在Java中，未命名类可以访问其外部类的成员，但是在不同的子类之间，未命名类的访问规则类似于其他成员一样。具体来说，未命名类只能访问其所在的子类中的成员，而无法访问其他子类的成员。

以下是一个示例代码，说明如何在不同的子类之间使用未命名类的访问规则：

public abstract class Parent {
    private int parentVar = 0;

    public void accessVars() {
        // Accessing parentVar from an unnamed class in the same subclass
        Object anonClass = new Object() {
            public void accessParentVar() {
                System.out.println("accessing parentVar: " + parentVar);
            }
        };
        ((Object) anonClass).accessParentVar(); // must cast to Object to call the method
    }

    // abstract method that will be implemented by both child classes
    public abstract void childAccessVars();
}

public class ChildOne extends Parent {
    private int childOneVar = 1;

    @Override
    public void childAccessVars() {
        // Accessing childOneVar from an unnamed class in this subclass
        Object anonClass = new Object() {
            public void accessChildOneVar() {
                System.out.println("accessing childOneVar: " + childOneVar);
            }
        };
        ((Object) anonClass).accessChildOneVar();
    }
}

public class ChildTwo extends Parent {
    private int childTwoVar = 2;

    @Override
    public void childAccessVars() {
        // Accessing childTwoVar from an unnamed class in this subclass
        Object anonClass = new Object() {
            public void accessChildTwoVar() {
                System.out.println("accessing childTwoVar: " + childTwoVar);
            }
        };
        ((Object) anonClass).accessChildTwoVar();
    }
}

public class Main {
    public static void main(String[] args) {
        Parent child1 = new ChildOne();
        Parent child2 = new ChildTwo();

        child1.accessVars();