一个 java 静态内部类的问题,求解

interface TestInterface

{

  void test();

}



class OutterClass

{

  class CommInnerClass implements TestInterface  //普通内部类

  {

    public void test()

    {

      System.out.println("This is Common Inner Class.");

    }

  }

  

  static class StaticInnerClass implements TestInterface //静态内部类

  {

    public void test()

    {

      System.out.println("This is Static Inner Class.");

    }

  }

}

public class TestInnerClass

{

  public static void main(String[] args)

  {

    OutterClass oc = new OutterClass(); //一个外部类对象

    OutterClass.CommInnerClass commInnerClass = oc.new CommInnerClass();

    //创建普通内部类,必须要要有一个外部类的对象,然后用外部类对象.new的形式创建内部类对象

    OutterClass.StaticInnerClass staticInnerClass = new OutterClass.StaticInnerClass();

    //而创建静态内部类,必须用new OutterClass.StaticInnerClass(); 这种方式

    //staticInnerClass = new oc.StaticInnerClass(); //用这种方式反而不行,为什么不行?

  }

}