package task2;

import java.util.ArrayList;
import java.util.List;

public class Test {
    public static void main(String[] args) {
        // task 2
        PasswordMaker PasswordGenerator = PasswordMaker.getInstance();
        String password = PasswordGenerator.getPassword("Mihai");
        PasswordMaker PasswordGenerator2 = PasswordMaker.getInstance();
        String password2 = PasswordGenerator2.getPassword("Alex");
        System.out.println(password + " " + password2);
        // task 4
        ArrayList<Integer> List = new ArrayList<>();
        List.add(1);
        List.add(2);
        List.add(3);
        List.add(4);
        System.out.println(List);
        MyImmutableArray Array = new MyImmutableArray(List);
        System.out.println(Array.getArray());
        List<Integer> immutableList = Array.getArray();
        // Atunci cand rulam programul, la aceasta linie primim eroare
        // deoarece lista este immutable si nu putem sa o schimbam
        immutableList.add(5);
        System.out.println(immutableList);
    }
}


package task2;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class MyImmutableArray {
    private ArrayList<Integer> immutableArray;

    public MyImmutableArray(ArrayList<Integer> immutableArray) {
        this.immutableArray = immutableArray;
    }

    public List<Integer> getArray () {
        return Collections.unmodifiableList(immutableArray);
    }
}

public MyImmutableArray(ArrayList<Integer> array) {
        immutableArray = new ArrayList<Integer>(array.size());
        for (Integer integer : array) {
            immutableArray.add(Integer.valueOf(integer));
        }
    }