- Java.io package classes
- Java.io - Home
- Java.io - BufferedInputStream
- Java.io - BufferedOutputStream
- Java.io - BufferedReader
- Java.io - BufferedWriter
- Java.io - ByteArrayInputStream
- Java.io - ByteArrayOutputStream
- Java.io - CharArrayReader
- Java.io - CharArrayWriter
- Java.io - Console
- Java.io - DataInputStream
- Java.io - DataOutputStream
- Java.io - File
- Java.io - FileDescriptor
- Java.io - FileInputStream
- Java.io - FileOutputStream
- Java.io - FilePermission
- Java.io - FileReader
- Java.io - FileWriter
- Java.io - FilterInputStream
- Java.io - FilterOutputStream
- Java.io - FilterReader
- Java.io - FilterWriter
- Java.io - InputStream
- Java.io - InputStreamReader
- Java.io - LineNumberInputStream
- Java.io - LineNumberReader
- Java.io - ObjectInputStream
- Java.io - ObjectInputStream.GetField
- Java.io - ObjectOutputStream
- io - ObjectOutputStream.PutField
- Java.io - ObjectStreamClass
- Java.io - ObjectStreamField
- Java.io - OutputStream
- Java.io - OutputStreamWriter
- Java.io - PipedInputStream
- Java.io - PipedOutputStream
- Java.io - PipedReader
- Java.io - PipedWriter
- Java.io - PrintStream
- Java.io - PrintWriter
- Java.io - PushbackInputStream
- Java.io - PushbackReader
- Java.io - RandomAccessFile
- Java.io - Reader
- Java.io - SequenceInputStream
- Java.io - SerializablePermission
- Java.io - StreamTokenizer
- Java.io - StringBufferInputStream
- Java.io - StringReader
- Java.io - StringWriter
- Java.io - Writer
- Java.io package extras
- Java.io - Interfaces
- Java.io - Exceptions
- Java.io package Useful Resources
- Java.io - Discussion
Java - File canWrite() Method
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 executed by the application.
Exception
SecurityException − If SecurityManager.checkWrite(java.lang.String) method denies write access to the file.
Example 1
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 present in the given location. Using canWrite() method, we're getting the writable status of 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://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 not writable.
F:\test.txt is writable: true
Example 2
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 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(); } } }
Output
Let us compile and run the above program, this will produce the following result − assuming that we're having a non-writable test2.txt file at the given location.
F:\test1.txt is writable: false
Example 3
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 in the given location. Using canWrite() method, we're getting the writable status of a 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(); } } }
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