怎么实例化Class2啊

Question

namespace ConsoleApplication1
{
    class Class1
    {
        public void showA()
        {
            Console.WriteLine("A");
        }        public class Class2 
        {
            public void showB()
            {
                Console.WriteLine("B");
            }
        }
    }
}

Answer 1

Class1.Class2 cl = new Class1.Class2();
c1.showB();

Answer 2

java？java也不是这样输出的，你究竟想哪样？
class Class1{
            public void showA(){
               System.out.println("A");
            }
            class Class2 {
                public void showB(){
                System.out.println("B");
              }
            }   
        }
        public static void main(String[] args) {
             //第一种写法
             Class1 c1 = new Class1();
             Class1.Class2 c2 = c1.new Class2();
             c2.showB();
             //第二种写法
             //Class1.Class2 c  = new Class1().new Class2();
             //c.showB();
        }
     }

Answer 3

C#实现了，我想知道 java怎么实现Class2的实例化