The isReadOnly() method of a FileStore class is used to return true if this file store is read-only else false. A file store is called read-only if it does not support write operations or other changes to files. An IOException to be thrown if an attempt to create a file, open an existing file for writing, etc occurs. Syntax:
public abstract String isReadOnly()
Parameters: This method accepts nothing. Return value: This method returns true if, and only if, this file store is read-only. Below programs illustrate the isReadOnly() method: Program 1:Â
Java
// Java program to demonstrate// FileStore.isReadOnly() methodÂ
import java.io.IOException;import java.nio.file.FileStore;import java.nio.file.Files;import java.nio.file.Path;import java.nio.file.Paths;Â
public class GFG {Â
    public static void main(String[] args)        throws IOException    {Â
        // create object of Path        Path path            = Paths.get(                "E:\\Tutorials\\file.txt");Â
        // get FileStore objectÂ
        FileStore fs            = Files.getFileStore(path);Â
        // print FileStore name        System.out.println("FileStore Name: "                           + fs.name());        // if file is readable        boolean isReadOnly = fs.isReadOnly();        System.out.println("FileStore isReadOnly:"                           + isReadOnly);    }} |
Output: 
Program 2:Â
Java
// Java program to demonstrate// FileStore.isReadOnly() methodÂ
import java.io.IOException;import java.nio.file.FileStore;import java.nio.file.Files;import java.nio.file.Path;import java.nio.file.Paths;Â
public class GFG {Â
    public static void main(String[] args)        throws IOException    {Â
        // create object of Path        Path path            = Paths.get(                "C:\\Movies\092;048;01.txt");Â
        // get FileStore objectÂ
        FileStore fs            = Files.getFileStore(path);Â
        // print FileStore name        System.out.println("FileStore Name: "                           + fs.name());        // if file is readable        boolean isReadOnly = fs.isReadOnly();        System.out.println("FileStore isReadOnly:"                           + isReadOnly);    }} |
Output: References: https://docs.oracle.com/javase/10/docs/api/java/nio/file/FileStore.html#isReadOnly()
