1.1.Java8的流库——从迭代到流的操作

一切尽在代码中…

package com.example.demo;

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.List;




public class CountLongWords {
    public static void main(String[] args) throws IOException {
        //读取该路径文件内容
        String contents = new String(Files.readAllBytes(
                Paths.get("D:\gutenberg\Test.txt")), StandardCharsets.UTF_8);
        //对获取到的文件内容进行切割，装进集合中。
        List words = Arrays.asList(contents.split("\PL+"));


        long count = 0;
        
        for (String word : words) {
            if (word.length() > 10) {
                count++;
            }
        }
        System.out.println(count);

        
        count = words.stream().filter(w -> w.length() > 10).count();
        System.out.println(count);


        
        count = words.parallelStream().filter(w -> w.length() > 10).count();
        System.out.println(count);


        
        count = words.stream().limit(5).filter(w -> w.length() > 10).count();
            System.out.println(count);
        }
    }

1.使用正则表达式