anoterCode

Collectionz.java

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+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());
+    }
+  }
+}