How to use classes in java?

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Java

MVC

I'm currently learning MVC for java and I saw this simple tutorial.

What confuses me most is the use of classes

This is for the model:

package MyPackage;
 
public class Course {
       private String CourseName;
       private String CourseId;
       private String CourseCategory;
        
       public String getId() {
          return CourseId;
       }

This is for the VIEW:

package MyPackage;
 
public class CourseView {
       public void printCourseDetails(String CourseName, String CourseId, String CourseCategory){
          System.out.println("Course Details: ");
          System.out.println("Name: " + CourseName);
          System.out.println("Course ID: " + CourseId);
          System.out.println("Course Category: " + CourseCategory);
       }
    }

This is for the Controller:

package MyPackage;
 
public class CourseController {
       private Course model;
       private CourseView view;
 
       public CourseController(Course model, CourseView view){
          this.model = model;
          this.view = view;
       }

In the controller class where the code is written like this

private Course model;
private CourseView view;

is where I'm confused. The Course and CourseView was a Class but treated like a data type? I really don't get it. I got frustrated by this.

What I have tried:

I'm trying to find a good tutorial on what happened there but I don't know what to search for. I tried searching how to use classes in java.

NOTE: I didn't copy the whole code from the website because my thread will become long. I just copied what I think is needed to make my question clear.