184. Creating a hidden class

Let’s assume that our hidden class is named InternalMath and is as simple, as follows:

public class InternalMath {
  public long sum(int[] nr) {
    return IntStream.of(nr).sum();
  }
}

As we mentioned in the previous problem, hidden classes have the same class loader as the lookup class, which can be obtained via MethodHandles.lookup(), as follows:

MethodHandles.Lookup lookup = MethodHandles.lookup();

Next, we must know that Lookup contains a method named defineHiddenClass(byte[] bytes, boolean initialize, ClassOption... options). The most important argument is represented by the array of bytes that contain the class data. The initialize argument is a flag specifying if the hidden class should be initialized or not, while the options argument can be NESTMATE (the created hidden class becomes a nestmate of the lookup class and has access to all the private members in the same nest) or STRONG (the created hidden class can be unloaded...