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How to use method reference in Java 8 Stream | Java 8 streams tutorial | Streams in Java 8

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Ram N

Posts: 2777
Nickname: ramram
Registered: Jul, 2014

Ram N is Java Programmer
How to use method reference in Java 8 Stream | Java 8 streams tutorial | Streams in Java 8 Posted: Jul 13, 2017 7:51 AM
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This post originated from an RSS feed registered with Java Buzz by Ram N.
Original Post: How to use method reference in Java 8 Stream | Java 8 streams tutorial | Streams in Java 8
Feed Title: JAVA EE
Feed URL: http://ramj2ee.blogspot.com/feeds/posts/default?alt=rss
Feed Description: This blog has viedo tutorials and Sample codes related to below Technologies. 1.J2EE 2.Java 3.Spring 4.Hibernate 5.Database 6.Oracle 7.Mysql 8.Design Patterns
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Click here to watch in Youtube : 
https://www.youtube.com/watch?v=7qlJTI5oHaw&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.stream.Collectors;

/**
*
* Method Reference in stream.
*
*/

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));

List<String> productNameList = productList.stream()
.filter(p -> p.getPrice() > 20000) // filtering data
.map(Product::getName) // fetching Name by referring getName method
.collect(Collectors.toList()); // collecting as list

System.out.println(productNameList);

}
}
Output
[Sony mobile, Samsung mobile]

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

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

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

See also:
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  • Servlets Tutorial
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  • JDBC Tutorial
  • Java Collection Framework Tutorial
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  • Read: How to use method reference in Java 8 Stream | Java 8 streams tutorial | Streams in Java 8

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