NestedThings.java

class XXX {
    String f() {
        new Runnable() {
            public void run() {
                new Runnable() {
                    public void run() {
                        new Runnable() {
                            public void run() {
                                new Runnable() {
                                    public void run() {
                                        new Runnable() {
                                            public void run() {
                                                String s = (String)"";
                                            }
                                        };
                                    }
                                };
                            }
                        };
                    }
                };
            }
        };
        return "";
    }
}