File getUsableSpace() method in java with examples

The getUsableSpace() function is a part of File class in Java . This function returns the unallocated size of the partition denoted by the abstract pathname, if the pathname does not exist then it returns 0L. This function is more accurate than the getFreeSpace() function as it returns the free space allocated to this virtual machine. This function gives a hint of the unallocated space of the partition but does not give any guarantee that the exact number of bytes is Usable. An error might be caused if an external application writes to the specified file, then the write operation might not succeed. If there is no clear distinction it will return the same value as getFreeSapce() method.

Function signature:

public long getUsableSpace()

Syntax:



long var = file.getUsableSpace();

Parameters: This method does not accept any parameter.

Return Value: The function returns long data type represents unallocated size of the partition in bytes

Exception: This method throws SecurityException if the method does not allow file to be created

Below programs illustrates the use of getUsableSpace() function:

Example 1: The file “F:\\program.txt” is a existing file in F: Directory .

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// Java program to demonstrate
// getUsableSpace() method of File Class
  
import java.io.*;
  
public class solution {
    public static void main(String args[])
    {
  
        // Create an abstract pathname (File object)
        File f = new File("F:\\program.txt");
  
        // Display the Usable size of the partition
        // using the getUsableSpace() function
        System.out.println("Usable Space: "
                           + f.getUsableSpace());
    }
}

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Output:

Usable Space: 174491860992

Example 2: The file “F:\\program1.txt” does not exist file in F: Directory .

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// Java program to demonstrate
// getUsableSpace() method of File Class
  
import java.io.*;
  
public class solution {
    public static void main(String args[])
    {
  
        // Create an abstract pathname (File object)
        File f = new File("F:\\program1.txt");
  
        // Display the Usable size of the partition
        // using the getUsableSpace() function
        System.out.println("Usable Space: "
                           + f.getUsableSpace());
    }
}

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Output:

Usable Space: 0

Note: The programs might not run in an online IDE. Please use an offline IDE and set the path of the file.



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Second year Department of Information Technology Jadavpur University

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