java8 stream filter()

本文通过简单的例子向读者讲述filter过滤的使用，collect讲收集过滤的结果返回demo

package com.Cz.smile;import java.util.ArrayList;import java.util.Arrays;import java.util.List;import java.util.stream.Collectors;public class Java8Demo {    public static void main(String[] args) {        List<String> list= Arrays.asList("A","B","B","C","Y");        //Java8 之前        List<String> result=new ArrayList<>();        for (String str: list) {            if("B".equals(str)){                result.add(str);            }        }        System.out.println(result);        //Java8        List<String> demo= list.stream().filter(e->"B".equals(e)).collect(Collectors.toList());        System.out.println(demo);    }}