laba 3_3_java

import java.util.Scanner;
import java.io.*;
class SelectionSort {
    private static final Scanner scanner = new Scanner(System.in);
    static Scanner fileScanner;

    public static void main(String[] args) {
        int[] arr = input();
        arr = sortArrayBySelectionSort(arr);
        output(arr);
    }

    private static int inputData() {
        int n = 0;
        boolean isIncorrect;
        do {
            isIncorrect = false;
            try {
                n = Integer.parseInt(scanner.nextLine());
            } catch (Exception e) {
                isIncorrect = true;
                System.out.println("Please, enter a integer number:");
            }
        } while (isIncorrect);
        return n;
    }
    private static boolean choose() {
        int inputNumber;
        boolean isIncorrect;
        final int MIN_NUM = 0;
        final int MAX_NUM = 1;
        do {
            isIncorrect = false;
            inputNumber = inputData();
            if (inputNumber < MIN_NUM || inputNumber > MAX_NUM) {
                System.out.println("You are out of input range!:");
                isIncorrect = true;
            }
        } while (isIncorrect);
        if (inputNumber == 1)
            return true;
        else
            return false;
    }
    private static int inputArraySize() {
        boolean isIncorrect;
        final int MIN_SIZE = 2;
        int num;
        do {
            num = inputData();
            isIncorrect = false;
            if (num < MIN_SIZE) {
                System.out.println("Please, enter a number > 2:");
                isIncorrect = true;
            }
        } while (isIncorrect);
        return num;
    }
    private static int[] inputArray(int num) {
        int[] arr = new int[num];
        for (int i = 0; i < arr.length; i++)
            arr[i] = inputData();
        return arr;
    }
    private static int[] sortArrayBySelectionSort(int[] arr) {
        System.out.println("Sort stages:");
        int min;
        for (int i = 0; i < arr.length - 1; i++){
            for (int j = i + 1; j < arr.length; j++)
                if (arr[j] < arr[i]) {
                    min = arr[j];
                    arr[j] = arr[i];
                    arr[i] = min;
                }
            System.out.print("Stage " + (i + 1) + ": ");
            for (int j : arr) System.out.print(j + " ");
            System.out.println();
        }
        return arr;
    }
    private static void consoleOutput(int[] arr) {
        for (int j : arr) System.out.print(j + " ");
        System.out.println();
    }
    //files
    private static String inputFilePath() {
        String path;
        boolean isIncorrect;
        do {
            isIncorrect = false;
            System.out.println("Input file path:");
            path = scanner.nextLine();
            File file = new File(path);
            if (!file.exists()) {
                System.out.println("Wrong way to file.");
                isIncorrect = true;
            }
            if (!file.canRead() && file.exists()) {
                System.out.println("Impossible to read a file.");
                isIncorrect = true;
            }
            if (!file.canWrite() && file.canRead()) {
                System.out.println("Impossible to write a file.");
                isIncorrect = true;
            }
        } while (isIncorrect);
        return path;
    }
    private static int inputSizeOfArrayFromFile(String path) {
        int num = 0;
        boolean isIncorrect;
        final int MIN = 1;
        do {
            isIncorrect = false;
            try {
                fileScanner = new Scanner(new File(path));
                num = fileScanner.nextInt();
            } catch (Exception q) {
                isIncorrect = true;
                System.out.println("Check file");
                path = inputFilePath();
            }
            if (!isIncorrect && (num < MIN)) {
                isIncorrect = true;
                System.out.println("Matrix size should be at least 2");
            }
        } while (isIncorrect);
        return num;
    }
    private static int[]inputArrayFile(String path, int num) {
        boolean isIncorrect;
        int[] arr = new int[num];
        do {
            isIncorrect = false;
            try {
                fileScanner = new Scanner(new File(path));
                fileScanner.nextLine();
                for (int i = 0; (i < arr.length); i++) {
                    arr[i] = fileScanner.nextInt();

                }
            } catch (Exception q) {
                isIncorrect = true;
                System.out.println("Reading of array elements failed.");
                path = inputFilePath();
            }
        } while (isIncorrect);
        return arr;
    }
    private static void fileOutput(int[] arr, String path) {
        boolean isIncorrect;
        do {
            isIncorrect = false;
            try {
                FileWriter writer = new FileWriter(path);
                writer.write("Sorted array: \n");
                for (int j : arr) {
                    writer.write(j + " ");
                }
                writer.close();
            } catch (IOException e) {
                isIncorrect = true;
                System.out.println("Mistake of output in file. Input path.");
                path = inputFilePath();
            }
        } while(isIncorrect);
        System.out.println("Successful output in file.");
    }
    private static int[] input () {
        System.out.println("Selection sort. Demonstration.");
        System.out.println("Enter type of input: " + '\n' + "1 is console input, 0 is file input.");
        int num;
        int[] arr;
        String path;
        boolean chose = choose();
        if (chose) {
            System.out.println("Input size of array:");
            num = inputArraySize();
            System.out.println("Input array elements:");
            arr = inputArray(num);
            System.out.println("Unsorted array:");
            consoleOutput(arr);
        } else {
            path = inputFilePath();
            num = inputSizeOfArrayFromFile(path);
            arr = inputArrayFile(path, num);
        }
        return arr;
    }
    private static void output (int[] arr){
        System.out.println("Enter type of output: " + '\n' + "1 is console output, 0 is file output.");
        String path;
        boolean chose = choose();
        if (chose) {
            System.out.println("Sorted array:");
            consoleOutput(arr);
        } else {
            path = inputFilePath();
            fileOutput(arr, path);
        }
    }
}