Java 8 Syntactic Sugar Makes Practice For Java Advanced Certification More Enjoyable

PracticeWithComparator

package quizzes;

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;

public class Practice {
	
	private static List<Product> products;

	public static void main(String[] args) {
		
		products = new ArrayList<Product>();
		
		Product aBook = new Product ("A book for programmers", 10);
		Product anotherBook = new Product("Another programming book", 7);
		Product poemBook = new Product("Poems");
		Product aNovel = new Product("A Journal");
		Product recipes = new Product("Cook Book", 9);
		
		products.add(aBook);
		products.add(anotherBook);
		products.add(poemBook);
		products.add(aNovel);
		products.add(recipes);
		
		products.stream()
		.sorted(new CompareProducts())
		.forEach(product -> {
		System.out.println(product.name + " " + product.customerLikes);
		});

	}

}

class Product{
	String name;
	Integer customerLikes;
	
	public Product(String name, Integer likes){
		this.name = name;
		customerLikes = likes;
	}
	
	public Product(String name){
		this.name = name;
	}
	
}

class CompareProducts implements Comparator<Product>{

	@Override
	public int compare(Product arg0, Product arg1) {
		
		if(arg0.customerLikes == null) return 1;
		if(arg1.customerLikes == null) return -1;
		return arg0.customerLikes < arg1.customerLikes ? 1:-1;
		
	}
	
}