Gson Examples. Two data classes corresponding Java code

TwoDataClasses.java

public final class WithoutDefaultConstructor {
   private final int intValue;
   @NotNull
   private final String strValue;

   public WithoutDefaultConstructor(int intValue, @NotNull String strValue) {
      super();
      this.intValue = intValue;
      this.strValue = strValue;
   }

   public WithoutDefaultConstructor(int intValue, String strValue, int defaultParametersFlags, DefaultConstructorMarker defaultConstructorMarker) {
      if ((defaultParametersFlags & 2) != 0) {
         strValue = "default";
      }

      this(intValue, strValue);
   }
   //... other methods
}


public final class WithDefaultConstructor {
   private final int intValue;
   @NotNull
   private final String strValue;

   public WithDefaultConstructor(int intValue, @NotNull String strValue) {
      super();
      this.intValue = intValue;
      this.strValue = strValue;
   }

   public WithDefaultConstructor(int intValue, String strValue, int defaultParametersFlags, DefaultConstructorMarker defaultConstructorMarker) {
      if ((defaultParametersFlags & 1) != 0) { // checking binary flag for the first parameter presence `01`
         intValue = 1;
      }

      if ((defaultParametersFlags & 2) != 0) { // checking binary flag for the second parameter presence `10`
         strValue = "default";
      }

      this(intValue, strValue);
   }

   public WithDefaultConstructor() {
      this(0, (String)null, 3, (DefaultConstructorMarker)null);
   }
   //... other methods 
}