Problem Set 1: Reflection

Please think back to all the work you did on Problem Set 1, across both the alpha and beta submissions, and answer the following questions.

reflection

PS1’s Design

Why did PS1 have only one method per Java file? For example, practice() was in Practice.java, update was in Update.java, etc.

because the Java language forbids having more than one public static method in a class

because Java programmers put each major method in its own class by convention

because it made it easier for 6.031’s autograder to extract your implementation and your test suite for each method, and grade them independently

because this is a good design that should be emulated

(missing explanation)

Which types used in PS1 would have been better-off encapsulated as the rep of an abstract data type?

List<Set<Flashcard>>, used as the buckets argument of practice()

Map<Flashcard, Integer>, used as the buckets argument of update()

Flashcard, used as the card argument of update()

Answer, used as the answer argument of update()

List<Integer>, used as the return type of getBucketRange()

(missing explanation)

Recall that toBucketSets() returns List<Set<Flashcard>>, and practice() takes this same type as an argument. This encourages a client to call them together, as in:

Practice.practice(day, BucketSets.toBucketSets(bucketMap), RETIRED_BUCKET)

What is wrong with this expression?

static typing prevents it; Java will give an error when you try to combine the two methods like this

it isn’t safe from bugs, because the postcondition of toBucketSets() is too weak to guarantee the precondition of practice()

nothing is wrong, it works fine

(missing explanation)

Time Spent

How much time in hours did you spend working on the alpha? Please enter a number (which may be a decimal fraction).

How much time in hours did you spend working on code review? Please enter a number (which may be a decimal fraction).

How much time in hours did you spend working on the beta? Please enter a number (which may be a decimal fraction).