How to get disk space information in Java?

DiskSpace.java

package com.javamultiplex.filehandling;

import java.io.File;
import java.io.IOException;
import java.util.InputMismatchException;
import java.util.Scanner;

/**
 * @author Rohit Agarwal
 * @category File Handling
 * @problem How to get disk space information in java?
 */
public class DiskSpace {
	public static void main(String[] args) throws IOException {
		Scanner input = null;
		try {
			input = new Scanner(System.in);
			System.out.println("Enter drive letter : ");
			char ch = input.next(".").charAt(0);
			File file = new File(ch + ":");
			// Finding total space.
			long totalSpace = file.getTotalSpace();
			// Finding free space.
			long freeSpace = file.getFreeSpace();
			// 1 KB = 1024 Byte, 1 MB = 1024 KB, 1 GB = 1024 MB, 1 TB = 1024 GB
			long totalSpaceInGB = totalSpace / (1024 * 1024 * 1024);
			long freeSpaceInGB = freeSpace / (1024 * 1024 * 1024);
			long usableSpaceInGB = totalSpaceInGB - freeSpaceInGB;
			System.out.println("Total Space : " + totalSpaceInGB + " GB");
			System.out.println("Free Space : " + freeSpaceInGB + " GB");
			System.out.println("Usable Space : " + usableSpaceInGB + " GB");
		} catch (InputMismatchException e) {
			System.out.println("Enter drive letter correctly!");
		} finally {
			if (input != null) {
				input.close();
			}
		}
	}
}