content: package com.alibaba.json.bvt.writeClassName;
  
  import junit.framework.Assert;
  import junit.framework.TestCase;
  
  import com.alibaba.fastjson.JSON;
  import com.alibaba.fastjson.serializer.SerializerFeature;
  
  public class WriteClassNameTest2 extends TestCase {
  
      public void test_writeClassName() throws Exception {
          A a = new A();
          a.setB(new B());
          String text = JSON.toJSONString(a, SerializerFeature.WriteClassName);
          System.out.println(text);
          Assert.assertEquals("{\"@type\":\"com.alibaba.json.bvt.writeClassName.WriteClassNameTest2$A\",\"b\":{\"id\":0}}",
                              text);
  
          A a1 = (A) JSON.parse(text);
  
          Assert.assertNotNull(a1.getB());
      }
  
      public static class A {
  
          private B b;
  
          public B getB() {
              return b;
          }
  
          public void setB(B b) {
              this.b = b;
          }
  
      }
  
      public static final class B {
  
          private int id;
  
          public int getId() {
              return id;
          }
  
          public void setId(int id) {
              this.id = id;
          }
  
      }
  }
  