Additional_Ass_1.java

class Book
{
    public String autor, titlu;

    public Book(String autor, String titlu)
    {
        this.autor = autor;
        this.titlu = titlu;
    }
    public boolean equals(Object o)
    {
        return (o instanceof Book) && ((Book)o).autor.equals(this.autor) && ((Book)o).titlu.equals(this.titlu);
    }
}

class Set
{
    private int max_elements, capacity = 0;
    private Book vector[];


    public Set(int x)
    {
        max_elements = x;
        vector = new Book[max_elements];
    }

    public boolean addBook(Book new_book)
    {
        if(capacity == max_elements)
            return false;
        else
        {
            if(capacity != 0)
                for(int i = 0; i < capacity; i++)
                {
                    if(vector[i].equals(new_book))
                        return false;
                }
            vector[capacity] = new_book;
            capacity++;
        }
        return true;
    }

    public String toString()
    {
        String buffer = "";
        for(int i = 0; i < capacity; i++)
            buffer +=  (i+1) + ". " + vector[i].autor + " : " + vector[i].titlu + "\n";

        return buffer;
    }

    public Set union(Set set_2)
    {
        int new_capacity = this.capacity + set_2.capacity;

        Set new_set = new Set(new_capacity);

        for(int i = 0 ; i < this.capacity; i++)
        {
            new_set.addBook(this.vector[i]);
        }

        for(int j = 0; j < set_2.capacity; j++)
        {
            new_set.addBook(set_2.vector[j]);
        }

        return new_set;
    }
}



public class Main
{


    public static void main(String[] args)
    {
        Book b1, b2, b3, b4;
        b1 = new Book("autor1","carte1");
        b2 = new Book("autor2","carte2");
        b3 = new Book("autor3","carte3");
        b4 = new Book("autor4","carte4");


        Set s1, s2;
        s1 = new Set(3);
        s2 = new Set(2);

        s1.addBook(b1);
        s1.addBook(b2);
        s1.addBook(b3);

        s2.addBook(b1);
        s2.addBook(b2);


        System.out.print(s1);
        System.out.print(s2);
        System.out.println("");
        System.out.println(s1.union(s2));

    }

}