Question

I was very confused about the reflection and wrapper, I know that reflection can reflect the object into another object type, wrapper can convert the primitive type into object. Is this correct?

Answer 1

A wrapper will wrap around another object which may hide some of the complexities of using the original object / provide diffrent naming conventions etc.

forgive the C# syntax and the fairly contrived example

class SimplePerson{

    ComplexPerson _person;

    public void WalkForward (int steps){
      
        for (int i = 0; i < steps; i ++){
            _person.LeftFoot ();
            _person.MoveFoot ();
            _person.PlaceFoot ();
        }
    }
    // More methods
}

Reflection on the other hand can be used to retrieve methods / fields / properties and metadata in general from an object.

Again forgive the C#

SimplePerson _person;

Console.WriteLine ("Class {0} has the following methods:", _person.GetType().Name); 

foreach (var method in _person.GetType().GetMethods()){
    Console.WriteLine ("\t {0}", method.Name);
}

which should give output something like (depending on the class obviously)

Class SimplePerson has the following methods:

    Eat         
    WalkForward
    RunForward