Get disk space in Java

File class in Java provides disk space information for the developer. The following class shows you how to use getTotalSpace(), getFreeSpace() and getUsableSpace() methods and write the space information to console:

DiskSpaceTutorial.java

package net.korri.tutorial.java.diskspace;
 
import java.io.File;
 
public class DiskSpaceTutorial {
 
  public static void main(String[] args) { 
    File directory = new File(".");
 
    long totalSpace = directory.getTotalSpace();
    long freeSpace = directory.getFreeSpace();
    long usableSpace = directory.getUsableSpace();
 
    System.out.println("# Disk space information for the current filesystem #");
    System.out.println("Total space:\t" + convertToString(totalSpace));
    System.out.println("Free space:\t" + convertToString(freeSpace));
    System.out.println("Usable space:\t" + convertToString(usableSpace));
  }
 
  private static String convertToString(long bytes) {
 
    String[] postfixes = { " B", " KB", " MB", " GB", " TB", " PB" };
 
    int i = 0;
    long value = bytes;
 
    while (value > 1024L && i < postfixes.length) {
      value = value / 1024L;
 
      if (i + 1 == postfixes.length) {
        break;
      }
 
      i++;
    }
 
    return value + postfixes[i];
  }
}

Output

# Disk space information for the current filesystem #
Total space: 110 GB
Free space: 45 GB
Usable space: 39 GB

Further reading

• File