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() > 1)
                .map(name -> capitalize(name))
                .collect(Collectors.joining(","));
    }

    private String capitalize(String e) {
        return e.substring(0, 1).toUpperCase() + e.substring(1, 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() > 1)
                .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));
    }
}