, but implementing them is where I really run into trouble; this is especially when I'm given a specific problem to solve by using them (i.e. my current assignment). Okay so here's …

In an assignment, I have to use four different files in a single program. I know doing so has something to do with inheritance (which we're studying now), but I don't understand how to write each file to use the others. How do I use multiple files in this single …

I am good at created a little block diagram; however, I struggle with tracing these out and I have a midterm in a few hours. I am confused about all the casting and also about #4 and #7. I thought #4 would be a compiler error because the "Decared Type" …

hello friends i m larning core java.i want some write code of some program by in which i can use the concept of opertors,inhertance so plz me assignment so that i can do practic.

I'm working on a basic "banking" program. The most recent change I've made to it is to use inheritance so that instead of just an Account, you can make either a checking or savings account specifically. Everything is working fine, except that the checking account is supposed to have a …

Here is what i currently have; the instructions are a bit vague so i am confused on what to do beyond this...any help will be tremendous! This is my 2nd week in java so please understand i am not an expert [CODE]public abstract class TestQuestion { protected String question; protected …

I'm getting this error: [CODE]error: no matching function for call to 'cp::cpImageButton::SetMouseClickCallback(TitleScreen* const, void (TitleScreen::*)())'| note: candidates are: void cp::cpImageButton::SetMouseClickCallback(DisplayObjectContainer*, void (DisplayObjectContainer::*)())|[/CODE] However, TitleScreen inherits from DisplayObjectContainer, so I'm unsure why this isn't working. I haven't really worked with inheritance in C++ much, so a push in the right direction …

I'm currently learning java, and im having a problem understanding what's going on when we use a constructor when inheriting from a class that already has a constructor. The best would be to just throw in my example. I have 2 classes, "Person" and "Employee". "Employee" is inheriting from "Person", …

Hello I have 2 classes [B]clsParty[/B] and [B]clsAccount[/B] clsParty has a function named [B]GetParty()[/B] clsAccount has a function named [B]GetAccount()[/B] I have a 3rd class named [B]clsDoTran[/B] What i want to do is i want to use [B]GetParty()[/B] and [B]GetAccount()[/B] functions from both clsParty and clsAccount But there is a …

I would like to automatically call a base class method for a class that inherits from the base class. From the extent of my limited knowledge, I know I can do this using base.Method(). [CODE] public abstract class Foo { private int a; private float b; public virtual void Init() …

[code] public class A { String username = "Unknown"; public A() { username = "Virux"; B.method(); } } public class B extends A { public void method() { System.out.println(super.username); } } [/code] Obviously my actual code is much more complex than this. But how can I get B to see …

I came across a design in which there are different projects for the methods and data. [B]Example 1[/B] What I meant is normally, if we have a USER class then [code] class user { int userid; string username; //methods public void Adduser(int id, string Name) { } public void RemoveUSer(int …

I have a parent class which 2 other classes inherit from. All of the instance variables are inherited from the parent class, and I want to write one method which can accept either of the subclasses as a parameter (without overloading the method if possible). public class Project { static …

Hey everybody, I was wondering if somebody could help me. I'm having trouble with this assignment, tried to email my teacher a few days ago and he has not returned my email, it's for an online class. The whole chapter is talking about abstract classes and Inheritance and it's very …

Hey lads, I have a small problem re inheritance. The 1st piece of code is the superclass which contains hour and minute. The 2nd piece of code which is the subclass, contains the int second. The 2nd piece inherits the code from the 1st piece. Now when seconds go over …

hi this is the corotuıne example writen in def [CODE]namelst=['Charles Darwin (1809-82)', "Darwin's principal works, The Origin of Species (1859)", 'and The Descent of Man (1871) marked a new epoch in our', 'understanding of our world and ourselves. His ideas', "were shaped by the Beagle's voyage around the world in", …

could anyone help me i have been trying to do this for a good 2 hours now and still can't get it to work :( i have created this class diagram for the server side of my project and i can't get the inheritance right i need to be able …

Hi , may i know why i keep on getting this error? i tried to inherit an interface. I already implement all the member in that base interface but still i get this error. Error 1 does not implement interface member cannot implement an interface member because it is not …

This is new for me so I'm not really sure how to do this... I'm trying to create a base class that I can inherit from but there are some fields that I need to ensure each inheriting class specifies a value for. How do I do that?

hi everyone, i need help with a project that i am doing. i need to use inheritance and arrays to make a poker game, making a card class and a poker class that extends the card class in the card class i would need to use arrays to make a …

Hi, I am learning inheritance and abstract base classes. I need to define an abstract base class (ABC) that provides interfaces, and a derived class (directly from the ABC) that provides the implementation. The derived class may need additional member functions and variables (both, public and private). Using a pointer …

I am write a program that both uses inheritance and composition. I am a bit new to inheritance so I am a little confused on some aspects of it. Let's say I have a class definition like this [CODE]class Month { Week *week[4]; }; // class Month class Week { …

Hello. This is my first post! I'm having some difficulty with this code. I have a light-bulb which is attached to a powerplug. When the mouse clicks the power plug, the light-bulb turns on, and turns off when clicked again using mouse events. Now I want to create more light-bulbs, …

Hi all, I have two classes [B]C[/B] and [B]D[/B] these classes are inherited from [B]B[/B] class. My question is how can I use a member function of [B]C[/B] at[B] D[/B] and at [B]D[/B]'s child classes? I tried to do it with a regular function but it does not work in …

Hi I am a little confused about interfaces. Can an abstract class inherit an interface, so that interface can be used in conjunction of a class derived from the adstract? eg A is an interface, B is an abstarcat class, C & D inherit from B but have different proerties. …