How to Get List of Files from Directory in Java

on December 26, 2016

Post Views: 1,713

Get List of Files from Directory in Java

In this simple example, We will show you about how to get list of files from directory in Java. The example was tested and output shared in the post.

#1 Get all file names from directory

package com.dineshkrish.io;
import java.io.File;
/**
* 
* @author Dinesh Krishnan
*
*/
public class FileListExample1 {
public static void displayFileNames(String path) {
if (path != null && !path.isEmpty()) {
// defining File Object for Directory
File fileDirectory = new File(path);
// getting all file name from directory given
String[] fileNames = fileDirectory.list();
// validating and populating the array 
if (fileNames != null && fileNames.length > 0) {
for (int i = 0; i < fileNames.length; i++) {
// printing file name
System.out.println(fileNames[i]);
}
}
} else {
// print some error message here..
}
}
public static void main(String[] args) {
// the path or directory, which you can change accordingly.
String path = "C:/Users/dineshk/Desktop/my_directory";
// calling the method
FileListExample1.displayFileNames(path);
}
}

Output

a.txt
b.txt
c.txt
d.txt
e.txt
f.txt
g.txt
h.txt
i.txt

#2 Get all file as objects from directory

package com.dineshkrish.io;
import java.io.File;
/**
* 
* @author Dinesh Krishnan
* 
*/
public class FileListExample2 {
public static File[] getFiles(String path) {
// defining the file array object
File[] files = null;
if (path != null && !path.isEmpty()) {
// defining file object
File fileDirectory = new File(path);
// getting the list of file as object
files = fileDirectory.listFiles();
} else {
// print some error message here..
}
// returning the result
return files;
}
public static void main(String[] args) {
// you can change your path name
String path = "C:/Users/dineshk/Desktop/my_directory";
// method calling
File[] files = FileListExample2.getFiles(path);
// validating and populating the result
if (files != null && files.length > 0) {
for (File temp : files) {
// do something here
System.out.println(temp);
}
} else {
// print some error message here..
}
}
}

Output

C:\Users\dineshk\Desktop\my_directory\a.txt
C:\Users\dineshk\Desktop\my_directory\b.txt
C:\Users\dineshk\Desktop\my_directory\c.txt
C:\Users\dineshk\Desktop\my_directory\d.txt
C:\Users\dineshk\Desktop\my_directory\e.txt
C:\Users\dineshk\Desktop\my_directory\f.txt
C:\Users\dineshk\Desktop\my_directory\g.txt
C:\Users\dineshk\Desktop\my_directory\h.txt
C:\Users\dineshk\Desktop\my_directory\i.txt