Use move inner to outer level on A in the following class:

package javaapplication9;
public class TestRF2 {
    
    public static final class A {
        public B b = new B();
        public final class B {
            String foo = "foo";
            public int hashCode() {
                return A.this.hashCode() ^ foo.hashCode();
            }
        }
    }
}

Result is this - notice what happened in the hashCode() method.

public final class A {
    public javaapplication9.TestRF2.A.B b = new B();
    public final class B {
        String foo = "foo";
        public int hashCode() {
            return A.this.hashCode()  ??? foo.hashCode();
        }
    }
}