java面试-(7)--编程题

Java上机实现统计某一目录下每个文件中出现的字母个数、数字个数、空格个数及行数？

package pers.ascend.kukii.core.interview.other.计算字符个数;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 说明：
 *
 * @author ascend
 * 2020/10/23 14:28
 */
public class Client {
    public static void main(String[] args) throws IOException {
        String packagePath = "pers.ascend.kukii.core.interview.other.计算字符个数";
        String basePath = Objects.requireNonNull(Client.class.getClassLoader().getResource("")).getPath();
        String path = basePath.substring(1).replace("target/classes", "src/main/java") + "/" + packagePath.replace('.', '/');
        List<File> files = listFile(path);
        files.forEach(file -> System.out.println(file.getName()));

        Pattern charP = Pattern.compile("[a-zA-Z]");
        AtomicInteger charCount = new AtomicInteger();
        Pattern numberP = Pattern.compile("\\d");
        AtomicInteger numberCount = new AtomicInteger();
        Pattern spaceP = Pattern.compile(" ");
        AtomicInteger spaceCount = new AtomicInteger();

        files.forEach(file -> {
            try {
                String input = Files.readString(file.toPath());
                Matcher charM = charP.matcher(input);
                while (charM.find()) {
                    charCount.getAndIncrement();
                }
                Matcher numberM = numberP.matcher(input);
                while (numberM.find()) {
                    numberCount.getAndIncrement();
                }
                Matcher spaceM = spaceP.matcher(input);
                while (spaceM.find()) {
                    spaceCount.getAndIncrement();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        });
        System.out.println("charCount.get() = " + charCount.get());
        System.out.println("numberCount.get() = " + numberCount.get());
        System.out.println("spaceCount.get() = " + spaceCount.get());

    }

    private static List<File> listFile(String path) throws IOException {
        List<File> retList = new ArrayList<>();
        Files.list(Paths.get(path)).forEach(path1 -> {
            if (path1.toFile().isDirectory()) {
                try {
                    retList.addAll(listFile(path1.toString()));
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } else {
                retList.add(path1.toFile());
            }
        });
        return retList;
    }
}

看这里，看这里
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参考文章：https://blog.youkuaiyun.com/u_ascend/article/details/109244454