如何在子类方法java中调用超类变量

class SuperClass {
    protected int variable = 10;
}

class SubClass extends SuperClass {
    public void printVariable() {
        System.out.println("SuperClass variable: " + super.variable);
    }
}

public class Main {
    public static void main(String[] args) {
        SubClass sub = new SubClass();
        sub.printVariable();
    }
}

SuperClass variable: 10