This site is from a past semester! The current version is here.

Week 8 [Oct 7]

Questions to discuss during tutorial:

Explain what Gradle is. How is it used in your project?
Explain what Travis is. How is it used in your project?
What’s the difference between buffers and padding/inflating estimates?

Suggested tutorial activities

A course in the university can have a number tasks which can be assignments or tests. Some assignments are compulsory.
When a student attempts a task, a grade and an optional feedback is given.

Explain the meaning of various class diagram notations in the following class diagram:

Consider the code below:

public interface Billable {
    void bill();
}

public abstract class Item
         implements Billable {
    public abstract void print();
}

public class StockItem extends Item {
    private Review review;
    private String name;

    public StockItem(
        String name, Rating rating){

        this.name = name;
        this.review = new Review(rating);
    }

    @Override
    public void print() {
        //...
    }

    @Override
    public void bill() {
        //...
    }
}

public enum Rating {
    GOOD, OK, POOR
}

public class Review {
    private final Rating rating;

    public Review(Rating rating) {
        this.rating = rating;
    }
}

import java.util.List;

public class Inventory {
    private List<Item> items;

    public int getItemCount(){
        return items.size();
    }

    public void generateBill(Billable b){
        // ...
    }

    public void add(Item s) {
        items.add(s);
    }
}

(a) Draw a class diagram to represent the code
(b) Draw an object diagram to represent the situation where the inventory has one item with a name spanner and a review of POOR rating.

Explain the interactions depicted in this sequence diagram.

First, the createParser() method of an existing ParserFactory object is called. Then, ...

Draw a sequence diagram to represent this code snippet.

if (isFirstPage) {
    new Quote().print();
}

The Quote class:

class Quote{

    String q;

    Quote(){
        q = generate();
    }

    String generate(){
        // ...
    }

    void print(){
        System.out.println(q);
    }

}

Show new Quote().print(); as two method calls.
As the created Quote object is not assigned to a variable, it can be considered as 'deleted' soon after its print() method is called.