FileManipulator.java

package org.example;

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

public class FileManipulator {


    private final File file;
    String fileName;
    int number;

    public FileManipulator(String fileName, int number) {
        this.fileName = fileName;
        this.number = number;
        file = new File(this.fileName);
    }


    public void manipulate() {
        try {
            if (file.isFile()) {
                System.out.println("Dokumenti u gjet.");
                if (number == 0) {
                    throw new ArithmeticException();
                } else if (number > 10 || number < 0) {
                    throw new InputMismatchException();
                }
                int randNum = (int) (Math.random() * (number * 10));

                double result = (double) randNum / number;
                System.out.println("Numri i zgjedhur: " + number + " | Numri random: " + randNum);
                System.out.println("Po kryhet funksioni... \n...pjesetim i numrit random me numrin e zgjedhur...");
                System.out.println("Vlerat ne dokument: ");
                try (FileWriter writer = new FileWriter(file, true)) {
                    writer.append("Numer random ").append(String.valueOf(randNum)).append(" pjesetim me ").append(String.valueOf(number)).append(" eshte ").append(String.valueOf(result)).append("\n");
                }
                try (Scanner fileScanner = new Scanner(file)) {
                    while (fileScanner.hasNextLine()) {
                        System.out.println(fileScanner.nextLine());
                    }
                }
            } else {
                throw new FileNotFoundException();
            }

        } catch (FileNotFoundException fe) {
            System.out.println("Dokumenti nuk u gjet! " + fe);
        } catch (InputMismatchException i) {
            System.out.println("Input i pavlefshem!  Number duhet te jete pozitiv dhe/ose me i vogel se 10! " + i);
        } catch (ArithmeticException ae) {
            System.out.println("Pjesetim me 0! " + ae);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

}