content: /*
   * Copyright 1999-2012 Alibaba Group.
   *  
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *  
   *      http://www.apache.org/licenses/LICENSE-2.0
   *  
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  /**
   * (created at 2011-6-2)
   */
  package com.alibaba.cobar.parser.codegen;
  
  /**
   * @author <a href="mailto:shuo.qius@alibaba-inc.com">QIU Shuo</a>
   */
  public class Solo {
  
      /**
       * @param args
       */
      public static void main(String[] args) {
          I i = new I();
          A b = new B();
          // A a = new A();
  
          b.accept(i);
  
      }
  
  }
  
  class A {
      void accept(I i) {
          System.out.println("A");
          i.visit(this);
      }
  }
  
  class B extends A {
      @Override
      void accept(I i) {
          System.out.println("B");
          i.visit(this);
      }
  }
  
  class I {
      void visit(A a) {
          System.out.println(" visit a");
      }
  
      void visit(B b) {
          System.out.println(" visit b");
      }
  }
  