Java - File getUsableSpace() Method

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Description

The Java 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 1

The following example shows the usage of Java File getUsableSpace() method. We've created a File reference. Then we're creating a File Object using F:/test directory which is present in the provided location. Now using getUsableSpace() method, we're getting the usable bytes in the partition.

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("F:\\test.txt");
         
         // get number of usable bytes
         v = f.getUsableSpace();
         
         // true if the file path exists
         bool = f.exists();
         
         // if file exists
         if(bool) {
         
            // prints
            System.out.print("number of usable bytes: "+v);
         }
         
      } catch(Exception e) {
         // if any error occurs
         e.printStackTrace();
      }
   }
}

Output

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

number of usable bytes: 163281137664

Example 2

The following example shows the usage of Java File getUsableSpace() method. We've created a File reference. Then we're creating a File Object using C:/test directory which is present in the provided location. Now using getUsableSpace() method, we're getting the usable bytes in the partition.

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("C:\\test");
         
         // get number of usable bytes
         v = f.getUsableSpace();
         
         // true if the file path exists
         bool = f.exists();
         
         // if file exists
         if(bool) {
         
            // prints
            System.out.print("number of usable bytes: "+v);
         }
         
      } catch(Exception e) {
         // if any error occurs
         e.printStackTrace();
      }
   }
}

Output

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

number of usable bytes: 4245991424