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File canRead() method in Java with Examples

  • Last Updated : 22 Sep, 2020
Geek Week

The canRead()function is a part of the File class in Java. This function determines whether the program can read the file denoted by the abstract pathname. The function returns true if the abstract file path exists and the application is allowed to read the file.

Function signature: 

public boolean canRead()

Syntax: 

file.canRead()

Parameters: This method does not accept any parameter.

Return Value: The function returns a boolean value representing whether the application is allowed to read the file or not.



Exception: This method throws Security Exception if the read access to the file is denied.

Below programs illustrates the use of canRead() function:

Example 1: The file “F:\\program.txt” is readable
 

Java




// Java program to demonstrate
// canRead() method of File Class
 
import java.io.*;
 
public class solution {
    public static void main(String args[])
    {
 
        // Get the file
        File f = new File("F:\\program.txt");
 
        // Check if the specified file
        // can be read or not
        if (f.canRead())
            System.out.println("Can be Read");
        else
            System.out.println("Cannot be Read");
    }
}

Output: 

Can be Read

Example 2: The file “F:\\program1.txt” is NOT readable
 

Java




// Java program to demonstrate
// canRead() method of File Class
 
import java.io.*;
 
public class solution {
    public static void main(String args[])
    {
 
        // Get the file
        File f = new File("F:\\program1.txt");
 
        // Check if the specified file
        // can be read or not
        if (f.canRead())
            System.out.println("Can be Read");
        else
            System.out.println("Cannot be Read");
    }
}

Output: 

Cannot be Read

Note: The programs might not run in an online IDE. Please use an offline IDE and set the path of the file.

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