如何访问子类的变量？

class Parent {
    private int privateVariable;

    public int getPrivateVariable() {
        return privateVariable;
    }

    public void setPrivateVariable(int value) {
        privateVariable = value;
    }
}

class Child extends Parent {
    public void accessParentVariable() {
        int value = getPrivateVariable();
        System.out.println("Parent's private variable value: " + value);
    }
}

public class Main {
    public static void main(String[] args) {
        Child child = new Child();
        child.setPrivateVariable(10);
        child.accessParentVariable();
    }
}