Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://www.tutorialspoint.com/java/io/file_getfreespace.htm below:

Java - File getFreeSpace() method

The Java File getFreeSpace() method returns the number of unallocated bytes in the partition named by this abstract path name. The returned number of unallocated bytes are not a guarantee. The count of unallocated bytes is likely to be accurate immediately after this call and inaccurate by any external I/O operations.

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

public long getFreeSpace()

NA

This method returns unallocated bytes on the partition.

• SecurityException − If a security manager exists and it denies RuntimePermission("getFileSystemAttributes") or its SecurityManager. checkRead(String) denies read access to the file name by this abstract pathname.

The following example shows the usage of Java File getFreeSpace() method. We've created a File reference. Then we're creating a File Object using F:/test.txt which is present in the provided location. Now using getFreeSpace() method, we're getting the unallocated 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 unallocated bytes
         v = f.getFreeSpace();
         
         // true if the file path exists
         bool = f.exists();
         
         // if file exists
         if(bool) {
         
            // prints
            System.out.print("number of unallocated bytes: "+v);
         }
         
      } catch(Exception e) {
         // if any error occurs
         e.printStackTrace();
      }
   }
}

Let us compile and run the above program, this will produce the following result(depends on system's free space)−

number of unallocated bytes: 163280998400

The following example shows the usage of Java File getFreeSpace() method. We've created a File reference. Then we're creating a File Object using C:/test.txt which is present in the provided location. Now using getFreeSpace() method, we're getting the unallocated 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 allocated bytes
         v = f.getFreeSpace();
         
         // true if the file path exists
         bool = f.exists();
         
         // if file exists
         if(bool) {
         
            // prints
            System.out.print("number of allocated bytes: "+v);
         }
         
      } catch(Exception e) {
         // if any error occurs
         e.printStackTrace();
      }
   }
}

Let us compile and run the above program, this will produce the following result(depends on system's free space)−

number of allocated bytes: 3958620160

package com.tutorialspoint;

import java.io.File;

public class FileDemo {
   public static void main(String[] args) {
      // Create a File object representing a directory or drive
      File file = new File("C:\\"); // Use "/" for Linux/macOS

      // Get free space in bytes
      long freeSpace = file.getFreeSpace();

      // Convert bytes to gigabytes for better readability
      double freeSpaceGB = freeSpace / (1024.0 * 1024 * 1024);

      // Print free space
      System.out.println("Free space available on drive: " + freeSpaceGB + " GB");
   }
}

Let us compile and run the above program, this will produce the following result (depends on system's free space)−

Free space available on drive: 120.5 GB

• Creating a File Object− The File object is initialized with "C:\\" (for Windows) or "/" (for Linux/macOS). It represents the root directory of the filesystem.

• Using getFreeSpace()− The method returns the free space in bytes. To make it more readable, the value is converted to gigabytes (GB).

• getFreeSpace() only returns free space available to the JVM on that specific partition.

• It can be useful for checking if enough space is available before writing large files.

java_io_file_methods.htm

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4