Thursday, 13 July 2017

How to convert the productList to map using Java 8 Stream | Java 8 streams tutorial | Java 8 streams


Click here to watch in Youtube : 
https://www.youtube.com/watch?v=jkm-YKPxKwg&list=UUhwKlOVR041tngjerWxVccw

Product.java
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 + "]";
    }

}
StreamDemo.java
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * 
 * Convert List into Map.
 * 
 */
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));
        productList.add(new Product(5, "Micromax mobile", 10000));

        // Converting Product List into a Map
        Map<String, Integer> productPriceMap = productList.stream()
                .collect(Collectors.toMap(p -> p.getName(), p -> p.getPrice()));

        System.out.println(productPriceMap);

    }
}
Output
{Nokia mobile=10000, Lenovo mobile=15000, Samsung mobile=40000, Micromax mobile=10000, Sony mobile=25000}

Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/StreamDemo_list_to_map_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StreamDemo_list_to_map_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/0279ebcce40946c6a80779824fa3df4a8c5201d9/BasicJava/StreamDemo_list_to_map_App/?at=master

See also:
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  • Java Collection Framework Tutorial
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