Fixed some errors related to access modifiers and member variables.

src/java_exercises2_1_1/TestUni.java

@@ -16,8 +16,16 @@ public class TestUni {
 		//Register student Martin
 		uni.register(student);
 		uni.deregister(student);
-		//The member variables of Student are not directly accessible due to the private access modifier.
+		//Some member variables of class Student are not directly accessible due to the private access modifier.
 		//If you uncomment the following line you will get a compile error.
-		//student.name;
+		
+		//the name variable is public and hence accessible.
+		System.out.println(student.name);
+		//The id variable is protected and hence accessible from subclasses or classes within the same package.
+		System.out.println(student.id);
+		//The grades variable is private and hence not directly accessible from anywhere outside.
+		//--> So the line below would not compile
+		//System.out.println(student.grades);
+	
 	}
 }

src/java_exercises2_1_1/other/TestUni.java

@@ -11,7 +11,7 @@ public class TestUni {
 		//Student.name is public, hence accessible
 		System.out.println(stud.name);
 		
-		//Student.id is protected, hence not accessible
+		//Student.id is protected, hence not accessible from another package if the class is not a subclass.
 		//System.out.println(stud.id);
 		
 		//Student.grades is private, hence not accessible