如何将一个类添加到另一个类的ArrayList中？

Question

I've created a program includes a super class called "Appliance" , from this I have sub classes such as "ElectricCooker" . I need to know create an ArrayList that stores all of these Appliances in another class. I'm a little confused on how to accomplish this. This is what I have done so far:

   ArrayList<Appliance> applianceList = new ArrayList<>();
    ElectricShower a = new ElectricShower(0,0,0,0);

    public void addAppliance()
    {
         applianceList.add(a);

    }

Is this the correct way to implement this? Any help is appreciated, thanks.

Answer 1

You might be needing to review the concepts of Inheritance and Polymorphism . This should accomplish what you want in Java:

public class Appliance {
    // Appliance definition goes in here
}

public class ElectricShower extends Appliance {
    // ElectricShower definition goes in here
}

public class AnotherClass {
    ArrayList<Appliance> appliances = new ArrayList<Appliance>();
    public void addAppliance(Appliance appliance) {
        this.appliances.add(appliance);
    }
}

Example usage:

AnotherClass another = new AnotherClass();
ElectricShower shower = new ElectricShower();
another.addAppliance(shower);