Collections in Scala, Groovy and Java 8

Book.java

public class Book {

    private String name;
    private String author;
    private int numberOfPages;

    public Book(String name, String author, int numberOfPages) {
        this.name = name;
        this.author = author;
        this.numberOfPages = numberOfPages;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public int getNumberOfPages() {
        return numberOfPages;
    }

    public void setNumberOfPages(int numberOfPages) {
        this.numberOfPages = numberOfPages;
    }

    @Override
    public boolean equals(Object o) {
        return name.equals(((Book) o).name);
    }

    @Override
    public int hashCode() {
        return name.hashCode();
    }

    @Override
    public String toString() {
        return this.name + " : " + this.author + " : " + this.numberOfPages;
    }
}