两个具体类之间的抽象类 - java

Question

So essentially, I have sandwhiched an abstract class between two concreate classes and would like the bottom-class of this sandwich to be able to call all the name of the two parent classes. This doesn't work, I would like to know why? Not the code, I wrote that without the computer just the logic.

The output I expect after calling get name would be: customer!middleMan!myShop!

public abstract class StoreClerk extends Shop { 
    string name =  "MiddleMan!";

    public getName {
        return this.name + super.getName();
    }

}

public class Shop {
    string name = "myShop!";

    public getName() {
        return this.name;
    }
}

public class Customer extends StoreClerk {
    string name = "customer!";

    public getName() {
        return this.name + super.getName();
    }
}

public class void main(String args[]) {   
    Customer ibrahim = new Customer();
    ibrahim.getName();
}

Answer 1

Working Code:

abstract class StoreClerk extends Shop {
    String name = "MiddleMan!";

    public String getName() {
        return this.name + super.getName();
    }

}

class Shop {
    String name = "myShop!";

    public String getName() {
        return this.name;
    }
}

class Customer extends StoreClerk {
    String name = "customer!";

    public String getName() {
        return this.name + super.getName();
    }
}

public class Store {
    public static void main(String args[]) {
        Customer ibrahim = new Customer();
        System.out.println(ibrahim.getName());
    }
}

Your Mistake: Although there were many but few that are imp are

• you were using return in your getName() but you were not defining the function to return anything.

  Like :

 public String getName() { return this.name + super.getName(); }

• You were not displaying any outcome of the code.

  Like :

System.out.println(ibrahim.getName());