class Child extends Parent {
    private String name;
}
class Parent {
    public int id;
}
class TestChild {
    public static void main(final String[] args) {
        final Child child = new Child();
        //String s = child.name;<--The field Child.name is not visible
        System.out.println("Previous id: " + child.id);
        child.id = 100;//<--We can modify this because it is defined as public in Parent
        System.out.println("Updated id: " + child.id);
    }
}

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