Create a Class object and get the full structure of the class

To create an object of a class: The Newinstance method of the Bar class object

1. Class must have an argument-free constructor

2. The constructor of the class must have sufficient access rights.

No parameterless constructor can also be created:

1. The constructor for the specified formal parameter type of this class is obtained through the class Getdeclaredconstructor.

2. Pass an array of objects into the constructor's formal parameters, which contains each parameter required in the constructor

3. There is a method public in the constructor class Newinstance

Null parameter constructor called by the run-time class

Create a Class object and get the full structure of the class