3.20 Tutorial 3

Task 7

Using ArrayList​ from java.util​, define a class Catalog​ that:

• Maintains a list of books.
• Allows adding and removing books.
• Prints all books in the catalog.

import java.util.ArrayList;
import java.util.Iterator;

public class Catalog
{

    private ArrayList<String> books;

    public Catalog()
    {
        books = new ArrayList<>();
    }

    public void addBook(String name) 
    {
        books.add(name);
    }

    public void removeBook(String name)
    {
        books.remove(name);
    }

    public void printBookFor()
    {
        for(String bookName : books) 
        {
            System.out.println(bookName);
        }
    }

    public void printBookWhile()
    {
        int index = 0;
        while(index < books.size())
        {
            System.out.println(books.get(index));
            index++;
        }
    }

    public void printBookIerator()
    {
        Iterator<String> it = books.iterator();
        while(it.hasNext())
        {
            String t = it.next();
            System.out.println(t);
        }

    }
}

Task 8

Complete all methods in the temperature measurements project provided with this guide.

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Task 9

Extend the temperature measurements project by implementing:

• A method countExtremeTemperatures()​ to count temperatures above 39°C or below -15°C.

Task 10

Further extend the temperature measurements project by adding:

• A method that computes the number of consecutive measurements with the same temperature.

Task 11

Add a method countExtremeTemperatureChanges()​ that detects extreme temperature changes, defined as:

1. A non-extreme temperature followed by an extreme one.

2. An extreme temperature followed by a non-extreme one.

3. A cold extreme followed by a hot extreme.

4. A hot extreme followed by a cold extreme.

Task 14

In music-organizer-v3, implement a method that allows playing all songs by a specific artist.

• Analyze the MusicPlayer​ class.
• Use the for-each​ iteration pattern for selective processing.

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