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polymorphism relates inheritance


polymorphism relates inheritance

By : user3853932
Date : October 28 2020, 04:55 PM
it fixes the issue Polymorphism is not inherently dependent on inheritance.
Polymorphism is a rather abstract concept about giving uniformous interfaces to different kinds of values.
code :


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Inheritance and polymorphism

Inheritance and polymorphism


By : user3712589
Date : March 29 2020, 07:55 AM
hop of those help? First and foremost you should pick up a good C++ book and read the concepts:
The Definitive C++ book and guide list
code :
class circle: shape 
class circle: private shape 
class circle: public shape 
JPA Inheritance and EJB polymorphism

JPA Inheritance and EJB polymorphism


By : Jeanyvie Reponte
Date : March 29 2020, 07:55 AM
Does that help This is an EJB Polymorfism, and can be applied to other situations. It doesn't relate to JPA inheritance directly.
The trick is to use @Local interface for EJBs:
code :
@Local
public interface MyClassFacadeInterface {    
    public void doSomething(MyClass c);
}
public void doSomething() {      
    for (MyClass c : myClassFacade.findAll()) {      
        String lookupName = getNameFromClassName(c.getClass().name());
        MyClassFacadeInterface myInt =  (MyClassFacadeInterface) new InitialContex().lookup(lookupName);
        myInt.doSomething(c);
    }      
}      
Polymorphism, Inheritance

Polymorphism, Inheritance


By : Angel LB
Date : March 29 2020, 07:55 AM
Any of those help You're putting methods inside of methods and in fact you've got your main method enclosing all of the code of your Bicycle class -- don't do this. Your main method should be its own separate method, should not hold other methods, should create a Bicycle instance. call methods on this instance and that's about it.
code :
public class Bicycle {
        public int cadence;
        public int gear;
        public int speed;

    public Bicycle(int startCadence, int startSpeed, int startGear) {
        gear = startGear;
        cadence = startCadence;
        speed = startSpeed;
    }


    public void setCadence(int newValue) {
        cadence = newValue;
    }

    public void setGear(int newValue) {
        gear = newValue;
    }

    public void applyBrake(int decrement) {
        speed -= decrement;
    }

    public void speedUp(int increment) {
        speed += increment;
    }

    public void printDescription() {
    System.out.println("\nBike is " + "in gear " + this.gear
        + " with a cadence of " + this.cadence +
        " and travelling at a speed of " + this.speed + ". ");
    }

    public static void main(String[] args) {
      Bicycle bicycle = new Bicycle(20, 10, 2);
      System.out.println(bicycle);
      // ... etc
    }
}
Inheritance and polymorphism in C++

Inheritance and polymorphism in C++


By : Saurabh Purohit
Date : March 29 2020, 07:55 AM
it fixes the issue C++ is usually very strict on this type of inheritance, if you'd like a work around you could use this to solve issues like this d1.f(); :
code :
static_cast<Base*>(&d1)->f("string");
class Base
{
public:
  //...
    virtual void f(int i) { printf("Base::f(int)"); }
};
Polymorphism and inheritance

Polymorphism and inheritance


By : user4567009
Date : March 29 2020, 07:55 AM
around this issue You have a misunderstanding of what you should be doing in inheritance. extends is a reserved word that was wisely chosen. The point of B extending A is to say that B is a subset of A with additional attributes. You're not supposed to redefine x in B; A should be handling x. By redefining x in a subclass, you're hiding the superclass' field x (this is true even if x refers to different variable types).
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