How to get permissions( Read, Write, Execute) of given file in Java?

Problem Description :

Write a program in Java that checks whether given file is readable, writable or executable.

How to get file permission in Java?

Concept :

We need to use following methods of File class that is present in java.io.* package.

1. public boolean canExecute() - Checks whether file is executable or not.
2. public boolean canWrite() - Checks whether file is writable or not.
3. public boolean canRead() - Checks whether file is readable or not.

Java Program :

	package com.javamultiplex.filehandling;
	import java.io.File;
	import java.io.IOException;
	import java.util.Scanner;
	/**
	*
	* @author Rohit Agarwal
	* @category File Handling
	* @problem How to get given file permissions in Java?
	*
	*/
	public class FilePermission {
	public static void main(String[] args) throws IOException {
	Scanner input = null;
	try {
	input = new Scanner(System.in);
	System.out.println("Enter file name with extension : ");
	String fileName = input.nextLine();
	if (isValidFileName(fileName)) {
	// file present in current working directory.
	File file = new File(fileName);
	if (file.exists()) {
	System.out.println("Executable : " + file.canExecute());
	System.out.println("Readable : " + file.canRead());
	System.out.println("Writable : " + file.canWrite());
	} else {
	System.out.println("File is not present in current directory.");
	}
	} else {
	System.out.println("File name is not valid.");
	}
	} finally {
	if (input != null) {
	input.close();
	}
	}
	}
	private static boolean isValidFileName(String fileName) {
	// Regular expression for validating file name.
	String pattern = "^.+\\..+$";
	boolean result = false;
	if (fileName.matches(pattern)) {
	result = true;
	}
	return result;
	}
	}

view raw FilePermission.java hosted with ❤ by GitHub

Output :

Output - How to get file permissions in Java?

Properties of file "demo.txt"

References :

https://docs.oracle.com/javase/7/docs/api/java/io/File.html#canExecute()

https://docs.oracle.com/javase/7/docs/api/java/io/File.html#canRead()

https://docs.oracle.com/javase/7/docs/api/java/io/File.html#canWrite()

https://docs.oracle.com/javase/7/docs/api/java/io/File.html#exists()

https://en.wikipedia.org/wiki/Regular_expression

Thank you friends, I hope you have clearly understood the solution of this problem. If you have any doubt, suggestion or query please feel free to comment below. You can also discuss this solution in our forum.

Tags : File Handling, get file permissions, if else, Scanner, String, File, canExecute(), canRead(), canWrite(), exists(), Regular expression, java.io

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