Java: static field in abstract class

Question

I just start out with an example, that explains it best:

public abstract class A{
    static String str;
}

public class B extends A{
    public B(){
                


        

Answer 1

Put the static varibale in each subclass and add a (not static) abstract method to the abstract superclass:

abstract String getStr();

Then implement the getStr() method in each subclass by returning the static field of this special subclass.

public class B extends A {
 private static String str;

  @Override
  public String getStr() {
    return B.str;
  }
}