没在类中定义匿名内部类为什么编译出现**$1.class文件

interface ABase {

}



interface BBase {

}



interface CBase {}



class NestedClass {



    private static class A implements ABase {

        

    }

    

    public static class B implements BBase {

        

        public static class C implements CBase {

        }

    }

    

    

    public static ABase getA() {

        return new A();

    }

    

    public static BBase getB() {

        return new B();

    }

    

    

    

    public static void main(String[] args) {

        ABase aBase = getA();

        BBase bBase = getB();

        

        NestedClass.A a = new NestedClass.A();

    }

    



}