Ex 07, short questions

[Ben Kohr]

Hi,

two short questions:

- May we use case classes for SimpleUniversity and ComplexUniversity? The debug Strings produced by the administration tool are more understandable if we do so.
- The method declaration in Student should be "matriculationNumber", right? I declared it that way now.

Best,
Ben

[pmueller]

Hi,

- The method declaration in Student should be "matriculationNumber", right? I declared it that way now.

Yes.

- May we use case classes for SimpleUniversity and ComplexUniversity? The debug Strings produced by the administration tool are more understandable if we do so.

Do you mean the classes themselves or the Types they should contain?

Best,
Patrick

[Ben Kohr]

Thanks!

I mean the classes contained in SimpleUniversity and those contained in ComplexUniversity.

Best,
Ben

[nknauber]

I have an additional question regarding this. In the assignment it is stated, that within TSimpleUniversity there should be a trait corresponding to Student with the following methods declared:

sedc_ex_07.PNG (20.67 KiB) 1153 mal betrachtet

Is it on purpose, that there is a second method courses that returns a Sequence typed to an additional class named Courses? If so, how do we know what this additional class "Courses" should look like?

[pmueller]

Hi,

there should only be one method "courses". I have updated the exercise sheet.

I mean the classes contained in SimpleUniversity and those contained in ComplexUniversity.

You may use case classes for these.

Best,
Patrick

[emod02]

Another question regarding task 1.2 with the ComplexUniversity Class.
Should the types for Student, CourseOfStudies, Room and Course mix up the methods of both, TComplexUniversity and TSimpleUniversity?

So that this code will be possible?:

Code: Alles auswählen

	val cUni = new ComplexUniversity
	val r1 = cUni.Room("Room1", "Building1")
   	val hurr = r1.building()
    	val durr = r1.number()

[pmueller]

Hi,

Another question regarding task 1.2 with the ComplexUniversity Class.
Should the types for Student, CourseOfStudies, Room and Course mix up the methods of both, TComplexUniversity and TSimpleUniversity?

So that this code will be possible?:

Code: Alles auswählen

	val cUni = new ComplexUniversity
	val r1 = cUni.Room("Room1", "Building1")
   	val hurr = r1.building()
    	val durr = r1.number()

Yes.

Best,
Patrick

[emod02]

Hi,

Okay. And we should not mix it up in TComplexUniversity, as I understood it rigth?

Then I'm totally lost.

I have no clue, how I should create an instance of the mixed up traits of the super classes TComplexUniversity and TSimpleUniversity in the ComplexUniversity class.
Maybe someone can give me a hint into the right direction?

Greets Dominik

[pmueller]

Hi,

just as a heads up: in this exercise you will most likely produce code that is not accepted by the parses of IDEs(at least IntelliJ), but by the scala compiler.
So maybe you should try compiling your solution with sbt or scalac directly before dismissing it.

Best,
Patrick

[topracer]

just as a heads up: in this exercise you will most likely produce code that is not accepted by the parses of IDEs(at least IntelliJ), but by the scala compiler.
So maybe you should try compiling your solution with sbt or scalac directly before dismissing it.

Thank you for this hint, I was quite confused that IntelliJ complained about classes inheriting from multiple traits, but it still compiles and works fine!