Java.io.File.getUsableSpace() Method

Description

The java.io.File.getUsableSpace() method returns the number of bytes available to this virtual machine on the partitioned named by this abstract name. This method usually provide a more accurate estimate of how much new data can actually be written as this method checks for write permissions and other operating system restrictions.

Declaration

Following is the declaration for java.io.File.getUsableSpace() method:

public long getUsableSpace()

Parameters

• NA

Return Value

The method returns the number of available bytes on the partition.

Exception

• SecurityException -- If a security manager has been installed and it denies RuntimePermission("getFileSystemAttributes") or its SecurityManager.checkRead(String) method denies read access to the file.

Example

The following example shows the usage of java.io.File.getUsableSpace() method.

package com.tutorialspoint;

import java.io.File;

public class FileDemo {
   public static void main(String[] args) {
      
      File f = null;
      long v;
      boolean bool = false;
      
      try{
         // create new file
         f = new File("test.txt");
         
         // number of bytes available
         v = f.getUsableSpace();
         
         // true if the file path exists
         bool = f.exists();
         
         // if file exists
         if(bool)
         {
            // prints
            System.out.print("number of bytes available: "+v);
         }
      }catch(Exception e){
         // if any error occurs
         e.printStackTrace();
      }
   }
}

Let us compile and run the above program, this will produce the following result:

number of bytes available: 210589159424