Thinking in Java 第18章 Java I/O系統 實例一 DirList

示例代碼

package io;

import java.io.File;
import java.io.FilenameFilter;
import java.util.Arrays;
import java.util.regex.Pattern;

public class DirList {
    public static void main(String[] args) {
        File path = new File("D:\\workspace\\TIJ4-code\\src\\io\\");
        String regex = args[0];
        System.out.println("regex: " + regex);
        String[] list;
        if (args.length == 0) {
            list = path.list();
        } else {
            list = path.list(new DirFilter(args[0]));
            // lambda
//            list = path.list((file,name) -> Pattern.compile(regex).matcher(regex).matches());
        }
        Arrays.sort(list, String.CASE_INSENSITIVE_ORDER);
        for (String dirItem : list) {
            System.out.println(dirItem);
        }
    }
}

class DirFilter implements FilenameFilter {
    private Pattern pattern;

    public DirFilter(String regex) {
        pattern = Pattern.compile(regex);
    }

    public boolean accept(File dir, String name) {
        return pattern.matcher(name).matches();
    }
}

文件路徑

args參數