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Java IO & NIO - Files.list() Examples

Java IO & NIO Java Java API 

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Class:

java.nio.file.Files

java.lang.Objectjava.lang.Objectjava.nio.file.Filesjava.nio.file.FilesLogicBig

Method:

public static Stream<Path> list(Path dir)
                         throws IOException

Return a lazily populated Stream , the elements of which are the entries in the directory. The listing is not recursive.

Parameters:
dir - The path to the directory
Returns:
The Stream describing the content of the directory


Examples


package com.logicbig.example.files;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.stream.Stream;

public class ListExample {

    public static void main(String... args) throws IOException {
        String pathString = System.getProperty("java.io.tmpdir");
        Path path = Paths.get(pathString);
        Stream<Path> list = Files.list(path);
        list.limit(5).forEach(System.out::println);
    }
}

Output

C:\Users\Joe\AppData\Local\Temp\+~JF1283084198655582245.tmp
C:\Users\Joe\AppData\Local\Temp\+~JF192051292487094235.tmp
C:\Users\Joe\AppData\Local\Temp\+~JF2519104209326462184.tmp
C:\Users\Joe\AppData\Local\Temp\+~JF33147415601443728.tmp
C:\Users\Joe\AppData\Local\Temp\+~JF3396327083016795947.tmp




package com.logicbig.example.files;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.stream.Stream;

public class ListExample2 {
    static boolean flg = false;

    public static void main(String... args) throws IOException {
        String pathString = System.getProperty("java.io.tmpdir");
        Path path = Paths.get(pathString);
        Stream<Path> list = Files.list(path);

        list.filter(p -> {
            if (flg && Files.isDirectory(p) || !flg && !Files.isDirectory(p)) {
                flg = !flg;
                return true;
            }
            return false;

        }).limit(5).forEach(ListExample2::printPathInfo);
    }

    private static void printPathInfo(Path path) {
        System.out.printf("Path: %s, isDir: %s%n", path,
                Files.isDirectory(path));
    }
}

Output

Path: C:\Users\Joe\AppData\Local\Temp\+~JF1283084198655582245.tmp, isDir: false
Path: C:\Users\Joe\AppData\Local\Temp\48B8E8A6-40E7-4235-937D-A07C61BFF851, isDir: true
Path: C:\Users\Joe\AppData\Local\Temp\9102561600275231376, isDir: false
Path: C:\Users\Joe\AppData\Local\Temp\a03bc02c-0894-482c-a2e8-bd298cee1cb6, isDir: true
Path: C:\Users\Joe\AppData\Local\Temp\adb.log, isDir: false

See Also