last question is not solved yet

src/College.java

@@ -29,6 +29,7 @@ public class College {
         facultyLabs=new Lab[labCount];
         Student sampleStudent = new Student("Foo", "Bar", "99xxxxxx");
         for (int i = 0; i < facultyLabs.length; i++) {
+            facultyLabs[i] = new Lab(5, "dAy oF cLaSs");
             facultyLabs[i].enrollStudent(sampleStudent);
         }
     }
@@ -39,8 +40,15 @@ public class College {
      */
     public void print(int i){
         if(i>facultyLabs.length)
-            System.out.println("Faculty Has Not That Lab Class");
-        else
+            System.out.println("Faculty Has Not Lab Class No."+i);
+        else{
+            try {
                 facultyLabs[i-1].print();
             }
+            catch (Exception e){
+                System.out.println("");
+            }
+        }
+
+    }
 }

src/Lab.java

@@ -54,9 +54,11 @@ public class Lab {
      */
     public void print() {
         for (int i = 0; i < students.length; i++) {
+            if (students[i]!=null){
                 System.out.println("FirstName: " + students[i].getFirstName() + "\tLastName: " + students[i].getLastName() +
                         "\t\tID:" + students[i].getId() + "\t\tGrade:" + students[i].getGrade());
             }
+        }
         calculateAvg();
         System.out.println("AVERAGE GRADE: " + getAvg());
     }