Java8 Flatmap Demo code can be run directly __java

 reference from: http://www.cnblogs.com/shenlanzhizun/p/6027042.html 
 

Package com.by.interfaces;
Import java.util.ArrayList;
Import Java.util.Arrays;
Import java.util.List;

Import java.util.stream.Collectors; Class Student {public Student (long ID, string name, int age, int grade, string major, String school) {this.
        id = ID;
        THIS.name = name;
        This.age = age;
        This.grade = grade;
        This.major = major;
    This.school = School;
    Public Student (String name) {this.name = name;

    Public Student () {} private list<string> attributes = Arrays.aslist ("111", "222", "333");

    /** * Learning number/private long ID;

    private String name;

    private int age;

    /** * Grade * * private int grade;

    /** * Professional * * Private String major;

    /** * School * * Private String School;
    Public long GetId () {return id;
    public void SetId (long 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;
    public int Getgrade () {return grade;
    The public void Setgrade (int grade) {This.grade = grade;
    Public String Getmajor () {return major;
    } public void Setmajor (String major) {this.major = major;
    Public String Getschool () {return school;
    } public void Setschool (String school) {This.school = school;
    Public list<string> getattributes () {return attributes;
    public void SetAttributes (list<string> attributes) {this.attributes = attributes; } public class Main {public static void main (string[] args) {list<student> students = new Arraylis

        T<student> (); Students.add (New Student (20160001, "Hung Ming 4", 20, 1, "Civil Engineering", "Wuhan University");
        Students.add (New Student (20160002, "Bobbie", 21, 2, "Information security", "Wuhan University"));
        Students.add (New Student (20160003, "Hyun Tak", 22, 3, "economic management", "Wuhan University"));
        Students.add (New Student (20160004, "Cloud Long", 21, 2, "Information security", "Wuhan University"));
        Students.add (New Student (20161001, "Wing de", 21, 2, "Mechanical and automation", "Hust"));
        Students.add (New Student (20161002, "Yuan Zhi", 23, 4, "Civil Engineering", "Hust"));
        Students.add (New Student (20161003, "filial piety", 23, 4, "Computer Science", "Hust"));
        Students.add (New Student (20162001, "Zhongmo", 22, 3, "Civil Engineering", "Zhejiang University"));
        Students.add (New Student (20162002, "Lu Su", 23, 4, "Computer Science", "Zhejiang University"));

        Students.add (New Student (20163001, "Ding Bong", 24, 5, "Civil Engineering", "Nanjing University")); Maptolong use demo Double value = Students.stream (). Filter (Student-> "Computer Science". Equals (Student.getmajor ()). Mapto


        Long (AAA-> Aaa.getid ()). sum ();


        String[] STRs = {' Java8 ', ' is ', ' easy ', ' to ', ' use '};
      list<string[]> distinctstrs = Arrays.stream (STRs)          . map (str-> str.split (""))//mapping becomes stream<string[]>. DISTINCT (). Collec

        T (Collectors.tolist ());


        Distinctstrs.foreach (Strings-> Arrays.stream (strings). ForEach (S-> System.out.println (s)));

        System.out.println ("==================================map Way"); list<string> Distinctstrsbyflatmap = Arrays.stream (STRs). Map (str-> str.split (""))//mapping becomes Strea
                M<string[]>. Flatmap (Arrays::stream)//flattened to stream<string>. Distinct ()

        . Collect (Collectors.tolist ());

        Distinctstrsbyflatmap.foreach (S-> System.out.println (s));


        System.out.println ("==================================flatmap Way");
        list<list<student>> studentss = new arraylist<> ();
        Studentss.add (students);
        Studentss.add (students);

        System.out.println (Studentss.size ()); System.out.println ("Through the Flatmap place.After the stream to see what size is "+ studentss.stream (). Flatmap (Students1-> students1.stream ()). Count ()); System.out.println (Studentss.stream (). Flatmap (Students1-> students1.stream ()). Max (O1, O2)-> (O1.getname ().


        Length ()-o2.getname (). Length ())-get (). GetName ()); System.out.println ("After flatmap a thorough flow process to see how many streams" + studentss.stream (). Flatmap (Students1-> students1.stream ()).


        Flatmap (Student-> student.getattributes (). Stream ()). Count ()); Studentss.stream (). Flatmap (Students1-> students1.stream ()). Flatmap (Student-> ().


        

    Stream ()). ForEach (S-> System.out.println (s));
 }
}