- Given a file in java, check read, write & execute permissions of a file.
- We would like to check whether file has read only or read write permissions.
- We will also check whether file is hidden or not.
- We will use File class to check permission & hidden attributes of a file.
| No. | File Api | Description |
|---|---|---|
| 1 | boolean canRead() | Tests whether the application can read the file denoted by this abstract pathname. |
| 2 | boolean canWrite() | Tests whether the application can modify the file denoted by this abstract pathname. |
| 3 | boolean canExecute() | Tests whether the application can execute the file denoted by this abstract pathname. |
| 4 | boolean isHidden() | Tests whether the file named by this abstract pathname is a hidden file. |
- We have kept three files in a input directory, namely readOnlyFile.txt, readWriteFile.txt & hiddenFile.txt.
- We will check read, read write, execute permissions of a file.
- We will also check whether given file is hidden or not.
Program: check read,write permission & hidden attribute of file in java
package org.learn.io;import java.io.File;import java.io.IOException;public class CheckFilePermissions { public static void main(String[] args) throws IOException { String inputDirectory = "C:\\ioOPerations"; String readOnlyFile = "readOnlyFile.txt"; String readWriteFile = "readWriteFile.txt"; String hiddenFile = "hiddenFile.txt"; boolean isReadOnly = false; boolean isReadWrite = false; boolean isHidden = false; boolean isCanExecute =false; //Checking permission for read only file File fileReadOnly = new File (inputDirectory + File.separator + readOnlyFile); isReadOnly = fileReadOnly.canRead(); isReadWrite = fileReadOnly.canWrite(); isHidden = fileReadOnly.isHidden(); isCanExecute = fileReadOnly.canExecute(); System.out.printf("1. File %s is ReadOnly=%b, ReadWrite=%b, Hidden=%b, canExecute=%b", fileReadOnly.getCanonicalPath(),isReadOnly,isReadWrite, isHidden, isCanExecute); File fileReadWrite = new File (inputDirectory + File.separator + readWriteFile); isReadOnly = fileReadWrite.canRead(); isReadWrite = fileReadWrite.canWrite(); isHidden = fileReadWrite.isHidden(); System.out.printf("\n2. File %s is ReadOnly=%b, ReadWrite=%b, Hidden=%b, canExecute=%b", fileReadWrite.getCanonicalPath(),isReadOnly,isReadWrite, isHidden, isCanExecute); File fileHidden = new File (inputDirectory + File.separator + hiddenFile); isReadOnly = fileHidden.canRead(); isReadWrite = fileHidden.canWrite(); isHidden = fileHidden.isHidden(); System.out.printf("\n3. File %s is ReadOnly=%b, ReadWrite=%b, Hidden=%b, canExecute=%b", fileHidden.getCanonicalPath(),isReadOnly,isReadWrite, isHidden, isCanExecute); }} |
Output: check read,write permission & hidden attribute of file in java
1. File C:\ioOperations\readOnlyFile.txt is ReadOnly=true, ReadWrite=false, Hidden=false, canExecute=true2. File C:\ioOperations\readWriteFile.txt is ReadOnly=true, ReadWrite=true, Hidden=false, canExecute=true3. File C:\ioOperations\HiddenFile.txt is ReadOnly=true, ReadWrite=true, Hidden=true, canExecute=true |