question about abstract classes

[TheFlying_Boy]

Hi all. happy to be with u here.
I had an error while trying to use abstract classes, here u are the code i wrote:

public  abstract class Animal
{
    private String Name;
    public Animal(String strname)
    {
        Name=strname;
    }
    public  abstract void Speak();

}

Now i will make a subclass Dog :

public class Dog extends Animal
{
   
   public  void Speak()
    {
        System.out.print("Hiii, I'm a dog!");
    }

}

i had the error :
Cannot find symbol
symbol : constructor Animal()
location: class animall.Animal


Waiting for answers......
thanks in advance.

[Fubarable]

Dog's default constructor will try to call Animal's default constructor, but it doesn't exist and hence the error. Solution:
either give Animal a default constructor without a parameter or create a constructor for Dog that call's Animal's current constructor as its super constructor.

[derrikc]

It might be worth adding that Java will provide a default constructor unless you define one, even if the one you define takes an argument.

[TheFlying_Boy]

thanks for ur answers.
I have to add a constructor to class Dog. it should be :

  public Dog(String Nm)
   {
        Animal(Nm); // calls the constructor of the super class.
   }

but it doesn't work, because constructor Animal is not seen in the class Dog. what should i do?:(

[pbrockway2]

Use "super".

Using the Keyword super (The Java™ Tutorials > Learning the Java Language > Interfaces and Inheritance)

[TheFlying_Boy]

thanks, it works now.:)

[pbrockway2]

You're welcome.