Java Tutorial : Java IO (Java File - How to get free disk space) ~ foundjava

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FileDemo.java

import java.io.File;

public class FileDemo
{

    public static void main(String[] args)
    {
        File file = new File("c:");
        /*
         * Returns the size of the partition named by this
         * abstract pathname.
         */
        long totalSpace = file.getTotalSpace();
        /*
         * Returns the number of bytes available to this
         * virtual machine on the partition named by this
         * abstract pathname.
         */
        long usableSpace = file.getUsableSpace();
        /*
         * Returns the number of unallocated bytes in the
         * partition named by this abstract path name.
         */
        long freeSpace = file.getFreeSpace();

        System.out.println(" === bytes ===");
        System.out.println("Total size : " + totalSpace + " bytes");
        System.out.println("Space free : " + usableSpace + " bytes");
        System.out.println("Space free : " + freeSpace + " bytes");

        System.out.println(" === gigabyte ===");
        System.out.println("Total size : " + totalSpace / 1024 / 1024 / 1024 + " GB");
        System.out.println("Space free : " + usableSpace / 1024 / 1024 / 1024 + " GB");
        System.out.println("Space free : " + freeSpace / 1024 / 1024 /1024 + " GB");
    }

}

Output

 === bytes ===
Total size : 129926488064 bytes
Space free : 53480681472 bytes
Space free : 53480681472 bytes
 === gigabyte ===
Total size : 121 GB
Space free : 49 GB
Space free : 49 GB

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