cannot find symbol even the classes are in same package , same directory

Question

I have two classes, one is Course, another is CourseController. They are in the same package , same path; But when I compile javac CourseController.java, Intellij says :"error: cannot find symbol"

Course:

package com.mjfirstSBv5.sprintboot.learnspringboot;

public class Course {
    private int id;
    private  String name;
    private  String author;

    public Course(int id, String name, String author)
    {
        super(); //why this?
        this.author = author;
        this.name =name;
        this.id = id;



    }

    @Override
    public String toString() {
        return "Course{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", author='" + author + '\'' +
                '}';
    }

    public int getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public String getAuthor() {
        return author;
    }
}

CourseController

package com.mjfirstSBv5.sprintboot.learnspringboot;


//import org.springframework.web.bind.annotation.RestController;

import java.util.Arrays;
import java.util.List;

//@RestController
public class CourseController {

    public List<Course> retrieveAllCourses()
    {
        return Arrays.asList(
                new Course(1, "learn aws", "28min"),
                new Course(2, "learn spring boot", "28min" )

        );

    }

}

PS D:\AutoQA_Progress\intg-mock-service\learn-spring-boot\src\main\java\com\mjfirstSBv5\sprintboot\learnspringboot> javac Course.java

PS D:\AutoQA_Progress\intg-mock-service\learn-spring-boot\src\main\java\com\mjfirstSBv5\sprintboot\learnspringboot> javac CourseController.java  
CourseController.java:12: error: cannot find symbol
    public List<Course> retrieveAllCourses()
                ^                           
  symbol:   class Course                    
  location: class CourseController  
        
CourseController.java:15: error: cannot find symbol 
                new Course(1, "learn aws", "28min"),
                    ^                               
  symbol:   class Course
  location: class CourseController

CourseController.java:16: error: cannot find symbol
                new Course(2, "learn spring boot", "28min" )
                    ^
  symbol:   class Course
  location: class CourseController

3 errors
PS D:\AutoQA_Progress\intg-mock-service\learn-spring-boot\src\main\java\com\mjfirstSBv5\sprintboot\learnspringboot> 

enter image description here

Answer 1

Compile Course first. The other class needs it to be compiled.