Collections Api using Lambda expressions

Lambdas_04.java

package com.ucguy4u.functional.java;

import java.util.*;
import java.util.stream.Collectors;
import static java.util.Arrays.asList;

/**
 * @author chauhanuday
 */
public class Lambdas_04 {

	public static void main(String[] args) {
		List<String> names = Arrays.asList("Paul", "Jane", "Michaela", "Sam");
		// way to sort prior to Java 8 lambdas
		Collections.sort(names, new Comparator<String>() {
			@Override
			public int compare(String a, String b) {
				return b.compareTo(a);
			}
		});
		// first iteration with lambda
		Collections.sort(names, (String a, String b) -> {
			return b.compareTo(a);
		});
		// now remove the return statement
		Collections.sort(names, (String a, String b) -> b.compareTo(a));

		// now remove the data types and allow the compile to infer the type
		Collections.sort(names, (a, b) -> b.compareTo(a));

		// total pages in your book collection
		Book book1 = new Book("Miss Peregrine's Home for Peculiar Children", "Ranson", "Riggs", 382);
		Book book2 = new Book("Harry Potter and The Sorcerers Stone", "JK", "Rowling", 411);
		Book book3 = new Book("The Cat in the Hat", "Dr", "Seuss", 45);

		List<Book> books = Arrays.asList(book1, book2, book3);
		int total = books.stream().collect(Collectors.summingInt(Book::getPages));
		System.out.println("\n" + total);

		// create a list with duplicates
		List<Book> dupBooks = Arrays.asList(book1, book2, book3, book1, book2);
		System.out.println("\n" + "Before removing duplicates: ");
		System.out.println(dupBooks.toString());

		Collection<Book> noDups = new HashSet<>(dupBooks);
		System.out.println("\n" + "After removing duplicates: ");
		System.out.println(noDups.toString());

		// aggregate author first names into a list
		List<String> list = books.stream().map(Book::getAuthorLName).collect(Collectors.toList());
		System.out.println("\n" + list);

		// example of using Set to eliminate dups and sort automatically
		Set<Integer> numbers = new HashSet<>(asList(4, 3, 3, 3, 2, 1, 1, 1));
		System.out.println("\n" + numbers.toString());
	}
}

class Book {
	private String title;
	private String authorFName;
	private String authorLName;
	private int pages;

	public Book(String title, String authorFName, String authorLName, int pages) {
		this.title = title;
		this.authorFName = authorFName;
		this.authorLName = authorLName;
		this.pages = pages;

	}

	public String getTitle() {
		return title;
	}

	public void setTitle(String title) {
		this.title = title;
	}

	public String getAuthorFName() {
		return authorFName;
	}

	public void setAuthorFName(String authorFName) {
		this.authorFName = authorFName;
	}

	public String getAuthorLName() {
		return authorLName;
	}

	public void setAuthorLName(String authorLName) {
		this.authorLName = authorLName;
	}

	public int getPages() {
		return pages;
	}

	public void setPages(int pages) {
		this.pages = pages;
	}

	public String toString() {
		return getTitle() + " Written By: " + getAuthorFName() + " " + getAuthorLName() + "\n";
	}
}