class Product
{
    private int id;
    private String name;
    private int price;

    public Product(int id, String name, int price)
    {
        super();
        this.id = id;
        this.name = name;
        this.price = price;
    }

    public int getId()
    {
        return id;
    }

    public void setId(int id)
    {
        this.id = id;
    }

    public String getName()
    {
        return name;
    }

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

    public int getPrice()
    {
        return price;
    }

    public void setPrice(int price)
    {
        this.price = price;
    }

    @Override
    public String toString()
    {
        return "Product [id=" + id + ", name=" + name + ", price="
                + price + "]";
    }

}

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

/**
 *
 * Find Max and Min Product Price.
 *
 */
public class StreamDemo
{
    public static void main(String[] args)
    {
        List<Product> productList = new ArrayList<Product>();

        // Adding Products
        productList.add(new Product(1, "Sony mobile", 25000));
        productList.add(new Product(2, "Lenovo mobile", 15000));
        productList.add(new Product(3, "Nokia mobile", 10000));
        productList.add(new Product(4, "Samsung mobile", 40000));


         // max() method to get max Product price
        Product maxPriceProduct = productList.stream()
                        .max((product1, product2)->
                        product1.getPrice() > product2.getPrice() ? 1: -1).get();

        System.out.println("Max price product = "+maxPriceProduct);


        // min() method to get min Product price
        Product minPriceProduct = productList.stream()
                .min((product1, product2)->
                product1.getPrice() > product2.getPrice() ? 1: -1).get();

        System.out.println("Min price product = "+minPriceProduct);

    }
}

Max price product = Product [id=4, name=Samsung mobile, price=40000]
Min price product = Product [id=3, name=Nokia mobile, price=10000]