Recursion Data Structure Training

Article.java

public class Article {

    private String title;
    private List<Article> children = new ArrayList<>();

    Article(String title, List<Article> children) {
        this.title = title;
        this.children = children;
    }

    String getTitle() {
        return title;
    }

    List<Article> getChildren() {
        return children;
    }
}

ArticleMain.java

public class ArticleMain {

    public static void main(String[] args) {
        Article home = new Article("Home", new ArrayList<Article>() {{
            add(new Article("Inspiration", new ArrayList<Article>() {{
                add(new Article("Lifestyle", new ArrayList<Article>() {{
                    add(new Article("Health", new ArrayList<>()));
                    add(new Article("Wealth", new ArrayList<>()));
                }}));
                add(new Article("Foodie", new ArrayList<Article>() {{
                    add(new Article("Domestics", new ArrayList<>()));
                }}));
                add(new Article("Accessories", new ArrayList<>()));
            }}));
            add(new Article("News", new ArrayList<Article>() {{
                add(new Article("Sports", new ArrayList<Article>() {{
                    add(new Article("Football", new ArrayList<Article>() {{
                        add(new Article("Premier League", new ArrayList<>()));
                        add(new Article("La Liga", new ArrayList<>()));
                    }}));
                    add(new Article("Basketball", new ArrayList<>()));
                    add(new Article("Athletics", new ArrayList<>()));
                    add(new Article("Baseball", new ArrayList<>()));
                    add(new Article("Chess", new ArrayList<>()));
                }}));
                add(new Article("Fashion", new ArrayList<>()));
                add(new Article("Awards", new ArrayList<>()));
                add(new Article("Events", new ArrayList<>()));
            }}));
            add(new Article("Gallery", new ArrayList<Article>() {{
                add(new Article("Photos", new ArrayList<Article>(){{
                    add(new Article("Night Art", new ArrayList<>()));
                    add(new Article("Brand Ambassadors", new ArrayList<>()));
                }}));
                add(new Article("Videos", new ArrayList<>()));
            }}));
            add(new Article("About Us", new ArrayList<Article>() {{
                add(new Article("Contact Us", new ArrayList<>()));
                add(new Article("Help", new ArrayList<>()));
            }}));
        }});
        
        //Create a method to print the article tree
        //What are the parameters?
    }
}

Printed articles.txt

Home
	Inspiration
		Lifestyle
			Health
			Wealth
		Foodie
			Domestics
		Accessories
	News
		Sports
			Football
				Premier League
				La Liga
			Basketball
			Athletics
			Baseball
			Chess
		Fashion
		Awards
		Events
	Gallery
		Photos
			Night Art
			Brand Ambassadors
		Videos
	About Us
		Contact Us
		Help

Robber.java

class Robber {

    String name;
    int diamond;
    Robber[] underlings;

    Robber(String name, int diamond, Robber[] underlings) {
        this.name = name;
        this.diamond = diamond;
        this.underlings = underlings;
    }
}

RobberMain.java

public class RobberMain {

    public static void main(String[] args) {
        Robber boss = new Robber("Ali", 10, new Robber[]{
                new Robber("Andy", 20, new Robber[]{
                        new Robber("Dino", 5, new Robber[]{
                                new Robber("Fang", 3, new Robber[]{}),
                                new Robber("George", 2, new Robber[]{
                                        new Robber("Heidi", 7, new Robber[]{})
                                })
                        }),
                        new Robber("Gaby", 7, new Robber[]{})
                }),
                new Robber("Boy", 9, new Robber[]{
                        new Robber("Danny", 9, new Robber[]{}),
                        new Robber("Eddy", 11, new Robber[]{
                                new Robber("Harry", 10, new Robber[]{}),
                                new Robber("Irene", 4, new Robber[]{})
                        }),
                        new Robber("Elise", 3, new Robber[]{})
                }),
                new Robber("Celia", 11, new Robber[]{})
        });

        System.out.println("Total diamonds obtained: " + getTotalDiamonds(boss));
        System.out.println("Total command level of the syndicate: " + getCommandLevel(boss));
    }

    private static int getTotalDiamonds(Robber robber) {
        if (robber.underlings.length == 0) {
            return robber.diamond;
        } else {
            int total = robber.diamond;
            for (Robber r: robber.underlings) {
                total += getTotalDiamonds(r);
            }
            return total;
        }
        //return 0;
    }

    private static int getCommandLevel(Robber robber) {
        if (robber.underlings.length == 0) {
            return 0;
        } else {
            int maxOrder = 0;
            for (Robber r: robber.underlings) {
                int temp = getCommandLevel(r);
                if (temp > maxOrder) {
                    maxOrder = temp;
                }
            }
            return 1 + maxOrder;
        }
        //return 0;
    }
    
    private static int getMostDiamond(Robber robber) {
        if (robber.underlings.length == 0) {
            return robber.diamond;
        } else {
            int maxDiamond = robber.diamond;
            for (Robber r: robber.underlings) {
                int temp = getMostDiamond(r);
                if (temp > maxDiamond) {
                    maxDiamond = temp;
                }
            }
            return maxDiamond;
        }
    }
}