Java静态内部类

public class SampleClass {

   static abstract class Test{

      int num = 300;

      public abstract void display();

   }

   class DemoClass extends Test{

      public void display() {

         System.out.println("Hi how are you");

      }

   }

   public static void main(String args[]){

      SampleClass obj = new SampleClass();

      obj.new DemoClass().display();

   }

}