laba3.3 (Java)

package com.company;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) throws IOException {
        System.out.println("The program sorts the array using the simple insertion method.");
        int source = chooseSource();
        double[] array = inputData(source);
        System.out.println("\nSource array:");
        printArray(array);
        doInsertionSort(array);
        System.out.println("\nFinal array:");
        printArray(array);
        outputData(source, array);
    }

    public static int chooseSource(){
        System.out.println("Choose where to enter data. Enter 1 or 2:\n 1.File\n 2.Console");
        Scanner scan = new Scanner(System.in);
        int choice = 0;
        boolean isIncorrect;
        do {
            isIncorrect = false;
            try {
                choice = Integer.parseInt(scan.nextLine());
            }catch (Exception e){
                System.out.println("Enter an integer!");
                isIncorrect = true;
            }
            if (!isIncorrect && choice != 1 && choice != 2){
                System.out.println("Enter 1 or 2!");
                isIncorrect = true;
            }
        }while (isIncorrect);
        return choice;
    }

    public static double[] inputData(int source) throws FileNotFoundException {
        double[] array = new double[0];
        int length;
        switch (source){
            case 1:
                System.out.println("Enter the absolute link to the input file");
                String pathInput = inputPath();
                length = inputLengthFromFile(pathInput);
                array = new double[length];
                inputArrayFromFile(array, pathInput);
                break;
            case 2:
                length = inputLengthFromConsole();
                array = new double[length];
                inputArrayFromConsole(array);
                break;
        }
        return array;
    }

    public static String inputPath(){
        Scanner scan = new Scanner(System.in);
        boolean isIncorrect;
        String path;
        do {
            isIncorrect = false;
            path = scan.nextLine();
            File file = new File(path);

            if (!file.exists()){
                System.out.println("File not found!\nEnter the absolute link to the file");
                isIncorrect = true;
            }
        }while (isIncorrect);
        System.out.println();
        return path;
    }

    public static int inputLengthFromFile(String path) throws FileNotFoundException {
        Scanner scan = new Scanner(new File(path));
        int length;
        boolean flag = true;
        System.out.println("The length of the array is read from file...");
        try {
            length = Integer.parseInt(scan.nextLine());
        } catch (Exception e) {
            System.out.println("The file has incorrect length!\nEnter the length from console");
            flag = false;
            length = inputLengthFromConsole();
        }
        if (flag && (length < 1 || length > 20)) {
            System.out.println("The file has incorrect length!\nEnter the length from console");
            length = inputLengthFromConsole();
        }
        return length;
    }

    public static void inputArrayFromFile(double[] array, String path) throws FileNotFoundException {
        Scanner scan = new Scanner(new File(path));
        scan.nextLine();
        System.out.println("The array is read from file...");
        try {
            for (int i = 0; i < array.length; i++) {
                array[i] = scan.nextDouble();
            }
        } catch (Exception e) {
            System.out.println("The file has incorrect data!\nEnter the array from console");
            inputArrayFromConsole(array);
        }
    }

    public static int inputLengthFromConsole() {
        Scanner scan = new Scanner(System.in);
        int length = 0;
        boolean isIncorrect;
        System.out.println("Enter the length of the array (from 1 to 20)");
        do {
            isIncorrect = false;
            try {
                length = Integer.parseInt(scan.nextLine());
            } catch (Exception e) {
                System.out.println("Incorrect input!\nEnter the integer");
                isIncorrect = true;
            }

            if (!isIncorrect && (length < 1 || length > 20)) {
                System.out.println("Incorrect input!\nEnter the length of the range from 1 to 20");
                isIncorrect = true;
            }
        } while (isIncorrect);
        return length;
    }

    public static void inputArrayFromConsole(double[] Array) {
        Scanner scan = new Scanner(System.in);
        boolean isIncorrect;

        for (int i = 0; i < Array.length; i++) {
            do {
                isIncorrect = false;
                System.out.println("Enter the array element at number " + (i + 1));
                try {
                    Array[i] = Double.parseDouble(scan.nextLine());
                } catch (Exception e) {
                    System.out.println("Incorrect input!\nEnter the number");
                    isIncorrect = true;
                }
            } while (isIncorrect);
        }
    }

    public static void printArray(double[] array) {
        for (double element : array) {
            System.out.print(element + "; ");
        }
        System.out.println("\n");
    }

    public static void doInsertionSort(double[] array){
        for (int i = 0; i < array.length; i++){
            double current = array[i];
            int j = i;
            while(j > 0 && current < array[j - 1]) {
                array[j] = array[j - 1];
                j--;
            }
            array[j] = current;
            viewIterations(array, i, current);
        }
    }

    public static void viewIterations(double[] array, int i, double current){
        System.out.println("Iteration " + (i + 1) + ":");
        System.out.println("Inserted element = " + current);
        System.out.println("Array:");
        printArray(array);
    }

    public static void outputData(int source, double[] array) throws IOException {
        if (source == 1) {
            System.out.println("\nEnter the absolute link to the output file");
            String pathOutput = inputPath();
            outputToFile(array, pathOutput);
        }
    }

    public static void outputToFile(double[] array, String path) throws IOException {
        FileWriter writer = new FileWriter(path);
        for (int i = 0; i < array.length; i++){
            writer.write(array[i] + "; ");
        }
        writer.close();
        System.out.println("The data is successfully recorded in the file");
    }
}