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How to convert Stream of Person to Stream of String using map method of Java 8 Stream

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Ram N

Posts: 2777
Nickname: ramram
Registered: Jul, 2014

Ram N is Java Programmer
How to convert Stream of Person to Stream of String using map method of Java 8 Stream Posted: Jul 7, 2017 8:23 AM
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This post originated from an RSS feed registered with Java Buzz by Ram N.
Original Post: How to convert Stream of Person to Stream of String using map method of Java 8 Stream
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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Person.java
public class Person
{
private int id;
private String name;
private int age;

public Person(int id, String name, int age)
{
super();
this.id = id;
this.name = name;
this.age = age;
}

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 getAge()
{
return age;
}

public void setAge(int age)
{
this.age = age;
}

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

}
StreamDemo.java
import java.util.Arrays;
import java.util.List;

/**
*
* How to convert Stream<Person> to Stream<String> using map method of
* Stream.
*
*/

public class StreamDemo
{
public static void main(String[] args)
{

List<Person> personList = Arrays.asList(new Person(1, "Ram", 25),
new Person(2, "Peter", 31),
new Person(3, "Steve", 25),
new Person(4, "Balu", 32));


String name = personList.stream() //convert list to stream
.filter(x -> "Peter".equals(x.getName())) // we want "Peter" only
.map(Person::getName) //convert Stream<Person> to Stream<String>
.findAny() // If 'findAny' then return found
.orElse(null); // If not found, return null

System.out.println(name);
}

}
Output
Peter

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

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

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/c8efc47167637d9bcc657c3cee2ad048e22a2b17/BasicJava/StreamDemo_map_app/?at=master

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