FileHandlingActivity.java

import java.io.*;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

public class FileHandlingActivity {
    public static void debugFileOperation(){
        try {
        File file = new File("fileName.txt");
        
        FileWriter writer = new FileWriter(file);
        writer.write("Will this fail?");
        writer.close();
        } catch (IOException e) {
            System.out.println("An error occurred: " + e.getMessage());
            e.printStackTrace(); 
        }
    }
    public static void main(String[] args) throws IOException {        

        debugFileOperation();

        File dir = new File("Maine");
        dir.mkdir();

        File creditCard = new File(dir,"myCreditCard");
        creditCard.createNewFile();
        File SSN = new File(dir,"mySSN");
        SSN.createNewFile();
        File passwords = new File(dir,"myPasswords");
        passwords.createNewFile();

        FileWriter pencil = new FileWriter(creditCard);
        pencil.write("My credit card number is 15!");
        pencil.close();
        FileWriter pen = new FileWriter(SSN);
        pen.write("My SSN is 21!");
        pen.close();
        FileWriter sharpie = new FileWriter(passwords);
        sharpie.write("My password is 1234!");
        sharpie.close();
        
        String stolenCreditCard = "";
        FileReader readingGlasses = new FileReader(creditCard);
        while (readingGlasses.ready()){
            stolenCreditCard += (char)readingGlasses.read();
        }
        System.out.println(stolenCreditCard);
        readingGlasses.close();
        
        String stolenSSN = "";
        FileReader readingGoggles = new FileReader(SSN);
        while (readingGoggles.ready()){
            stolenSSN += (char)readingGoggles.read();
        }
        System.out.println(stolenSSN);
        readingGoggles.close();

        String stolenPasswords = "";
        FileReader readingSnorkel = new FileReader(passwords);
        while (readingSnorkel.ready()){
            stolenPasswords += (char)readingSnorkel.read();
        }
        System.out.println(stolenPasswords);
        readingSnorkel.close();
        
        File backupDir = new File("Pencilvania");
        backupDir.mkdir();
        
        
        File fraudulentCreditCard = new File(backupDir,"ourCreditCard");
        fraudulentCreditCard.createNewFile();

        String cardInfo = "";
        FileReader cardScanner = new FileReader(creditCard);
        while (cardScanner.ready()){
            cardInfo += (char)cardScanner.read();
        }
        cardScanner.close();
        FileWriter cardCopier = new FileWriter(fraudulentCreditCard);
        cardCopier.write(cardInfo);
        cardCopier.close();


        File fraudulentSSN = new File(backupDir,"ourSSN");
        fraudulentSSN.createNewFile();

        String SSNInfo = "";
        FileReader SSNScanner = new FileReader(SSN);
        while (SSNScanner.ready()){
            SSNInfo += (char)SSNScanner.read();
        }
        SSNScanner.close();
        FileWriter SSNCopier = new FileWriter(fraudulentSSN);
        SSNCopier.write(SSNInfo);
        SSNCopier.close();
       

        File fraudulentPassword = new File(backupDir,"ourPasswords");
        fraudulentPassword.createNewFile();

        String passwordInfo = "";
        FileReader passwordScanner = new FileReader(passwords);
        while (passwordScanner.ready()){
            passwordInfo += (char)passwordScanner.read();
        }
        passwordScanner.close();
        FileWriter passwordCopier = new FileWriter(fraudulentPassword);
        passwordCopier.write(passwordInfo);
        passwordCopier.close();

        System.out.println("dir:");
        for (File fill: dir.listFiles()){
            System.out.println(fill.getName());
        }

        System.out.println("backupDir:");
        for (File fill: backupDir.listFiles()){
            System.out.println(fill.getName());
        }
    }
}