import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

public class Collectionz {
  public static void main(String[] args) {

    // ArrayList

    ArrayList<Integer> arr = new ArrayList<>();
    arr.add(45);
    arr.add(63);
    arr.add(24);
    arr.add(65);
    arr.add(74);
    arr.add(22);
    arr.add(3, 100);

    System.out.println(arr);
    Collections.sort(arr);
    System.out.println(arr);
    System.out.println(arr.contains(43));

    // Hashset
    HashSet<String> hs = new HashSet<>();
    hs.add("Sami");
    hs.add("Leena");
    hs.add("Zakaria");
    hs.add("Mohammed");
    hs.add("Sara");
    hs.add("Chekalil");
    hs.add("Benmoulay");
    hs.add("doctor");
    hs.add("Engineer");

    System.out.println(hs);
    Iterator<String> it = hs.iterator();
    while (it.hasNext()) {
      System.out.println(it.next());
    }
    System.out.println("");
    System.out.println("");
    System.out.println("");

    // HashMap
    //
    HashMap<Integer, String> hm = new HashMap<>();
    hm.put(0, "Zakaria");
    hm.put(1, "Sara");
    hm.put(2, "Leena");
    hm.put(3, "Sami");
    System.out.println(hm);
    Set sm = hm.entrySet();
    Iterator it2 = sm.iterator();
    while (it2.hasNext()) {
      System.out.println(it2.next());
    }
  }
}