覆盖从子类定义的静态变量是否会影响父类中所述变量的值？

Question

I come to you with a simple OOP question. Let's say there are three classes - A, B and C. B and C both inherit a static variable from A. Let's also say that A defines the value of this variable as being 0. Let's say that both B and C modify the value of this static variable. My question is this - since static variables remain constant across members of the same class, does this mean that setting the value of a variable of a superclass from a subclass will have no effect on the value of the super class?

In other words, if we change the value of B's variable to 1, that value will only be 1 for objects of class B and not C or A?

Answer 1

静态字段仅属于一个类，其子类不继承

Answer 2

Here you can find simple java implementation for your problem.
The results can interpret solution.

 class A {
   static int variable = 0;
}

class B extends A{

}
 class C extends A{

}

public class Runclass {

    public static void main(String arg[]){
        A a = new A();
        System.out.println("A "+a.variable);

        B b = new B();
        System.out.println("B "+b.variable);

        C c = new C();
        System.out.println("C "+c.variable);

        b.variable=1;
        System.out.println("After modifying B "+b.variable);
        System.out.println(" A "+a.variable);

    }
}

Output:

A 0
B 0
C 0
After modifying B 1
A 1

Answer 3

static doesn't mean constant. final means that you can't change the value.
You can reach the variable in the superclass A and change it, using this code for example in B: A.someVariable=1;
After this, you will see the value 1 from C, B and A too, if you use the superclass A variable (A.someVariable).
I give you a code example:

package teszt;

class A {
    static int statValami=0;
}

package teszt;

class B extends A{
    void writeOut(){
        A.statValami=1;
        System.out.println(statValami);
    }
}

package teszt;

class C extends A {
    void writeOut(){
        A.statValami=100;
        System.out.println(statValami);
    }
}

package teszt;

class Over  {
    public static void main(String args[]){
        new B().writeOut();
        new C().writeOut();
        System.out.println(A.statValami);
    }
}

OUTPUT is:
1
100
100