Java - File canWrite() method

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Description

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

Declaration

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

 public boolean canWrite() 

Parameters

NA

Return Value

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

Exception

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

Example - Usage of File canWrite() method

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.

FileDemo.java

 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(); } } } 

Output

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 

Example - Usage of File canWrite() method

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.

FileDemo.java

 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(); } } } 

Output

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 

Example - Usage of File canWrite() method

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.

FileDemo.java

 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(); } } } 

Output

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