Practice Exercises Java - Learn to program performing exercises with Java

Practice Exercises Java

Learn to program performing exercises with Java

12 Lessons Java with the Solutions - 228 Exercises Java with the solutions
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Encrypt a BMP file - Practice Exercises Java

Lesson 8:

File management

Exercise 8.29:

Encrypt a BMP file


Create a program to encrypt/decrypt a BMP image file, by changing the "BM" mark in the first two bytes with MB and vice versa.

Use the advanced FileStream constructor to allow simultaneous reading and writing.

Source Code:

package Bmp;
import java.util.*;

public class Main
	public static void main(String[] args)
		FileStream myFile;

		System.out.print("Enter the name of file: ");
		String fileName = new Scanner(;

		if (!(new
			System.out.println("The file not exists!!!");

			myFile = File.Open(fileName, FileMode.Open, FileAccess.ReadWrite);
            byte b1 = (byte)myFile.ReadByte();
			byte b2 = (byte)myFile.ReadByte();

			if (((char)b1 != 'B') || ((char)b2 != 'M'))
				System.out.println("This File is NOT a BMP file");
				myFile.Seek(0, SeekOrigin.Begin);
		catch (RuntimeException e)
			System.out.printf("Error: %1$s!!!" + "\r\n", e.message());
Exercisey 8.29

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