Recursion, Sorting, and Arraylists - Group 3

Recursion Hack

public void drawLine(int n) {
    
    for (int i = 1; i <= n; i++) {
        System.out.print("*");

    }

    if (n>0){
        System.out.println();
        drawLine(n - 1);
    }
}
drawLine(10);

**********
*********
********
*******
******
*****
****
***
**
*

Sorting Hack

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;

public class Main {
    public static void main(String[] args) {
        ArrayList<Country> countries = new ArrayList<Country>();
        countries.add(new Country("Russia", 17098246));
        countries.add(new Country("Australia", 7692024));
        countries.add(new Country("Argentina", 2780400));
        countries.add(new Country("United States", 9372610));
        countries.add(new Country("Canada", 9984670));
        countries.add(new Country("China", 9596961));
        countries.add(new Country("Brazil", 8515767));
        countries.add(new Country("India", 3287263));

        // Sort the countries in decreasing order of size using a selection sort algorithm and a Comparator
        Comparator<Country> sizeComparator = new Comparator<Country>() {
            @Override
            public int compare(Country c1, Country c2) {
                return c1.getSize() - c2.getSize();
            }
        };
        for (int i = 0; i < countries.size() - 1; i++) {
            int maxIndex = i;
            for (int j = i + 1; j < countries.size(); j++) {
                if (sizeComparator.compare(countries.get(j), countries.get(maxIndex)) > 0) {
                    maxIndex = j;
                }
            }
            if (maxIndex != i) {
                Collections.swap(countries, i, maxIndex);
            }
        }

        // Print the sorted countries
        for (Country country : countries) {
            System.out.println(country.getName() + " (" + country.getSize() + ")");
        }
    }
}

class Country {
    private String name;
    private int size;

    public Country(String name, int size) {
        this.name = name;
        this.size = size;
    }

    public String getName() {
        return name;
    }

    public int getSize() {
        return size;
    }
}

Main.main(null);

Russia (17098246)
Canada (9984670)
China (9596961)
United States (9372610)
Brazil (8515767)
Australia (7692024)
India (3287263)
Argentina (2780400)

Arraylists Hack

ArrayList<Integer> list = new ArrayList<Integer>();
list.add(3);
list.add(6);
list.add(9);
list.add(10);
list.add(2);
list.add(1);

public ArrayList<Integer> everyOther(ArrayList<Integer> list) {
    for (int i = list.size() - 1; i >= 0; i--) {
        if (i % 2 == 0) {
            list.remove(i);
        }
    }
    return list;
}

System.out.println(everyOther(list));

[6, 10, 1]

ArrayList<Character> list = new ArrayList<Character>();
list.add('k');
list.add('m');
list.add('s');
list.add('l');
list.add('o');
list.add('j');

public ArrayList<Character> overwrite(ArrayList<Character> list) {
    int originalSize = list.size();
    list.clear();
    for (char c = 'a'; c < 'a' + originalSize; c++) {
        list.add(c);
    }
    return list;
}

System.out.println(overwrite(list));

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