Monday, 29 May 2017

Lambda expression in java[How to filter the list of product using lambda expression and Streams]


Click here to watch in Youtube :
https://www.youtube.com/watch?v=dg5HiojPb8k&list=UUhwKlOVR041tngjerWxVccw

Product.java
class Product
{
    private int id;
    private String name;
    private float price;

    public Product(int id, String name, float 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 float getPrice()
    {
        return price;
    }

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

}
LambdaDemo.java
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Stream;

/**
 * Java Lambda Expression Example: Filter Collection Data
 *
 */
public class LambdaDemo
{

    public static void main(String[] args)
    {
        List<Product> list = new ArrayList<Product>();

        // Adding Products
        list.add(new Product(1, "Sony LED TV", 60000f));
        list.add(new Product(2, "Radio", 3000f));
        list.add(new Product(3, "Laptop", 80000f));
        list.add(new Product(4, "Smart phone", 70000f));
        list.add(new Product(5, "Mouse", 1500f));

        /*
         * Using lambda to filter data
         */
        Stream<Product> filteredStream = list.stream()
                                       .filter(p -> p.getPrice() > 50000);

        /*
         * Using lambda to iterate through collection
         */
        filteredStream.forEach(product -> System.out.println(
                product.getName() + ": " + product.getPrice()));
    }

}
Output
Sony LED TV: 60000.0
Laptop: 80000.0
Smart phone: 70000.0
Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/LambdaDemo_filter_product_App.zip?attredirects=0&d=1

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

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/4c13bd19ff03c6acdc5e87d7803290d625ce640a/BasicJava/LambdaDemo_filter_product_App/?at=master

See also:

  • All JavaEE Viedos Playlist
  • All JavaEE Viedos
  • All JAVA EE Links
  • Servlets Tutorial
  • All Design Patterns Links
  • JDBC Tutorial
  • Java Collection Framework Tutorial
  • JAVA Tutorial
  • Kids Tutorial
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