####1. 什么是stream * stream被定义为泛型接口 * stream接口代表数据流 * stream不是一个数据结构，不直接存储数据 * stream通过管道操作数据 ####2. 什么是管道 * 管道包括： 1、数据集：可以是集合、数组等list 、array 2、过滤器filter 3、终端操作，如Stream.forEach方法 ####3. 什么是过滤器 * stream的过滤器可以匹配数据源，并返回一个stream对象。 ``` Stream stream = list.stream(); stream = stream.filter(p->p.getSex=='男'); ``` #####4. stream实战 1. 创建Student实例 ``` package com.fantJ.JAVA_8; /** * Created by Fant.J. * 2017/12/12 21:46 */ public class Student { private String name; private int age; private String sex; 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 String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } @Override public String toString() { return "Student{" + "name='" + name + '\'' + ", age=" + age + ", sex='" + sex + '\'' + '}'; } public Student(String name, String sex, int age) { this.name = name; this.age = age; this.sex = sex; } } ``` 2. 创建Stream_Collection类 ``` package com.fantJ.JAVA_8; import java.util.ArrayList; import java.util.List; import java.util.stream.Stream; /** * Created by Fant.J. * 2017/12/12 21:46 */ public class Stream_Collection { public static void main(String[] args) { List list = init(); //获取stream对象 Stream stream = list.stream(); //遍历集合 stream.forEach(p-> System.out.println(p.toString())); } static List init(){ List list = new ArrayList<>(); Student student = new Student("老焦","男",1); list.add(student); student = new Student("老王","男",1); list.add(student); student = new Student("老赵","女",1); list.add(student); return list; } } ```  #####5. stream filter实战 稍微修改下Stream_Collection这个类的main方法如下， ``` List list = init(); //stream过滤器的实例 list.stream() .filter(p->p.getSex() .equals("女")) .forEach(p-> System.out.println(p.toString())); ``` 这个过滤器是实现对性别是“女”进行过滤并打印。  ######6.进阶