Rockstar Java Dev series: Using Lambda expressions

Product.java

import java.util.ArrayList;
import java.util.List;
import java.util.function.Predicate;

interface ProductFilter
{
	public boolean run(Product p);
}

public class Product 
{
	public String name;
	public double price;
	public String size;
	
	//Navie approach
	public static List<Product> search(List<Product> stock, String name) 
	{
		ArrayList<Product> r = new ArrayList<Product>();
		for (Product p : stock)
		{
			if (p.name.compareTo(name)==0) {
				r.add(p);
			}
		}
		return r;
	}
	
	//Classic Java Programmer approach
	public static List<Product> searchWithRange(List<Product> stock, String name, double minValue, double maxValue)
	{
		ArrayList<Product> r = new ArrayList<Product>();
		for (Product p : stock)
		{
			if (p.name.compareTo(name)==0 && (p.price>=minValue && p.price<=maxValue)) {
				r.add(p);
			}
		}
		return r;
	}
	
	//Expert Java Programmer approach
	public static List<Product> searchWithInterface(List<Product> stock, ProductFilter filter)
	{
		ArrayList<Product> r = new ArrayList<Product>();
		for (Product p : stock)
		{
			if (filter.run(p)) {
				r.add(p);
			}
		}
		return r;
	}
	
	//Rockstar Java Programmer approach
	public static List<Product>  searchWithLambda(List<Product> stock, Predicate<Product> filter) 
	{
		ArrayList<Product> r = new ArrayList<Product>();
		for (Product p : stock)
		{
			if (filter.test(p)) {
				r.add(p);
			}
		}
		return r;
	}
	
	public static void main(String[] args) 
	{
		ArrayList<Product> list = new ArrayList<Product>();
		list.add(new Product(){{ 
				name  = "foo";
				size = "15in";
				price=25;
			}});
		
		//List<Product> r =  Product.search(list,"foo"); //naive
		//List<Product> r =  Product.searchWithRange(list,"foo",10,50); //classic
		
		//~ List<Product> r =  Product.searchWithInterface(list,new ProductFilter(){
			//~ public boolean run(Product p) {
					//~ return (p.name=="foo" && (p.price>=10 && p.price<=50) && p.size=="15in");
				//~ }
			//~ }); //expert
			
		//~ List<Product> r =  Product.searchWithInterface(list,
		//~ (Product p) -> (p.name=="foo" && (p.price>=10 && p.price<=50) && p.size=="15in")); //rockstar1
		
		List<Product> r =  Product.searchWithLambda(list,
		(Product p) -> (p.name=="foo" && (p.price>=10 && p.price<=50) && p.size=="15in")); //rockstar2
			
		System.out.println(r.size());
	}
	
}