Click here to watch in Youtube :
https://www.youtube.com/watch?v=ruVGaln6rJs&list=UUhwKlOVR041tngjerWxVccw
Student.java
https://sites.google.com/site/ramj2eev1/home/javabasics/StreamDemo_flatmap_streamofset.zip?attredirects=0&d=1
Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StreamDemo_flatmap_streamofset
Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/53e39342c1c41555c6e548783b3cf96ab7bd9ee6/BasicJava/StreamDemo_flatmap_streamofset/?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
https://www.youtube.com/watch?v=ruVGaln6rJs&list=UUhwKlOVR041tngjerWxVccw
Student.java
import java.util.HashSet; import java.util.Set; public class Student { private String name; private Set<String> bookSet; public void addBook(String bookName) { if (this.bookSet == null) { this.bookSet = new HashSet<>(); } this.bookSet.add(bookName); } public String getName() { return name; } public void setName(String name) { this.name = name; } public Set<String> getBookSet() { return bookSet; } public void setBookSet(Set<String> bookSet) { this.bookSet = bookSet; } }FlatMapDemo1.java
import java.util.ArrayList; import java.util.List; import java.util.Set; import java.util.stream.Collectors; import java.util.stream.Stream; public class FlatMapDemo1 { public static void main(String[] args) { Student student1 = new Student(); student1.setName("Peter"); student1.addBook("Java in Action"); student1.addBook("Spring in Action"); student1.addBook("Ruby in Action"); Student student2 = new Student(); student2.setName("John"); student2.addBook("Java in Action"); student2.addBook("Learning Java Script"); List<Student> studentList = new ArrayList<>(); studentList.add(student1); studentList.add(student2); /* * Stream<Set<String>> */ Stream<Set<String>> setStream = studentList.stream() .map(student -> student.getBookSet()); /* * Stream<Set<String>> to Stream<String> */ Stream<String> stringStream = setStream // Stream<Set<String>> .flatMap(student -> student.stream()); // Stream<String> List<String> bookList = stringStream.distinct() .collect(Collectors.toList()); bookList.forEach(bookName -> System.out.println(bookName)); } }Output
Ruby in Action Java in Action Spring in Action Learning Java ScriptFlatMapDemo2.java
import java.util.ArrayList; import java.util.List; import java.util.stream.Collectors; public class FlatMapDemo2 { public static void main(String[] args) { Student student1 = new Student(); student1.setName("Peter"); student1.addBook("Java in Action"); student1.addBook("Spring in Action"); student1.addBook("Ruby in Action"); Student student2 = new Student(); student2.setName("John"); student2.addBook("Java in Action"); student2.addBook("Learning Java Script"); List<Student> studentList = new ArrayList<>(); studentList.add(student1); studentList.add(student2); List<String> bookList = studentList.stream() .map(student -> student.getBookSet()) // Stream<Set<String>> .flatMap(student -> student.stream()) // Stream<String> .distinct().collect(Collectors.toList()); bookList.forEach(bookName -> System.out.println(bookName)); } }Output
Ruby in Action Java in Action Spring in Action Learning Java ScriptClick the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/StreamDemo_flatmap_streamofset.zip?attredirects=0&d=1
Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StreamDemo_flatmap_streamofset
Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/53e39342c1c41555c6e548783b3cf96ab7bd9ee6/BasicJava/StreamDemo_flatmap_streamofset/?at=master
See also:
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