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Showing content from https://www.tutorialspoint.com/java/io/file_canwrite.htm below:

Java - File canWrite() method

The Java File canWrite() method returns true if the file can be written by its abstract name.

Following is the declaration for java.io.File.canWrite() method −

public boolean canWrite()

NA

This method returns boolean value. True, if the path name exists and the file is allowed to be written by the application.

• SecurityException − If SecurityManager.checkWrite(java.lang.String) method denies write access to the file.

The following example shows the usage of Java File canWrite() method. We've created a File reference.

Then we're creating a File Object using test.txt file which is present in the given location.

Using canWrite() method, we're getting the writable status of a writable file. Then using getAbsolutePath(), we're getting the absolute path of the file. Lastly we're printing file name and its writable status.

package com.tutorialspoint;

import java.io.File;

public class FileDemo {
   public static void main(String[] args) {      
      File f = null;               
      try {
         
         // create new file
         f = new File("test.txt");

         // true if the file is writable
         boolean bool = f.canWrite();

         // find the absolute path
         String path = f.getAbsolutePath(); 

         // prints
         System.out.println(path + " is writable: "+ bool);

      } catch(Exception e) {
         // if any I/O error occurs
         e.printStackTrace();
      }
   }
}

Let us compile and run the above program, this will produce the following result assuming that we're having a test.txt file at the current location and is writable.

F:\Workspace\Tester\test.txt is writable: true

The following example shows the usage of Java File canWrite() method. We've created a File reference.

Then we're creating a File Object using a file which is not writable being readonly

Using canWrite() method, we're getting the writable status of a non-writable file. Then using getAbsolutePath(), we're getting the absolute path of the file. Lastly we're printing file name and its writable status.

package com.tutorialspoint;

import java.io.File;

public class FileDemo {
   public static void main(String[] args) {      
      File f = null;      
         
      try {
         // create new file
         f = new File("F://test1.txt");

         // true if the file is writable
         boolean bool = f.canWrite();

         // find the absolute path
         String path = f.getAbsolutePath(); 

         // prints
         System.out.println(path + " is writable: "+ bool);

      } catch(Exception e) {
         // if any I/O error occurs
         e.printStackTrace();
      }
   }
}

Let us compile and run the above program, this will produce the following result assuming that we're having a non-writable test1.txt file at the given location.

F:\test1.txt is writable: false

The following example shows the usage of Java File canWrite() method. We've created a File reference.

Then we're creating a File Object using a file which is not present at the given location.

Using canWrite() method, we're getting the writable status of a non-writable file. Then using getAbsolutePath(), we're getting the absolute path of the file. Lastly we're printing file name and its writable status.

package com.tutorialspoint;

import java.io.File;

public class FileDemo {
   public static void main(String[] args) {      
      File f = null;      
         
      try {
         // create new file
         f = new File("F://test2.txt");

         // true if the file is writable
         boolean bool = f.canWrite();

         // find the absolute path
         String path = f.getAbsolutePath(); 

         // prints
         System.out.println(path + " is writable: "+ bool);

      } catch(Exception e) {
         // if any I/O error occurs
         e.printStackTrace();
      }
   }
}

Let us compile and run the above program, this will produce the following result assuming that we're not having a test2.txt file at the given location and thus is not writable.

F:\test2.txt is writable: false

java_io_file_methods.htm

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