Write a Java program to print all files and folders in a directory in sorted order :
In this tutorial, we will print out all files and folders of a directory in sorted order using Java. To run this program, you will have to change the directory name defined inside ‘main’ method.
Steps :
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Create a new ‘File’ object by passing the scanning directory name to its constructor
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Get list of all files and folders using ‘listFiles()’ method
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Sort the list using ‘Arrays.sort()’ method
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Now , using a ‘for-loop’, iterate through this list and get the name of each file or folder using ‘getName()’
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If it is a file, we are printing ‘File ’ before the file name and if it is a folder we are printing ‘Directory :‘.
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To check if a file, use ‘isFile()’ . To check if a directory, use ‘isDirectory()‘.
Example Program :
/*
* Copyright (C) 2017 codevscolor
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.io.File;
import java.util.Arrays;
/**
* Example class
*/
public class ExampleClass {
//utility method to print a string
static void print(String value) {
System.out.println(value);
}
/**
* Method to sort all files and folders in a directory
*
* @param dirName : directory name
* @return : No return value. Sort and print out the result
*/
private static void sortAll(String dirName) {
File directory = new File(dirName);
File[] filesArray = directory.listFiles();
//sort all files
Arrays.sort(filesArray);
//print the sorted values
for (File file : filesArray) {
if (file.isFile()) {
print("File : " + file.getName());
} else if (file.isDirectory()) {
print("Directory : " + file.getName());
} else {
print("Unknown : " + file.getName());
}
}
}
public static void main(String[] args) {
sortAll("C://Programs/");
}
}
