Need help on java objects & classes?

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Java

constructor

properties

Here what the question ask: Build a class called Course.java. This class should have 4 properties: CourseId, CourseName, Description, and credit hours. Also add the appropriate set and get methods. Add a display() method to display these 4 properties out to the DOS window. Lastly add a main() method for testing. In the main() method instantiate a Course object, fill it with data using the set methods, then call the display method to display the data.

I just want to make sure is my code right & if there are mistake in my code can you suggestions of how to fix them.

Here is my code:

What I have tried:

public class Course {

//   ========================== Properties ===========================
private int courseid;
private String courseName;
private String description;
private String creditHours;

//   ==========================  Behaviors  ==========================
public void setCourseId(int c) { courseid = c; }
public int getCourseId() { return courseid;}

public void setCourseName(String cn) { courseName = cn; }
public String getCourseName() { return courseName;}

public void setDescription(String d) { description = d; }
public String getDescription() { return description;}

public void setCreditHours(int ch) { ch = 4; }
public int getCreditHours() { return ch;}

//Returning String
public String toString() {
    return courseName + ":" + description + ":" + creditHours;
}

public void display() {
    System.out.println("Course ID             = " + getCourseId());
    System.out.println("Course Name      = " + getCourseName());
    System.out.println("Description      = " + getDescription());
    System.out.println("Credit Hours           = " + getCreditHours());

} //end display()





public static void main(String args []) {

    Course c1;
    c1 = new Course();

    c1.setCourseId(109);
    c1.setCourseName("Intro to Python");
    c1.setDescription("This course intros the Python Prog Lang.");
    c1.setCreditHours(4);

    c1.display();


    //Test out toString() method
    System.out.println(c1);
} //end main