Dump - Practice Exercises Java

import java.util.*;
public class Main
{
	public static void main(String[] args)
	{
		java.io.FileInputStream file;
		final int SIZE_BUFFER = 16;

		String name = new Scanner(System.in).nextLine();

		try
		{
			file = File.OpenRead(name);
			byte[] data = new byte[SIZE_BUFFER];

			int amount;
			int c = 0;

			String line;
			do
			{
				System.out.print(ToHex(file.Position, 8));
				System.out.print("  ");


				amount = file.read(data, 0, SIZE_BUFFER);

				for (int i = 0; i < amount; i++)
				{
					System.out.print(ToHex(data[i], 2) + " ");

					if (data[i] < 32)
					{
						line += ".";
					}
					else
					{
						line += (char)data[i];
					}
				}


				if (amount < SIZE_BUFFER)
				{
					for (int i = amount; i < SIZE_BUFFER; i++)
					{
						System.out.print("   ");
					}
				}

				System.out.println(line);
				line = "";

				c++;
				if (c == 24)
				{
					new Scanner(System.in).nextLine();
					c = 0;
				}
			} while (amount == SIZE_BUFFER);

			file.close();
		}
		catch (RuntimeException e)
		{
			System.out.println("Error");
		}
	}

	public static String ToHex(int n, int digits)
	{
		String hex = String.valueOf(n, 16);
		while (hex.length() < digits)
		{
			hex = "0" + hex;
		}
		return hex;
	}
}