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

This will print the output you want:

public abstract class A{
}

public class B extends A{
    static String str;

    public B(){
        str = "123";
    }
}

public class C extends A{
    static String str;

    public C(){
        str = "abc";
    }
}

public class Main{

    public static void main(String[] args){
        A a = new B();
        A c = new C();
        System.out.println("B.str = " + B.str);
        System.out.println("C.str = " + C.str);
    }
}