Java8新特性——lambda表达式.（案例：公司业务）

需求:现有一个员工姓名list,其中包含单字母索引.要求输出一个字符串,去掉所有单字母,所有名字首字母大写并用逗号隔开.

 package cn._2.thecompanyprocess;

 import java.util.List;
 import java.util.stream.Collectors;

 public class Process {

     // BEGIN java8_process
     public String cleanNames(List<String> names) {
         if (names == null) return "";
         return names
                 .stream()
                 .filter(name -> name.length() > )
                 .map(name -> capitalize(name))
                 .collect(Collectors.joining(","));
     }

     private String capitalize(String e) {
         return e.substring(, ).toUpperCase() + e.substring(, e.length());
     }
     // END java8_process

     // BEGIN java8_process_parallel
     public String cleanNamesP(List<String> names) {
         if (names == null) return "";
         return names
                 .parallelStream()
                 .filter(n -> n.length() > )
                 .map(e -> capitalize(e))
                 .collect(Collectors.joining(","));
     }
 // END java8_process_parallel

 }

测试类:

 package cn._2.thecompanyprocess;

 import java.util.ArrayList;
 import java.util.List;

 public class Mmain {

     public static void main(String[] args) {
         @SuppressWarnings("serial")
         List<String> list = new ArrayList<String>(){{
             add("a");add("alic");add("art");add("c");add("curry");
             add("f");add("fred");add("h");add("haha");add("harry");
         }};
         System.out.println(new Process().cleanNames(list));
         System.out.println(new Process().cleanNamesP(list));
     }
 }