public class Test {

    public static void main(String[] args) {
        Outer.Static.method();
        Outer instance = new Outer();
        instance.field.method();

    }

}

class Outer {

    static class Static {

        static void method() {
            System.out.println("In static class");
        }
    }

    NonStatic field = new NonStatic();

    class NonStatic {

        void method() {
            System.out.println("In non-static class");
        }
    }

}