Simple Question regarding Abstract class

[jo sim]

Can you have a private variable in an abstract class?
also Can you have a static variable in an abstract class? and why?

[Carl Trusiak]

Yes and Yes

An Abstract class will be part of a final class and as such can do everything a final class can with the exception of being instanciated directly.

[jo sim]

can you instantiate an abstract class indirectly if not directly and if so how?

[Keith Lynn]

You can instantiate a concrete subclass of an abstract class.

[Carl Trusiak]

An abstract class will be instanciated as part of the object creation process of any final class that extends it.

 
public abstract class A{
  private int i = 0;
  public static String hi = "Hello";
 
  public A(){
     System.out.println(hi + " A Contstructor");
  }
 
  public abstract void sayHi();
}
 
public class B extends A{
   
    public B(){
      sayHi();
    }
    
    public void sayHi(){
        System.out.println(hi + " From B method");
    }
}

Give it a spin

[Jan Groth]

@jo

pure curiosity - why don't you try yourself? don't get me wrong, it's good to post questions here, but in order to find out the answer to a "can i ..." question, trying out is perfectly okay.

if it comes to the "why..." part, people will be happy to help...

many greetings,
jan

[jo sim]

Thanks for helping me out I wanted to know if there was a way to instantiate the abstract class but i guess there is no way. I wanted to know what is the meaning of explicit and implicit object casting? I cant seem to find resources on it can you provide me a link?
thanks for your help.