How to Hide child model class properties name in java reflection

I have a very big model class, I want to create a toString method for this model. But there're a lot of field in this model, so I try to use a Common model and Java reflection. But the output is include sub model field name, is it posible to remove this ?

I have 1 abstract model class as below:

import java.lang.reflect.*;

public abstract class CommonEntity {

  public String getInsertString() {
    StringBuilder sb = new StringBuilder();
    try {
      Field[] fields = this.getClass().getDeclaredFields();

      for (Field field : fields) {

        field.setAccessible(true);        

        Object value = field.get(this);
        if (value != null) {          
          sb.append("\"" + value.toString() + "\",");
        }

      }

    } catch (Exception e) {
      System.out.println(e);
    }
    return sb.toString();
  }

}

And 2 other model extend this common

test:

@Data
public class test extends CommonEntity {
  private String name;
  private String last;
  private test2 test;
}

test2:

@Data
public class test2 extends CommonEntity {
  private String name2;
  private String last2;
}

And main class:

public static void main(String[] args) {
    test a = new test();
    a.setName("1");
    a.setLast("2");

    test2 b = new test2();
    b.setLast2("3");
    b.setName2("4");
    a.setTest(b);

    System.out.println(a.getInsertString());

}

Console output :

"1","2","test2(name2=4, last2=3)",

My expectation:

"1","2","4","3,

Is it posible to remove

test2(name2

and

last2

in ouput.