java.io.File canRead()
Description
On this document we will be showing a java example on how to use the canRead() method of File Class. This method is basically a check if the file can be read. On some platforms it may be possible to start the Java virtual machine with special privileges that allow it to read files that are marked as unreadable. Consequently this method may return true even though the file does not have read permissions.
This method returns SecurityException – If a security manager exists and its SecurityManager.checkExec(java.lang.String) method denies read access to the file
Method Syntax
public boolean canRead()
Method Argument
Data Type | Parameter | Description |
---|---|---|
N/A | N/A | N/A |
Method Returns
This method returns boolean, true if and only if the file specified by this abstract pathname exists and can be read by the application; false otherwise.
Compatibility
Requires Java 1.0 and up
Java File canRead() Example
Below is a java code demonstrates the use of canRead() method of File class. The example presented might be simple however it shows the behaviour of the canRead() method. Basically we initialize a new File object that corresponds to a physical file which does have permission for reading and then the canExecute() method is used to check if the input file can be read.
package com.javatutorialhq.java.examples; import java.io.File; /* * This example source code demonstrates the use of * canRead() method of File class. * */ public class FileCanReadExample { public static void main(String[] args) { // initialize File object File file = new File("C:javatutorialhqtest.bat"); // check first if file exists if(file.exists()){ //check if file can be execute if(file.canRead(){ System.out.println("user have permission to read the file"); } else{ System.out.println("File cannot be read"); } } else{ System.out.println("File does not exists"); } } }