W5 - Ex. 11

import java.util.Scanner;

public class OneDimensionalMemory {

    private Scanner cin=new Scanner(System.in);

    private int[] a={1, 1, 2, 2, 3, 3, 4, 4, 5, 5};

    private int[] b=new int[10];

    private boolean ok=false;

    private void shuffle(int[] a) {

        int temp;

        for (int i=0; i<100; i++) {

            int r1=(int) (Math.random()*a.length);

            int r2=(int) (Math.random()*a.length);

            temp=a[r1];

            a[r1]=a[r2];

            a[r2]=temp;

        }

    }

    private int input() {

        int num;

        while (true) {

            try {

                num=Integer.parseInt(cin.nextLine())-1;

                if (num>=0 && num<10) {

                    break;

                } else {

                    System.out.print("The number has to be from 1 to 10. Try again: ");

                }

            } catch (Exception e) {

                System.out.print("The value you entered is not valid. Try again: ");

            }

        }

        return num;

    }

    private void printUserChoice(int[] a, int x, int y) {

        int k=0;

        System.out.print("[ ");

        for (int i=0; i<a.length; i++) {

            if ((i==x || i==y)) {

                System.out.print(a[i] + " ");

            } else if (a[i]==b[i]) {

                System.out.print(a[i] + " ");

            } else {

                System.out.print(". ");

            }

        }

        System.out.println("]");

        if (a[x]==a[y]) {

            System.out.println("Lucky!");

            k++;

            b[x]=a[x];

            b[y]=a[y];

        } else {

            System.out.println("Too bad, try again!");

        }

        if (k==5) {

            ok=true;

        }

    }

    private void run() {

        int x, y;

        shuffle(a);

        while (!ok) {

            System.out.print("Enter index one (1-10): "); x=input();

            System.out.print("Enter index two (1-10): "); y=input();

            while (x==y) {

                System.out.print("The second index can't be the same with the first one. Try again: ");

                y=input();

            }

            printUserChoice(a, x, y);

        }

        System.out.println("You found all the pairs. Nice!");

    }

    public static void main(String[] args) {

        new OneDimensionalMemory().run();

    }

}