package q3;
public class Student
{
    /**
     * <p>This is the main method (entry point) that gets called by the JVM.</p>
     *
     * @param args command line arguments.
     */
     int a, b, c;
     public Student(int a1, int b1, int c1)
     {
         a = a1;
         b = b1;
         c = c1;
     }

---------------

package q4;
public class Course
{
    String courseName; // String variable representing Course Name.
    int studentCounter; // Student Counter for number of students in a course.
    Student z1, z2, z3, z4, z5; // Five students.

----------------

q4/Course.java:6: cannot find symbol
symbol  : class Student
location: class q4.Course
    Student z1, z2, z3, z4, z5; // Five students.