import java.lang.reflect.Field;

public class Reflect {

  public static void main(String args[]) {
    try {
      ReflectClass a = new ReflectClass();
      for (int i=0; i< a.getClass().getDeclaredFields().length; i++) {
        Field f = a.getClass().getDeclaredFields()[i];
        f.setAccessible(true);
        f.set(a, "value" + i);
      }
      System.out.println(a);
    } catch (Exception e) {
      e.printStackTrace(System.err);
    }
  }
}

class ReflectClass {
  private String field1;
  private String field2;

  public String toString() {
    return "<field1>" + field1 + "</field1>" + "<field2>" + field2 + "</field2>";
  }
}