Java Polia

import java.util.Arrays;
import java.util.List;
import java.util.Random;

public class Main {

    public static void main(String[] args) {

        Random mojaNahoda = new Random();

        // Triedenie poloziek pola - SORT
        // Primitivy - Quick sort
        // Rerencie - Merge sort
        /* QS nie je stabilny t.j. pre rovnake vstupy
         moze zmenit ich relativnu poziciu pocas triedenia
         Ak mame zoradene pole, ostane bezo zmeny
         Primitivy nemaju ziadnu identitu...
         https://www.youtube.com/watch?v=ywWBy6J5gz8

         MS nepouzivat pri primitivach (nie je garantovane n * log(n))
         Vyzaduje sa klonovanie pola. Pri referencnych typoch
         sa vyzadauje viac pamati.
         https://www.youtube.com/watch?v=XaqR3G_NVoo
         */
        System.out.println("Triedenie poloziek pola(int) - SORT:");
        int[] poleCisel = {4, 1, 2, 9, 8};
        System.out.println("0 prvok: " + poleCisel[0]);

        Arrays.sort(poleCisel);
        // Arrays.
        for (int i = 0; i < poleCisel.length; i++) {
            System.out.print(poleCisel[i] + " ");
        }

        System.out.println("\nTriedenie poloziek pola(String) - SORT:");
        String[] klienti = {"Xavier", "Adam", "Karol"};
        Arrays.sort(klienti);

        for (String s : klienti) {
            System.out.print(s + " ");
        }

        System.out.println("\n\nNaplnenie prazdneho pola cislom - FILL:");
        int[] tmp = new int[10];

        Arrays.fill(tmp, 1);

        for (int i = 0; i < tmp.length; i++) {
            System.out.print(tmp[i] + " ");
        }

        System.out.println("\nNaplnenie prazdneho pola cislom od konkretnej pozicie - FILL:");
        int[] pomocne = new int[10];
        Arrays.fill(pomocne, 5, 8, 2);

        for (int i = 0; i < pomocne.length; i++) {
            System.out.print(pomocne[i] + " ");
        }

        System.out.println("\nNaplnenie prazdneho pola nahodnym cislom - FILL:");
        for (int i = 0; i < pomocne.length; i++) {
            //pomocne[i] = (int) (Math.random() * 100);
            pomocne[i] = mojaNahoda.nextInt(100);
        }

        for (int i = 0; i < pomocne.length; i++) {
            System.out.print(pomocne[i] + " ");
        }

        System.out.println("\n\nPorovnanie 2 poli - EQUALS:");

        int[] policko1 = new int[4];
        int[] policko2 = new int[5];

        Arrays.fill(policko1, 1);
        Arrays.fill(policko2, 1);

        System.out.println("Su rovnake? -> " + Arrays.equals(policko1, policko2));

        System.out.println("\nKopirovanie pola - COPYOF:");
        int[] policko3 = Arrays.copyOf(policko1, 3);

        for (int i = 0; i < policko3.length; i++) {
            System.out.print(policko3[i] + " ");

        }

        System.out.println("\nKopirovanie casti pola - COPYOFRANGE:");

        Arrays.fill(policko1, 3);
        Arrays.fill(policko2, 4);

        policko3 = Arrays.copyOfRange(policko1, 2, 5);

        for (int i = 0; i < policko3.length; i++) {
            System.out.print(policko3[i] + " ");

        }

        //Arrays.
        System.out.println("\n\nZiskanie Hashu pola - HASHCODE:");

        System.out.println("Hash policko1: " + Arrays.hashCode(policko1));
        System.out.println("Hash policko3: " + Arrays.hashCode(policko2));

        System.out.println("\nKonvertovanie pola na zoznam - ASLIST:");
        List<String> mojZoznam = Arrays.asList("Adam", "Karol", "Fero");

        for (int i = 0; i < mojZoznam.size(); i++) {
            if (i == 0) {
                System.out.print("Vypisanie zoznamu (FOR): ");
            } else {
                System.out.print(mojZoznam.get(i) + " ");
            }
        }

        int i = 0;
        System.out.println("");
        for (String j : mojZoznam) {
            if (i == 0) {
                System.out.print("Vypisanie zoznamu (SHORT-FOR): ");
            } else {
                System.out.print(mojZoznam.get(i) + " ");
            }

            i++;
        }

        System.out.println("\nVypisanie zoznamu (priamo):" + mojZoznam);
        System.out.println("\nKonvertovanie pola na String - TOSTRING:");

        String pomocnyString = Arrays.toString(poleCisel);
        System.out.println(pomocnyString);

        System.out.println("\nVyhladanie prvku - BINARYSEARCH:");
        // Musis mat zoradene pole!!!

        System.out.println("Hladanie cislo 4 je na "
                + Arrays.binarySearch(poleCisel, 4) + " indexi.");

        System.out.println("Vyhladanie prvku od urcitej pozicie - BINARYSEARCH:");
        System.out.println("Hladanie cislo 8 je na "
                + Arrays.binarySearch(poleCisel, 1, 4, 8) + " indexi.");

        // Vynimky pre polia
        // ArrayIndexOutOfBoundsException / IndexOutOfBoundsException - index pola je vacsie nez jeho velkost, alebo zaporny
        // ArrayStoreException / RuntimeException - do pola nejake typu vlozene iny typ
        System.out.println("\nSpecialne metody beruce do uvahy aj viacnasobne pole ako argumenty "
                + "\n- DEEPEQUALS | DEEPHASHCODE | DEEPTOSTRING:");

        Arrays.deepEquals(args, args);
        Arrays.deepHashCode(args);
        Arrays.deepToString(args);

        String[][] menaKlientov = {{"Karol", "Fero"}, {"Laco", "Eva"}};

        System.out.println(Arrays.deepToString(menaKlientov));
        System.out.print("Klasicky toString():");
        System.out.println(Arrays.toString(menaKlientov));

    }

}