Exercises Java with Examples-
Practice Exercises Java 4,5 5 302940

File encrypter - Practice Exercises Java


Lesson 8:

File management


Exercise 8.19:

File encrypter


Objetive:

Create a program to encrypt a text file into another text file. It must include the encrypter class you have created previously (in January 17th)


Source Code:


import java.util.*;
public class Main
{
	public static void main(String[] args)
	{
		java.io.InputStreamReader inputFile;
		java.io.OutputStreamWriter outputFile;
		String line;
		String name;

		if (args.length < 1)
		{
			System.out.println("Not enough parameters!");
			System.out.println("Enter file name: ");
			name = new Scanner(System.in).nextLine();
		}
		else
		{
			name = args[0];
		}

		inputFile = File.OpenText(name);
		outputFile = File.CreateText(name + ".encrypted");

		do
		{

			line = inputFile.ReadLine();
			if (line != null)
			{
				String newText = Encrypter.Encrypt(line);
				outputFile.write(newText + System.lineSeparator());
			}

		} while (line != null);

		inputFile.close();
		outputFile.close();
	}
}

public class Encrypter
{
	public static String Encrypt(String originalString)
	{
		String result = "";

		for (char letter : originalString)
		{
			char newLetter = letter;
			newLetter++;
			result += newLetter;
		}
		return result;
	}

	public static String Decrypt(String originalString)
	{
		String result = "";

		for (char letter : originalString)
		{
			char newLetter = letter;
			newLetter--;
			result += newLetter;
		}
		return result;
	}
}
Exercisey 8.19

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