Files isReadable() method in Java with Examples

isReadable() method of java.nio.file.Files help us to check whether Java virtual machine has appropriate privileges that would allow it to open this file for reading or not. This method test file is readable or not. This method checks that a file exists or not and if file exists then it is readable or not. This method returns true if the file exists and is readable or it would return false if the following cases:

  • file does not exist
  • execute access would be denied because the Java virtual machine has insufficient privileges,
  • Access cannot be determined.

Syntax:

public static boolean isReadable(Path path)

Parameters: This method accepts a parameter path which is the path to the file to check.



Return value: This method returns true if the file exists and is readable or it would return false if the following cases:

  • file does not exist
  • execute access would be denied because the Java virtual machine has insufficient privileges,
  • Access cannot be determined.

Exception: This method will throw SecurityException in the case of the default provider, and a security manager is installed, the checkRead is invoked to check read access to the file.

Below programs illustrate isReadable(Path) method:
Program 1:

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// Java program to demonstrate
// Files.isReadable() method
  
import java.io.IOException;
import java.nio.file.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create object of Path
        // This file is available on windows and
        // It is a readable file.
  
        Path path
            = Paths.get(
                "D:\\GIT_EWS_PROJECTS\\logger"
                + "\\src\\logger"
                + "\\GFG.java");
  
        // check whether this file
        // is readable or not
        boolean result;
        result = Files.isReadable(path);
  
        System.out.println("File " + path
                           + " is Readable = "
                           + result);
    }
}

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Output:

Program 2:

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// Java program to demonstrate
// Files.isReadable() method
  
import java.io.IOException;
import java.nio.file.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create an object of Path
        // This file is available on windows and
        // It is not a readable file.
  
        Path path
            = Paths.get(
                "D:\\User Aman\\"
                + "Documents\\MobaXterm\\"
                + "\\ArrayList.docx");
  
        // check whether this file
        // is readable or not
        boolean result;
        result = Files.isReadable(path);
  
        System.out.println("File " + path
                           + " is Readable = "
                           + result);
    }
}

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Output:

References: https://docs.oracle.com/javase/10/docs/api/java/nio/file/Files.html#isReadable(java.nio.file.Path)



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