File Permissions

Changing File Permissions 

Now that we know how to check the file permissions of any pathname provided, we just need to know how to manipulate these permissions so that we can suit the file according to our needs and make sure that the files are accessible at the particular levels of permissions at the request of the programmer.

setExecutable

setExecutable can change the permission to execute the file accessed by the pathname.

Example

import java.io.*;

public class test{
	public static void main(String[] args){
		File file = new File("D:\\test.txt");
        file.setExecutable(true);
		System.out.println(file.canExecute()); //Prints true as the permission was changed
    }
}

You can also try this code with Online Java Compiler

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setRead

setRead changes the read permission of a file to the value given as a parameter. However, there is a chance of failure if the user doesn’t have the permission to the specified path name.

Example

import java.io.*;

public class test{
	public static void main(String[] args){
		File file = new File("D:\\test.txt");
        file.setRead(true);
		System.out.println(file.canRead()); //Prints true as the permission was changed
    }
}

You can also try this code with Online Java Compiler

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setWrite

Similar to other set operations on files, this changes the permission of the file in the pathname, however, has the same vulnerability of failing if the user doesn’t have permission to the specified pathname.

Example

import java.io.*;

public class test{
	public static void main(String[] args){
		File file = new File("D:\\test.txt");
        file.setExecutable(true);
		System.out.println(file.canExecute()); //Prints true as the permission was changed
    }
}

You can also try this code with Online Java Compiler

Run Code

Practice it on online java compiler for better understanding.

FAQs

1. What is the specific class that contains these methods?

Ans: The java.io.FilePermission class contains the methods specified in this blog.

2. What are some other methods in FilePermission?

Ans: Some other methods regarding delete and readlink permissions are File.delete and readSymbolicLink.

3. What are the types of methods in Java?

Ans: There are two types of methods, user-defined methods,  and standard library methods.

4. How do we convert a file into a path?

Ans: We can convert the file into a path by using the toPath() method.

Key Takeaways

In this blog, we discussed how we can get the permissions on a particular file and how to manipulate it to suit the programmer.

You may want to learn more about different types of methods in java here.

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